WO2018173265A1 - 有機エレクトロニクス材料、インク組成物、有機層、及び有機エレクトロニクス素子 - Google Patents
有機エレクトロニクス材料、インク組成物、有機層、及び有機エレクトロニクス素子 Download PDFInfo
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- WO2018173265A1 WO2018173265A1 PCT/JP2017/012068 JP2017012068W WO2018173265A1 WO 2018173265 A1 WO2018173265 A1 WO 2018173265A1 JP 2017012068 W JP2017012068 W JP 2017012068W WO 2018173265 A1 WO2018173265 A1 WO 2018173265A1
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G61/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
- C08G61/02—Macromolecular compounds containing only carbon atoms in the main chain of the macromolecule, e.g. polyxylylenes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/02—Polyamines
- C08G73/026—Wholly aromatic polyamines
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/10—Organic polymers or oligomers
- H10K85/111—Organic polymers or oligomers comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
- H10K85/113—Heteroaromatic compounds comprising sulfur or selene, e.g. polythiophene
- H10K85/1135—Polyethylene dioxythiophene [PEDOT]; Derivatives thereof
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- C08G61/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
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- C—CHEMISTRY; METALLURGY
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/0666—Polycondensates containing five-membered rings, condensed with other rings, with nitrogen atoms as the only ring hetero atoms
- C08G73/0672—Polycondensates containing five-membered rings, condensed with other rings, with nitrogen atoms as the only ring hetero atoms with only one nitrogen atom in the ring
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L65/00—Compositions of macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain; Compositions of derivatives of such polymers
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Definitions
- Embodiments of the present invention relate to an organic electronics material, an ink composition, an organic layer, an organic electronics element, an organic electroluminescence element (also referred to as “organic EL element”), a display element, a lighting device, and a display device.
- organic EL element organic electroluminescence element
- Organic EL elements are attracting attention as large-area solid-state light source applications, for example, as an alternative to incandescent lamps and gas-filled lamps. It is also attracting attention as the most powerful self-luminous display that can replace the liquid crystal display (LCD) in the flat panel display (FPD) field, and its commercialization is progressing.
- LCD liquid crystal display
- FPD flat panel display
- Organic EL elements are roughly classified into two types, ie, low molecular organic EL elements using low molecular compounds and high molecular organic EL elements using high molecular compounds, depending on the organic materials used.
- the manufacturing method of an organic EL element is a coating process in which film formation is performed mainly by a dry process in which film formation is performed in a vacuum system, plate printing such as relief printing and intaglio printing, and plateless printing such as inkjet. The process is roughly divided into two. Since simple film formation is possible, the coating process is expected as an indispensable method for future large-screen organic EL displays.
- WO 2010/140553 discloses an organic electronic material including a polymer or an oligomer having a structure branched in three directions.
- an object of an embodiment of the present invention to provide an organic electronic material and an ink composition that are suitable for a coating process and can form an organic layer having excellent solvent resistance. Another embodiment of the present invention is to provide an organic layer suitable for improving the characteristics of an organic electronic device. Another object of the present invention is to provide an organic electronics element, an organic EL element, a display element, a lighting device, and a display device having excellent characteristics.
- Embodiments of the present invention relate to an organic electronic material including a polymer or oligomer having a structural unit having a hole transporting property and having an alkyl chain having 6 to 20 carbon atoms.
- Another embodiment of the present invention relates to an ink composition
- an ink composition comprising the organic electronic material and a solvent.
- Another embodiment of the present invention relates to an organic layer formed using the organic electronic material or the ink composition.
- Another embodiment of the present invention relates to an organic electronic device comprising at least one organic layer.
- Other embodiment of this invention is related with an organic electroluminescent element provided with at least one said organic layer.
- Other embodiment of this invention is related with the display element provided with the said organic electroluminescent element.
- Other embodiment of this invention is related with the illuminating device provided with the said organic electroluminescent element.
- Other embodiment of this invention is related with the display apparatus provided with the said illuminating device and the liquid crystal element as a display means.
- an organic electronic material and an ink composition that are suitable for a coating process and can form an organic layer having excellent solvent resistance.
- the organic layer suitable for the improvement of the characteristic of an organic electronics element can be provided.
- an organic electronics element, an organic EL element, a display element, a lighting device, and a display device having excellent characteristics can be provided.
- An organic electronic material according to an embodiment of the present invention is a polymer or oligomer having a structural unit having a hole transporting property and having an alkyl chain having 6 to 20 carbon atoms (hereinafter referred to as “polymer (A)”). In some cases).
- the organic electronic material may contain other components such as an initiator and a solvent as necessary.
- the organic electronic material may contain 1 type of polymers (A), or may contain 2 or more types.
- the components that may optionally be included such as an initiator and a solvent may be included alone or in combination with each other.
- the solvent resistance can be improved by using a polymer or oligomer having a polymerizable functional group that causes a crosslinking reaction.
- the solvent resistance tends to improve as the amount of the polymerizable functional group in the polymer or oligomer increases.
- a polymer or oligomer having a polymerizable functional group when used, when the organic EL device is driven, an uncrosslinked polymerizable functional group or a structure bonded by crosslinking is one of the factors that degrade the organic EL device characteristics. There was a case that could become one.
- the organic electronic material of the present embodiment is suitable for application to an ink composition for a coating process.
- the organic EL element using this organic layer can improve the light emission characteristics and improve the light emission efficiency. It has been found that effects such as improvement and improvement in light emission lifetime can be obtained.
- the polymer (A) having an alkyl chain having 6 to 20 carbon atoms is used, the light emission efficiency and the light emission lifetime can be improved.
- the polymer (A) has a structural unit having a hole transporting property and has an alkyl chain having 6 to 20 carbon atoms.
- the polymer (A) may be a linear polymer or a polymer having a branched structure in the molecule and having three or more terminals.
- a branched structure refers to a structure in which a polymer chain has a branched portion and has structural units in three or more directions from the branched portion.
- the polymer (A) having a branched structure and having three or more terminals is composed of a main chain and a side chain.
- an aryl group is an atomic group obtained by removing one hydrogen atom from an aromatic hydrocarbon.
- a heteroaryl group is an atomic group obtained by removing one hydrogen atom from an aromatic heterocyclic ring.
- An arylene group is an atomic group obtained by removing two hydrogen atoms from an aromatic hydrocarbon.
- a heteroarylene group is an atomic group obtained by removing two hydrogen atoms from an aromatic heterocycle.
- the arenetriyl group is an atomic group obtained by removing three hydrogen atoms from an aromatic hydrocarbon.
- the heteroarene triyl group is an atomic group obtained by removing three hydrogen atoms from an aromatic heterocyclic ring.
- Examples of the aromatic hydrocarbon include a single ring, a condensed ring, or a polycycle in which two or more selected from a single ring and a condensed ring are bonded via a single bond.
- Examples of the aromatic heterocycle include a single ring, a condensed ring, or a polycycle in which two or more selected from a monocycle and a condensed ring are bonded via a single bond.
- the aromatic hydrocarbon include benzene, biphenyl, terphenyl, triphenylbenzene, naphthalene, anthracene, tetracene, fluorene, phenanthrene, and the like.
- aromatic heterocycle examples include pyridine, pyrazine, quinoline, isoquinoline, acridine, phenanthroline, furan, pyrrole, thiophene, carbazole, oxazole, oxadiazole, thiadiazole, triazole, benzoxazole, benzoxiadiazole, benzothiadiazole, Examples include benzotriazole and benzothiophene.
- a structural unit having a hole transporting property it is only necessary to have the ability to transport holes, for example, a structural unit including an aromatic amine structure, a structural unit including a carbazole structure, a structural unit including a thiophene structure, Examples include a structural unit containing a fluorene structure and a structural unit containing a furan structure.
- a structural unit containing an aromatic amine structure and a structural unit containing a carbazole structure are preferred.
- the aromatic amine structure a tertiary aromatic amine structure is preferable, and a triarylamine structure (tertiary aromatic hydrocarbon structure) is more preferable.
- the number of carbon atoms of the aryl group is preferably 6 to 14, more preferably 6 to 10, and still more preferably 6.
- a triphenylamine structure is particularly preferable from the viewpoint of obtaining excellent charge transportability.
- the aromatic amine structure, carbazole structure, thiophene structure, fluorene structure, and furan structure may be unsubstituted or may have a substituent.
- Examples of the substituent include the same groups as E in formulas (1a) to (84a) described later.
- Examples of the substituent include an alkyl chain having 6 to 20 carbon atoms.
- the polymer (A) may have two or more structural units having these hole transport properties.
- the polymer (A) preferably has an alkyl chain having 6 to 20 carbon atoms in at least one of the structural units having a hole transporting property.
- the polymer (A) may be a polymer of a monomer including a structural unit having a hole transporting property, and includes a plurality of structural units having a hole transporting property, and / or one or more other structural units. It may be a copolymer.
- the copolymer may be an alternating, random, block or graft copolymer, or a copolymer having an intermediate structure thereof, for example, a random copolymer having a block property.
- Formulas (1a) to (93a) which are examples of structural units having a hole transport property are listed below.
- the structural units represented by the formulas (85a) to (93a) have a branched portion.
- each E independently represents —R 1 , —OR 2 , —SR 3 , —OCOR 4 , —COOR 5 , —SiR 6 R 7 R 8 , and the following formula (a ) To (c).
- R 1 to R 11 represent a hydrogen atom, a linear, cyclic or branched alkyl group having 1 to 22 carbon atoms, or an aryl group or heteroaryl group having 2 to 30 carbon atoms, and a, b and c are 1 represents an integer of 1 or more.
- the aryl group may have a substituent
- the heteroaryl group may have a substituent.
- substituents examples include alkyl group, alkoxy group, alkylthio group, aryl group, aryloxy group, arylthio group, arylalkyl group, arylalkoxy group, arylalkylthio group, arylalkenyl group, arylalkynyl group, hydroxyl group, hydroxyalkyl Group, amino group, substituted amino group, silyl group, substituted silyl group, silyloxy group, substituted silyloxy group, halogen atom, acyl group, acyloxy group, imino group, amide group (-(NH) -COR), imide group (- N (COR) 2 ), carboxyl group, substituted carboxyl group, cyano group, monovalent heterocyclic group and the like.
- A, b and c preferably represent an integer of 1 to 4.
- examples of the alkyl group include methyl group, ethyl group, n-propyl group, n-butyl group, n-pentyl group, n-hexyl group, n-heptyl group, n-octyl group, n-nonyl group, n -Decyl group, n-undecyl group, n-dodecyl group, isopropyl group, isobutyl group, sec-butyl group, tert-butyl group, 2-ethylhexyl group, 3,7-dimethyloctyl group, cyclohexyl group, cycloheptyl group, A cyclooctyl group etc.
- aryl group examples include phenyl, biphenyl-yl, terphenyl-yl, naphthalen-yl, anthracen-yl, tetracene-yl, fluoren-yl, phenanthrene-yl and the like.
- Heteroaryl groups include pyridyl-yl, pyrazin-yl, quinolin-yl, isoquinolin-yl, acridine-yl, phenanthroline-yl, furan-yl, pyrrol-yl, thiophen-yl, carbazol-yl, oxazol-yl, Examples include oxadiazol-yl, thiadiazol-yl, triazol-yl, benzoxazol-yl, benzooxadiazol-yl, benzothiadiazol-yl, benzotriazol-yl, benzothiophene-yl and the like. In the following, examples similar to these can be used as the alkyl group, aryl group, and heteroaryl group.
- Ar represents each independently an arylene group or heteroarylene group having 2 to 30 carbon atoms, or an aryl group or heteroaryl group having 2 to 30 carbon atoms.
- the arylene group, heteroarylene group, aryl group and heteroaryl group each may have a substituent. Examples of the substituent here include the same groups as those described above for E.
- Arylene groups include phenylene, biphenyl-diyl, terphenyl-diyl, naphthalene-diyl, anthracene-diyl, tetracene-diyl, fluorene-diyl, phenanthrene-diyl and the like.
- heteroarylene groups include pyridine-diyl, pyrazine-diyl, quinoline-diyl, isoquinoline-diyl, acridine-diyl, phenanthroline-diyl, furan-diyl, pyrrole-diyl, thiophene-diyl, carbazole-diyl, oxazole- Examples include diyl, oxadiazole-diyl, thiadiazole-diyl, triazole-diyl, benzoxazole-diyl, benzooxadiazole-diyl, benzothiadiazole-diyl, benzotriazole-diyl, and benzothiophene-diyl. In the following, examples similar to these can be used as the arylene group (arenediyl group) and the heteroarylene group (heteroarenediyl group).
- X and Z are each independently a divalent linking group, and there is no particular limitation. However, a group in which one hydrogen atom is further removed from a group having one or more hydrogen atoms in E, or the following linking group: The groups exemplified in the group (A) are preferred. x represents an integer of 0-2. Y is a trivalent linking group, and is not particularly limited. However, a group obtained by further removing two hydrogen atoms from a group having two or more hydrogen atoms in E is preferable.
- each R independently represents a hydrogen atom, an optionally substituted linear, cyclic or branched alkyl group having 1 to 22 carbon atoms, or an optionally substituted carbon number.
- each Ar independently represents an arylene group or heteroarylene group having 2 to 30 carbon atoms, or an aryl group or heteroaryl group having 2 to 30 carbon atoms.
- Y represents a divalent linking group.
- the units represented by formulas (85a) to (93a) may have a substituent, and examples of the substituent include the same groups as E in formulas (1a) to (84a).
- Y in the formulas (89a) and (93a) is preferably a divalent linking group represented by the following formula.
- each R independently represents a hydrogen atom, an optionally substituted linear, cyclic or branched alkyl group having 1 to 22 carbon atoms, or an optionally substituted carbon number. Represents 2 to 30 aryl groups or heteroaryl groups;
- Examples of the formulas (85a) and (86a) include the following formulas (85a-1) and (86a-1). In the following, only examples of formulas (85a) and (86a) are shown, but as examples of formulas (87a) to (89a) and (91a) to (93a), Ar has a substituent. Examples of the unit may be a benzene ring.
- each R independently represents a hydrogen atom, a halogen atom, or a monovalent organic group.
- the monovalent organic group represented by R include a linear, cyclic or branched alkyl group having 1 to 22 carbon atoms, or an aryl group or heteroaryl group having 2 to 30 carbon atoms. May have a group bonded through an ether bond.
- the polymer (A) is represented by the above-described arylene group or heteroarylene group, or the following formulas (1) to (32), in addition to the above structural unit, in order to adjust the solubility, heat resistance, or electrical characteristics.
- a copolymer having a structure as a copolymer structural unit may be used.
- the structural units represented by the formulas (30) to (32) have a branched portion.
- examples of R include the same groups as E in formulas (1a) to (84a).
- R 1 and R 2 are each independently selected from the group consisting of hydrogen and substituents consisting of C, H and / or X (where X is a heteroatom), Ar 1 and Ar 2 is independently a group selected from the group consisting of a divalent aromatic ring consisting of C and H, and a divalent aromatic ring consisting of C, H and X (X is a heteroatom). is there. Note that R 1 and R 2 are not simultaneously hydrogen. C is a carbon atom and H is a hydrogen atom. Examples of X include O (oxygen atom), N (nitrogen atom), S (sulfur atom), Si (silicon atom), halogen atom, and the like.
- R 1 and R 2 have a substituent composed of C, H and / or X, an aliphatic substituent composed of C and H, an aromatic substituent composed of C and H, an aromatic composed of C, H and X Substituents, substituents composed of C, H and / or X (including aliphatic substituents) other than these can be mentioned.
- the divalent aromatic ring composed of C and H in Ar 1 and Ar 2 is a divalent aromatic ring such as a single ring or a condensed ring formed by condensing 2 or more, preferably 2 to 5 rings. Group hydrocarbon ring.
- Examples of the divalent aromatic ring composed of C, H and X include a heteromonocyclic ring or a condensed ring formed by condensing 2 or more, preferably 2 to 5 rings.
- a bivalent heteroaromatic ring is mentioned.
- the groups Ar 1 and Ar 2 may have a substituent.
- R 1 and R 2 include the same groups as E in formulas (1a) to (84a).
- Ar 1 and Ar 2 include the same groups as Ar in formulas (1a) to (84a).
- W represents a trivalent linking group, and is preferably an atomic group obtained by further removing one hydrogen atom from an arylene group or heteroarylene group having 2 to 30 carbon atoms.
- Ar independently represents an arylene group or heteroarylene group having 2 to 30 carbon atoms, and Z represents any of a carbon atom, a silicon atom, or a phosphorus atom.
- the units represented by formulas (30) to (32) may have a substituent, and examples of the substituent include the same groups as E in formulas (1a) to (84a).
- the polymer (A) preferably has an alkyl chain having 6 to 20 carbon atoms.
- the polymer (A) may have an alkyl chain having 6 to 20 carbon atoms as a substituent of the structural unit constituting the main chain or side chain.
- the structural unit constituting the main chain or the side chain may be, for example, a structural unit represented by the above formulas (1a) to (93a) and formulas (1) to (32).
- the alkyl chain having 6 to 20 carbon atoms is a linear alkyl group having 6 to 20 carbon atoms.
- the carbon number of the alkyl chain having 6 to 20 carbon atoms is more preferably 7 to 18, more preferably 7 to 16, and still more preferably 8 to 12.
- Examples of the alkyl chain having 6 to 20 carbon atoms include n-hexyl group, n-heptyl group, n-octyl group, n-nonyl group, n-decyl group, n-undecyl group, n-dodecyl group, n- Examples include tridecyl group, n-tetradecyl group, n-pentadecyl group, n-hexadecyl group, n-heptadecyl group, n-octadecyl group, n-nonadecyl group and n-icosyl group.
- the polymer (A) includes, for example, an aryl group, heteroaryl group, arylene group, heteroarylene group, arenetriyl group, or heteroarenetriyl group having an alkyl chain having 6 to 20 carbon atoms as a substituent. And polymers having at least one selected from the group.
- Examples of the arenetriyl group include benzene-triyl, biphenyl-triyl, terphenyl-triyl, naphthalene-triyl, anthracene-triyl, tetracene-triyl, fluorene-triyl, phenanthrene-triyl and the like.
- heteroarene triyl group examples include pyridine-triyl, pyrazine-triyl, quinoline-triyl, isoquinoline-triyl, acridine-triyl, phenanthroline-triyl, furan-triyl, pyrrole-triyl, thiophene-triyl, carbazole-triyl, Examples include oxazole-triyl, oxadiazole-triyl, thiadiazole-triyl, triazole-triyl, benzoxazole-triyl, benzooxadiazole-triyl, benzothiadiazole-triyl, benzotriazole-triyl, and benzothiophene-triyl. In the following, examples similar to these can be used as the arenetriyl group and the heteroarenetriyl group.
- Examples of the polymer (A) include a polymer having a structure represented by the following formula (Ia).
- R 1 to R 5 in the formula (Ia) each independently represents a hydrogen atom or an alkyl group.
- the alkyl group represented by R 1 to R 5 include straight-chain alkyl groups having 6 to 20 carbon atoms (more preferably 7 to 18 carbon atoms, still more preferably 7 to 16 carbon atoms, and still more preferably 8 to 12 carbon atoms). preferable.
- At least one of R 1 to R 5 is a linear alkyl group having 6 to 20 carbon atoms (preferably 7 to 18 carbon atoms, more preferably 7 to 16 carbon atoms, and still more preferably 8 to 12 carbon atoms). * Or indicates a binding site with another structure.
- Formula (Ia) is a bonding site * with another structure, and may be bonded to, for example, an arylene group, heteroarylene group, arenetriyl, heteroarenetriyl group, a nitrogen atom, or the like.
- the structure of the formula (Ia) may be bonded to a nitrogen atom at the binding site * and form an aromatic amine structure such as a triarylamine structure together with another structure bonded to the nitrogen atom.
- polymers (A) examples include polymers having structures represented by the following formulas (IIa) to (IIIa).
- R 1 to R 5 in formula (IIa) each independently represent a hydrogen atom or an alkyl group.
- the alkyl group represented by R 1 to R 5 include straight-chain alkyl groups having 6 to 20 carbon atoms (more preferably 7 to 18 carbon atoms, still more preferably 7 to 16 carbon atoms, and still more preferably 8 to 12 carbon atoms). preferable.
- At least one of R 1 to R 5 is a linear alkyl group having 6 to 20 carbon atoms (more preferably 7 to 18 carbon atoms, still more preferably 7 to 16 carbon atoms, still more preferably 8 to 12 carbon atoms).
- Ar a represents an arylene group or a heteroarylene group. “*” Represents a binding site with another structure.
- R 1 to R 5 in formula (IIIa) each independently represent a hydrogen atom or an alkyl group.
- the alkyl group represented by R 1 to R 5 include straight-chain alkyl groups having 6 to 20 carbon atoms (more preferably 7 to 18 carbon atoms, still more preferably 7 to 16 carbon atoms, and still more preferably 8 to 12 carbon atoms). preferable.
- At least one of R 1 to R 5 is a linear alkyl group having 6 to 20 carbon atoms (more preferably 7 to 18 carbon atoms, still more preferably 7 to 16 carbon atoms, still more preferably 8 to 12 carbon atoms).
- Ar b represents an arenetriyl group or a heteroarenetriyl group. “*” Represents a binding site with another structure.
- Ar a represents, for example, an arylene group having 2 to 30 carbon atoms or a heteroarylene group.
- the arylene group may have a substituent
- the heteroarylene may have a substituent.
- Examples of the substituent include the same groups as E in formulas (1a) to (84a).
- Ar b represents, for example, an arenetriyl group having 2 to 30 carbon atoms or a heteroarenetriyl group.
- the arenetriyl group may have a substituent
- the heteroarenetriyl group may have a substituent.
- Examples of the substituent include the same groups as E in formulas (1a) to (84a).
- Ar a and Ar b are specifically, for example, Ar in formulas (1a) to (93a), a carbazole structure, a thiophene structure; a benzene ring in formulas (85a-1) and (86a-1); Arylene group and heteroarylene group in (1) to (28); Ar 1 and Ar 2 in formula (29); W in formula (30); fluorene structure in formula (31); in formula (32) Ar may be used.
- R 1 to R 6 in formulas (IV-1) to (IV-8) each independently represent a hydrogen atom or an alkyl group.
- the alkyl group represented by R 1 to R 8 is a linear alkyl group having 6 to 20 carbon atoms (more preferably 7 to 18 carbon atoms, still more preferably 7 to 16 carbon atoms, and still more preferably 8 to 12 carbon atoms). preferable.
- At least one of R 1 to R 6 of formula (IV-4) and (IV-5), at least one of R 1 to R 5 of formula (IV-1) and (IV-2), formula (IV At least one of R 1 to R 4 of ⁇ 6) to (IV-8) and at least one of R 1 and R 2 of formula (IV-3) have 6 to 20 carbon atoms (preferably 7 carbon atoms).
- a linear alkyl group having from 18 to 18, more preferably from 7 to 16 carbon atoms, and still more preferably from 8 to 12 carbon atoms.
- “*” Represents a binding site with another structure.
- the polymer (A) may contain a structural unit having an alkyl chain having 6 to 20 carbon atoms as a substituent.
- a structural unit having an alkyl chain having 6 to 20 carbon atoms as a substituent specifically, for example, any one or more of Ar is represented by an alkyl chain having 6 to 20 carbon atoms or the formula (Ia) A unit represented by the formulas (1a) to (93a) having a group as a substituent; any one or more of E is an alkyl chain having 6 to 20 carbon atoms or a group represented by the formula (Ia) ( Units represented by formulas (15a) to (84a); any one or more of R are represented by formulas (1) to (28), which is an alkyl chain having 6 to 20 carbon atoms or a structure represented by formula (Ia) A unit represented by formula (29) in which Ar 1 and / or Ar 2 has an alkyl chain
- the polymer (A) preferably has an alkyl chain having 6 to 20 carbon atoms in a structural unit other than the terminal from the viewpoints of improving characteristics and improving solvent resistance.
- the polymer (A) preferably has an alkyl chain having 6 to 20 carbon atoms in a divalent structural unit described later.
- the polymer (A) preferably contains a divalent structural unit having an alkyl chain having 6 to 20 carbon atoms as a structural unit having a hole transporting property.
- the polymer (A) has a branched structure and has three or more terminals. That the polymer (A) has a branched structure is preferable from the viewpoints of increasing the weight average molecular weight, increasing the glass transition temperature, and contributing to improvement in heat resistance.
- a divalent structural unit and a trivalent or higher structural unit for example, those represented by the formulas (85a) to (93a) and the formulas (30) to (32)), which will be described later, are included.
- a divalent structural unit having an alkyl chain having 6 to 20 carbon atoms The polymer (A) having a C 6-20 alkyl chain in a divalent structural unit can be obtained, for example, by using a monomer corresponding to the above specific structural example as a monomer used for synthesis.
- the polymer (A) may be linear or have a branched structure.
- the polymer (A) preferably includes at least a divalent structural unit L having a charge transport property and a monovalent structural unit T constituting a terminal portion, and a trivalent or higher structural unit B constituting a branched portion. Further, it may be included.
- the polymer (A) may contain only one type of each structural unit, or may contain a plurality of types. In the polymer (A), each structural unit is bonded to each other at a binding site of “monovalent” to “trivalent or higher”.
- the monovalent structural unit may be referred to as “structural unit T”
- the divalent structural unit may be referred to as “structural unit L”
- the trivalent or higher structural unit may be referred to as “structural unit B”.
- the structural unit L and / or the structural unit B is preferably a structural unit having a hole transporting property, and includes a structural unit including an aromatic amine structure, a structural unit including a carbazole structure, and a thiophene structure.
- At least one selected from the group consisting of a structural unit containing, a structural unit containing a fluorene structure, and a structural unit containing a furan structure, a structural unit containing an aromatic amine structure and a structural unit containing a carbazole structure More preferably, at least one selected from the group consisting of:
- the aromatic amine structure, carbazole structure, thiophene structure, fluorene structure, and furan structure may be unsubstituted or may have a substituent.
- the alkyl chain having 6 to 20 carbon atoms may be contained in any one of the structural units L, B, and T, but is more preferably contained in any one or more of the structural units L and / or B.
- the alkyl chain having 6 to 20 carbon atoms is contained in any one or more of the structural units L and / or B having hole transportability, and at least the structural unit L having hole transportability. It is more preferable that it is contained in.
- the polymer (A) may be, for example, one having no thienyl group which is unsubstituted or substituted with an alkyl group having 1 to 8 carbon atoms at the terminal, and is unsubstituted or has 1 to 10 carbon atoms at the terminal. It may not have a thienyl group substituted with an alkyl group and may not have a thienyl group which is unsubstituted or substituted with an alkyl group having 1 to 22 carbon atoms at the end, or The terminal may not have a thienyl group which may have a substituent.
- the polymer (A) may have no thienyl group which may have a substituent (for example, an alkyl group having 1 to 8, 1 to 10, or 1 to 22 carbon atoms), for example.
- Examples of the partial structure contained in the polymer (A) include the following.
- the polymer is not limited to one having the following partial structure.
- L represents the structural unit L
- B represents the structural unit B
- T represents the structural unit T.
- * In the formula represents a binding site with another structural unit.
- a plurality of L may be the same structural unit or different structural units. The same applies to B and T. *
- the structural unit L is a divalent structural unit having charge transportability.
- the structural unit L is a substituted or unsubstituted aromatic amine structure, carbazole structure, thiophene structure, fluorene structure, benzene structure, biphenyl structure, terphenyl structure, naphthalene structure, anthracene structure, tetracene structure, phenanthrene structure, dihydro Phenanthrene structure, pyridine structure, pyrazine structure, quinoline structure, isoquinoline structure, quinoxaline structure, acridine structure, diazaphenanthrene structure, furan structure, pyrrole structure, oxazole structure, oxadiazole structure, thiazole structure, thiadiazole structure, triazole structure, benzo Thiophene structure, benzoxazole structure, benzooxadiazole structure, benzothiazole structure, benzothiadiazole structure, benzotriazole structure, oxadiazol
- the structural unit L is a substituted or unsubstituted aromatic amine structure, carbazole structure, thiophene structure, fluorene structure, furan structure, benzene structure, pyrrole structure, from the viewpoint of obtaining excellent hole transport properties. And a structure containing one or more of these, preferably selected from a substituted or unsubstituted aromatic amine structure, carbazole structure, and a structure containing one or more of these. More preferably.
- the structural unit L is a substituted or unsubstituted fluorene structure, benzene structure, phenanthrene structure, pyridine structure, quinoline structure, and one or two of these. It is preferably selected from structures containing more than one species.
- the structural unit L preferably has a hole transporting property.
- structural unit L includes the following.
- the structural unit L is not limited to the following.
- Each R independently represents a hydrogen atom or a substituent.
- each R independently represents —R 1 , —OR 2 , —SR 3 , —OCOR 4 , —COOR 5 , —SiR 6 R 7 R 8 , a halogen atom, and a polymerizable functional group described later. Selected from the group consisting of containing groups.
- R 1 to R 8 each independently represents a hydrogen atom; a linear, cyclic or branched alkyl group having 1 to 22 carbon atoms; or an aryl group or heteroaryl group having 2 to 30 carbon atoms.
- the alkyl group may be further substituted with an aryl group or heteroaryl group having 2 to 20 carbon atoms, and the aryl group or heteroaryl group may be further linear, cyclic or branched having 1 to 22 carbon atoms. It may be substituted with an alkyl group.
- R is preferably a hydrogen atom, an alkyl group, an aryl group, or an alkyl-substituted aryl group.
- Ar represents an arylene group or heteroarylene group having 2 to 30 carbon atoms.
- Ar is preferably an arylene group, more preferably a phenylene group.
- the structural unit L having an alkyl chain having 6 to 20 carbon atoms at least one of R among the above is an alkyl chain having 6 to 20 carbon atoms or a structure represented by the formula (Ia) The thing which is is mentioned.
- the structural unit L include those represented by the above formulas (1a) to (84a) and (1) to (29).
- the structural unit T is a monovalent structural unit constituting the terminal portion of the polymer (A).
- the structural unit T is not particularly limited, and is selected from, for example, a substituted or unsubstituted aromatic hydrocarbon structure, aromatic heterocyclic structure, and a structure including one or more of these.
- the aromatic heterocyclic structure a structure other than the thiophene structure is preferable.
- the structural unit T is preferably a substituted or unsubstituted aromatic hydrocarbon structure from the viewpoint of imparting durability without deteriorating charge transportability, and is preferably a substituted or unsubstituted benzene structure. A structure is more preferable.
- the structural unit T when the polymer (A) has a polymerizable functional group at the terminal portion, the structural unit T has a polymerizable structure (for example, a polymerizable functional group such as a pyrrol-yl group). ).
- the structural unit T may have the same structure as the structural unit L or may have a different structure.
- structural unit T includes the following.
- the structural unit T is not limited to the following.
- R is the same as R in the structural unit L.
- Examples of the structural unit T in the case where the structural unit T has an alkyl chain having 6 to 20 carbon atoms include those in which at least one of R is an alkyl chain having 6 to 20 carbon atoms.
- the polymer (A) has a polymerizable functional group described below at the terminal portion, preferably at least one of R is a group containing a polymerizable functional group.
- the structural unit B is a trivalent or higher valent structural unit constituting a branched portion when the polymer (A) has a branched structure.
- the structural unit B is preferably hexavalent or less, more preferably trivalent or tetravalent, from the viewpoint of improving the durability of the organic electronic element.
- the structural unit B is preferably a unit having a charge transporting property, and more preferably has a hole transporting property.
- the structural unit B may be selected from, for example, a substituted or unsubstituted aromatic amine structure, carbazole structure, thiophene structure, fluorene structure, furan structure, and a structure containing one or more of these.
- the structural unit B is a substituted or unsubstituted aromatic amine structure, carbazole structure, condensed polycyclic aromatic hydrocarbon structure, and one or two of these from the viewpoint of improving the durability of the organic electronic device. Selected from structures containing more than one species.
- the structural unit B may have the same structure as the structural unit L or may have a different structure, may have the same structure as the structural unit T, or may have a different structure. You may have.
- structural unit B includes the following.
- the structural unit B is not limited to the following.
- W represents a trivalent linking group, for example, an arenetriyl group or a heteroarenetriyl group having 2 to 30 carbon atoms.
- the arenetriyl group is an atomic group obtained by removing three hydrogen atoms from an aromatic hydrocarbon.
- the heteroarene triyl group is an atomic group obtained by removing three hydrogen atoms from an aromatic heterocyclic ring.
- Ar each independently represents a divalent linking group, for example, each independently represents an arylene group or heteroarylene group having 2 to 30 carbon atoms.
- Ar is preferably an arylene group, more preferably a phenylene group.
- Y represents a divalent linking group.
- one R atom in the structural unit L (excluding a group containing a polymerizable functional group) has one more hydrogen atom from a group having one or more hydrogen atoms.
- Z represents any of a carbon atom, a silicon atom, or a phosphorus atom.
- W, the benzene ring, and Ar may have a substituent, and examples of the substituent include R in the structural unit L.
- the structural unit B in the case of having an alkyl chain having 6 to 20 carbon atoms, among the above, W, a benzene ring, or Ar is an alkyl chain having 6 to 20 carbon atoms as a substituent, or a compound of formula (Ia) What has the structure represented by these is mentioned.
- Examples of the structural unit B include those represented by the above formulas (85a) to (93a) and (1) to (32).
- the polymer (A) preferably has at least one polymerizable functional group (also referred to as “polymerizable substituent”) from the viewpoint of curing by a polymerization reaction and changing the solubility in a solvent.
- the “polymerizable functional group” refers to a functional group that can form a bond with each other by applying heat and / or light.
- Examples of the polymerizable functional group include a group having a carbon-carbon multiple bond (for example, vinyl group, allyl group, butenyl group, ethynyl group, acryloyl group, acryloyloxy group, acryloylamino group, methacryloyl group, methacryloyloxy group, methacryloylamino group).
- groups, vinyloxy groups, vinylamino groups, etc.) groups having a small ring (eg, cyclic alkyl groups such as cyclopropyl groups, cyclobutyl groups; cyclic ether groups such as epoxy groups (oxiranyl groups), oxetane groups (oxetanyl groups), etc.
- Diketene group Diketene group; episulfide group; lactone group; lactam group, etc.), heterocyclic group (for example, furan-yl group, pyrrol-yl group, thiophen-yl group, silole-yl group) and the like.
- a vinyl group, an acryloyl group, a methacryloyl group, an epoxy group, and an oxetane group are particularly preferable, and from the viewpoint of reactivity and characteristics of the organic electronics element, a vinyl group, an oxetane group, or an epoxy group is more preferable. An oxetane group is preferred and the most preferred.
- These groups may be substituted, and the substituent in the case of substitution is not particularly limited.
- the group is linear, cyclic or cyclic having 1 to 22 carbon atoms (more preferably 1 to 10 carbon atoms).
- a branched alkyl group is mentioned.
- the main skeleton of the polymer (A) and the polymerizable functional group are, for example, linear alkylene chains having 1 to 8 carbon atoms. It is preferable that it is connected.
- a hydrophilic chain such as an ethylene glycol chain or a diethylene glycol chain from the viewpoint of improving the affinity with a hydrophilic electrode such as ITO. preferable.
- the polymer (A) is polymerized with the end of the alkylene chain and / or the hydrophilic chain, that is, with these chains.
- the connecting part with the functional group and / or the connecting part between these chains and the skeleton of the polymer (A) may have an ether bond or an ester bond.
- group containing a polymerizable functional group means a polymerizable functional group itself or a group obtained by combining a polymerizable functional group with an alkylene chain or the like.
- a group containing a polymerizable functional group for example, a group exemplified in International Publication No. WO2010 / 140553 can be suitably used.
- the polymerizable functional group may be introduced into the terminal part (that is, the structural unit T) of the polymer (A) or may be introduced into a part other than the terminal part (that is, the structural unit L or B). And may be introduced into both of the portions other than the terminal. From the viewpoint of curability, it is preferably introduced at least at the end portion, and from the viewpoint of achieving both curability and charge transportability, it is preferably introduced only at the end portion.
- the polymerizable functional group may be introduced into the main chain of the polymer (A) or may be introduced into the side chain, and both the main chain and the side chain May be introduced.
- the polymerizable functional group is contained in the polymer (A) from the viewpoint of contributing to the change in solubility.
- the amount contained in the polymer (A) is small.
- the content of the polymerizable functional group can be appropriately set in consideration of these.
- the number of polymerizable functional groups per polymer (A) molecule is preferably 2 or more, more preferably 3 or more from the viewpoint of obtaining a sufficient change in solubility.
- the number of polymerizable functional groups is preferably 1,000 or less, more preferably 500 or less, from the viewpoint of maintaining charge transportability.
- the number of polymerizable functional groups per molecule of polymer (A) is the amount of polymerizable functional group used to synthesize polymer (A) (for example, the amount of monomer having a polymerizable functional group), each structural unit It can be determined as an average value using the monomer charge corresponding to 1 and the weight average molecular weight of the polymer (A).
- the number of polymerizable functional groups is the ratio between the integral value of the signal derived from the polymerizable functional group and the integral value of the entire spectrum in the 1 H NMR (nuclear magnetic resonance) spectrum of the polymer (A), the polymer (A)
- the weight average molecular weight can be used to calculate the average value. Since it is simple, when the preparation amount is clear, a value obtained by using the preparation amount is preferably adopted.
- the weight average molecular weight of the polymer (A) is preferably 1,000 or more, more preferably 2,000 or more, and 3,000 from the viewpoint of suppressing crystallization and obtaining good film forming properties. More preferably, it is the above.
- the weight average molecular weight of the polymer (A) is 1,000,000 or less from the viewpoint that the solubility in a solvent is improved and a composition containing a solvent described later can be easily prepared. Preferably, it is 900,000 or less, more preferably 800,000 or less.
- the “weight average molecular weight” refers to a weight average molecular weight in terms of standard polystyrene as determined by gel permeation chromatography (GPC).
- the weight average molecular weight of the polymer is preferably 1,000 to 1,000,000. More preferably, it is 2,000 to 900,000, and still more preferably 3,000 to 800,000.
- the average value of the number of structural units of the polymer (A) is preferably 2 or more, more preferably 5 or more, and even more preferably 10 or more from the viewpoint of obtaining good film-forming stability. Further, the average value of the number of units is preferably 1,000 or less, more preferably 500 or less, and even more preferably 200 or less, from the viewpoint that the solubility of the organic electronic material changes sufficiently and the organic layer can be easily laminated.
- the “average value of the number of structural units” can be determined from the weight average molecular weight of the polymer (A), the molecular weight of each structural unit, and the proportion of structural units in the polymer (A).
- the “ratio of structural units” can be determined from the ratio of charged monomers (molar ratio) of monomers corresponding to the structural units used to synthesize the polymer (A).
- the average value of the number of structural units of the polymer (A) is preferably 2 to 1,000, more preferably 5 to 500, and even more preferably 10 to 200.
- the structural unit L having hole transportability and the structural unit B having hole transportability (for example, structural units represented by the formulas (1a) to (93a)) with respect to all structural units in the polymer or (A) ) Is preferably 10 mol% or more, more preferably 25 mol% or more, and even more preferably 50 mol% or more from the viewpoint of obtaining excellent hole transportability.
- the ratio of the structural unit L having a hole transporting property and the structural unit B having a hole transporting property is preferably 95 mol% or less. 90 mol% or less is more preferable, and 80 mol% or less is further more preferable.
- the structural unit L having a hole transporting property and the structural unit B having a hole transporting property (for example, represented by the formulas (1a) to (93a)) with respect to all the structural units in the polymer (A).
- the structural unit) is preferably 10 to 95%, more preferably 25 to 90%, and still more preferably 50 to 80%.
- the proportion of the structural unit L relative to all the structural units of the polymer (A) is preferably 10 mol% or more, more preferably 20 mol% or more, and further preferably 30 mol% or more.
- the proportion of the structural unit L is preferably 95 mol% or less, more preferably 90 mol% or less, still more preferably 85 mol% or less, considering the structural unit T and the structural unit B introduced as necessary. 80 mol% or less is more preferable, and 75 mol% or less is more preferable.
- the proportion of the structural unit T contained in the polymer (A) is based on the total structural unit from the viewpoint of improving the characteristics of the organic electronics element or suppressing the increase in viscosity and favorably synthesizing the charge transporting polymer. 5 mol% or more is preferable, 10 mol% or more is more preferable, and 15 mol% or more is still more preferable.
- the proportion of the structural unit T is preferably 60 mol% or less, more preferably 55 mol% or less, and still more preferably 50 mol% or less from the viewpoint of obtaining sufficient charge transport properties.
- the structural unit B (for example, structural units represented by formulas (85a) to (93a) and formulas (30) to (32)) with respect to all the structural units in the polymer (A) ) Is preferably 1 mol% or more, more preferably 3 mol% or more, and even more preferably 10 mol% or more from the viewpoint of increasing the number of terminals and increasing the change in solubility. Further, the ratio of the structural unit B (for example, the structural unit represented by any one of the formulas (85a) to (93a) and the formulas (30) to (32)) depends on the gelation during the synthesis of the polymer (A).
- the structural unit B (for example, a structural unit represented by any one of the formulas (85a) to (93a) and the formulas (30) to (32)) with respect to all the structural units in the polymer (A).
- the ratio is preferably 1 to 50 mol%, more preferably 3 to 30 mol%, and still more preferably 10 to 25 mol%.
- the proportion of the structural unit T having a polymerizable functional group in the structural unit T of the polymer (A) is improved in luminous efficiency. And from a viewpoint of the improvement of a light emission lifetime, 50 mol% or less is preferable, 40 mol% or less is more preferable, 30 mol% or less is more preferable, 25 mol% or less is further more preferable, 20 mol% or less is further more preferable.
- the proportion of the structural unit T having a polymerizable functional group in the structural unit T of the polymer (A) is, for example, 1 mol% or more, 3 mol% or more, and 5 mol% or more. It may be 10 mol% or more.
- the proportion of the alkyl chain having 6 to 20 carbon atoms with respect to all structural units in the polymer (A) is preferably 20 mol% or more, more preferably 30 mol%, still more preferably 40 mol% or more. 50 mol% or more is more preferable.
- the proportion of the alkyl chain having 6 to 20 carbon atoms with respect to all the structural units in the polymer (A) may be 90 mol% or less, for example.
- the “ratio of alkyl chains having 6 to 20 carbon atoms” is the ratio of structural units having an alkyl chain having 6 to 20 carbon atoms.
- the structural unit L of the polymer (A) includes a structural unit having an alkyl chain having 6 to 20 carbon atoms
- the structural unit L of the structural unit L having an alkyl chain having 6 to 20 carbon atoms in the structural unit L of the polymer (A) is preferably 20 mol% or more, more preferably 40 mol% or more, and further preferably 60 mol% or more.
- the proportion of the structural unit L of the alkyl chain having 6 to 20 carbon atoms in the structural unit L of the polymer (A) may be, for example, 100 mol%, 95 mol% or less, 90 mol% It may be the following.
- the proportion of the structural unit can be determined using the amount of monomer charged corresponding to each structural unit used to synthesize the polymer (A). Moreover, the ratio of a structural unit can be calculated as an average value using the integrated value of the spectrum derived from each structural unit in the 1 H NMR spectrum of the polymer (A). Since it is simple, when the preparation amount is clear, a value obtained by using the preparation amount is preferably adopted.
- the polymer (A) can be produced by various synthetic methods known to those skilled in the art.
- T. Yamamoto et al. Bull. Chem. Soc. Jpn., 51, 7, 20911 (1978), M. Zembayashi et al., Tet. Lett., 47, 408989 (1977), and Suzuki (A. ⁇ Suzuki).
- Synthetic Communications, Vol.11, No.7, p.513 (1981) can be used.
- the method described in Suzuki (A. Suzuki) is general for the production of the polymer (A).
- each monomer unit for example, a monomer unit corresponding to the structural unit exemplified above can be used.
- Suzuki is a cross-coupling reaction (usually called “Suzuki reaction”) using a Pd catalyst between an aromatic boronic acid derivative and an aromatic halide.
- a polymer (A) can be manufactured by using desired aromatic rings for a coupling reaction.
- a Pd (II) salt or a soluble Pd compound in the form of a Pd (0) complex is generally used as the Pd catalyst.
- Pd catalyst 0.01 to 5 mol% Pd (Ph 3 P) 4 , Pd (OAc) 2 complex with tertiary phosphine ligand, Pd 2 (dba) 3 complex and PdCl 2 (dppf) based on aromatic reactants Complexes are the preferred Pd source.
- a base is generally also used, and the base is preferably an aqueous alkali carbonate or bicarbonate, or a hydroxide of tetraalkylammonium.
- the reaction can also be promoted in a nonpolar solvent using a phase transfer catalyst.
- a phase transfer catalyst As the solvent, N, N-dimethylformamide, toluene, anisole, dimethoxyethane, tetrahydrofuran and the like are used.
- the organic electronic material preferably further contains an initiator from the viewpoint of changing the solubility of the organic electronic material.
- an initiator it is possible to use a substance that can act as an oxidizing agent in the organic electronic material.
- Use of a substance that can act as an oxidizing agent for the polymer (A) is preferable from the viewpoint of improving hole transportability.
- an onium salt composed of a cation and an anion is preferable from the viewpoint of a change in the solubility of the composition, and details thereof will be described below.
- cation examples include H + , carbenium ion, ammonium ion, anilinium ion, pyridinium ion, imidazolium ion, pyrrolidinium ion, quinolinium ion, imonium ion, aminium ion, oxonium ion, and pyrylium ion.
- anion examples include halogen ions such as F ⁇ , Cl ⁇ , Br ⁇ and I ⁇ ; OH ⁇ ; ClO 4 ⁇ ; FSO 3 ⁇ , ClSO 3 ⁇ , CH 3 SO 3 ⁇ , C 6 H 5 SO 3 ⁇ .
- CF 3 SO 3 - sulfonate ion such as; HSO 4 -, SO 4 2- sulfate ions such as; HCO 3 -, carbonate ions such as CO 3 2-; H 2 PO 4 -, HPO 4 2 -, phosphate ion such as PO 4 3-; PF 6 -, PF 5 OH - fluorophosphate ions such as; [(CF 3 CF 2) 3 PF 3] -, [(CF 3 CF 2 CF 2 ) 3 PF 3 ] ⁇ , [((CF 3 ) 2 CF) 3 PF 3 ] ⁇ , [((CF 3 ) 2 CF) 2 PF 4 ] ⁇ , [((CF 3 ) 2 CFCF 2 ) 3 PF 3 ] , [((CF 3 ) 2 CFCF 2 ) 3 PF 3 ] -, [((CF 3 ) CFCF 2) 2 PF 4] - a fluorinated alkyl
- fluorophosphate ions such as PF 6 ⁇ and PF 5 OH — ; [(CF 3 CF 2 ) 3 PF 3 ] ⁇ , [(CF 3 CF 2 CF 2 ) 3 PF 3 ] ⁇ , [((CF 3 ) 2 CF) 3 PF 3 ] ⁇ , [((CF 3 ) 2 CF) 2 PF 4 ] ⁇ , [((CF 3 ) 2 CFCF 2 ) 3 PF 3 ] ⁇ , [((CF 3 ) 2 CFCF 2 ) 2 PF 4 ] — and the like; fluorinated alkyl fluorophosphate ions; (CF 3 SO 2 ) 3 C ⁇ , (CF 3 SO 2 ) 2 N - fluoroalkane methide such as, imide ion such; BF 4 -, B (C 6 F 5) 4 -, B (C 6 F 5) 4 -, B (C 6
- an initiator comprising one selected from borate ions and fluoroantimonate ions.
- anion and cation contained in this preferred initiator are not limited to the above, and known anions and cations can be used.
- the content of the initiator is preferably 0.1% by mass or more based on the mass of the polymer (A) from the viewpoint of changing the solubility of the organic electronic material and facilitating lamination. More preferably, it is more than 0.5 mass%, and still more preferably more than 0.5 mass%. In addition, the content of the initiator is preferably 30% by mass or less, and preferably 25% by mass or less from the viewpoint of preventing deterioration of device characteristics due to a substance derived from the initiator remaining in the organic layer. Is more preferable, and it is further more preferable that it is 20 mass% or less. Examples of the substance derived from the initiator include the initiator itself, a decomposition product of the initiator, and a reaction product.
- the content of the initiator is preferably in the range of 0.1 to 30% by mass and preferably in the range of 0.2 to 25% by mass with respect to the mass of the polymer (A).
- a range of 0.5 to 20% by mass is particularly preferable.
- Organic organic materials can change solubility by light irradiation and / or heating, and therefore, lamination by coating with the same kind of solvent becomes possible.
- light irradiation for example, light having a wavelength of 200 to 800 nm can be used.
- the heating temperature is preferably 60 to 300 ° C., more preferably 80 to 250 ° C., and further preferably 100 to 220 ° C.
- the heating time is preferably 10 seconds to 2 hours, more preferably 1 minute to 1 hour, still more preferably 1 to 10 minutes.
- the organic electronic material may further contain a solvent.
- a solvent capable of forming a coating layer using an organic electronic material can be used, and a solvent capable of dissolving the polymer (A) and the initiator can be preferably used.
- the solvent include water; alcohols such as methanol, ethanol and isopropyl alcohol; alkanes such as pentane, hexane and octane; cyclic alkanes such as cyclohexane; aromatic hydrocarbons such as benzene, toluene, xylene, mesitylene, tetralin and diphenylmethane.
- Aliphatic ethers such as ethylene glycol dimethyl ether, ethylene glycol diethyl ether, propylene glycol-1-monomethyl ether acetate; 1,2-dimethoxybenzene, 1,3-dimethoxybenzene, anisole, phenetole, 2-methoxytoluene, 3- Aromatic ethers such as methoxytoluene, 4-methoxytoluene, 2,3-dimethylanisole and 2,4-dimethylanisole; ethyl acetate, n-butyl acetate, ethyl lactate, and lactate n Aliphatic esters such as butyl; aromatic esters such as phenyl acetate, phenyl propionate, methyl benzoate, ethyl benzoate, propyl benzoate and n-butyl benzoate; N, N-dimethylformamide, N, N-dimethylacetamide Amide solvents such as dimethyl
- the content of the solvent in the organic electronic material can be determined in consideration of application to various coating methods.
- the content of the solvent is preferably such that the ratio of the polymer (A) to the solvent is 0.1% by mass or more, more preferably 0.2% by mass or more, and 0.5% by mass or more. Is more preferred.
- the solvent content is preferably such that the ratio of the polymer (A) to the solvent is 10% by mass or less, more preferably 5% by mass or less, and even more preferably 3% by mass or less.
- the content of the solvent in the organic electronic material is preferably such that the ratio of the polymer (A) to the solvent is 0.1 to 10% by mass, and is 0.2 to 5% by mass.
- the amount is more preferably 0.5 to 3% by mass.
- the alkyl chain having 6 to 20 carbon atoms is entangled with each other, for example, by the action of light and / or heat and an initiator. It is presumed that a structure in which the members are intertwined with each other and the solubility is changed.
- the polymer (A) may have a group that forms a bond such as a carbon-carbon double bond group or a group having a small ring.
- an organic electronic material can be used as the curable resin composition.
- the degree of change in the solubility of the organic electronic material in the solvent is large. “The solubility of the organic electronic material changes” can be confirmed by whether the solubility of the organic layer formed using the organic electronic material in the solvent changes before and after the application of light and / or heat. .
- the organic layer (1) is formed by a coating method using a composition containing the polymer (A), the initiator (B), and the solvent (1). After passing through an arbitrary drying step, light and / or heat is applied to the organic layer (1) to obtain the organic layer (2). Subsequently, the organic layer (2) is brought into contact with the solvent (2) to obtain the organic layer (3).
- the ratio of the thickness of the organic layer (3) to the thickness of the organic layer (2) is large.
- the residual ratio is preferably 50% or more, more preferably 80% or more, and further preferably 90% or more.
- the residual rate can be obtained from the ratio of the measured thickness values of the organic layer (2) and the organic layer (3) or the ratio of the measured absorbance values of the organic layer (2) and the organic layer (3).
- the thickness of the organic layer (2) may be in the same range as the thickness of the organic layer which is an embodiment of the present invention described later.
- the solvent (2) may be the same solvent as the solvent (1), or when the solvent (1) is a mixed solvent, the solvent having the largest weight ratio contained in the solvent (1) or toluene. it can.
- the solvent (1) the solvent having the largest weight ratio contained in the solvent (1), or the confirmation using toluene, it is preferable that the film thickness of the organic layer (3) is not less than the above. Confirmation using the solvent having the largest weight ratio contained in the solvent (1) or toluene is simple, and confirmation using toluene is particularly easy.
- the organic electronics material contains the polymer (A) having a structural unit having a hole transport property as described above, the hole transport used for forming an organic electronics element such as an organic EL element or an organic photoelectric conversion element. It can preferably be used as a material composition.
- an embodiment of the present invention relates to an ink composition containing the organic electronic material.
- the ink composition may contain the polymer (A) and generally a solvent capable of dissolving or dispersing the polymer (A).
- it contains a polymer (A), an initiator, and a solvent capable of dissolving or dispersing them. Examples of the solvent are as described above.
- the ink composition may further contain an additive as an optional component.
- additives include polymerization inhibitors, stabilizers, thickeners, gelling agents, flame retardants, antioxidants, antioxidants, oxidizing agents, reducing agents, surface modifiers, emulsifiers, antifoaming agents, Examples thereof include a dispersant and a surfactant.
- the content of the solvent in the ink composition can be determined in consideration of application to various coating methods.
- the content of the solvent is preferably such that the ratio of the polymer (A) to the solvent is 0.1% by mass or more, more preferably 0.2% by mass or more, and 0.5% by mass or more. More preferred is an amount of Further, the content of the solvent is preferably such that the ratio of the polymer (A) to the solvent is 20% by mass or less, more preferably 15% by mass or less, and even more preferably 10% by mass or less. .
- an embodiment of the present invention relates to an organic layer formed from the organic electronic material or the ink composition.
- the organic layer can be obtained, for example, by adding heat, light, or both heat and light to a layer formed by applying these compositions, thereby obtaining an organic layer having a different solubility from that before addition.
- a coating method for example, an ink jet method, a casting method, a dipping method, a relief printing, an intaglio printing, an offset printing, a flat plate printing, a relief printing offset printing, a printing method such as a screen printing, a gravure printing, a known method such as a spin coating method, etc. The method is mentioned.
- the coating can be carried out usually in a temperature range of ⁇ 20 to + 300 ° C., preferably 10 to 100 ° C., particularly preferably 15 to 50 ° C. Further, after coating, the obtained organic layer is usually dried in a temperature range of +30 to + 300 ° C., preferably 60 to 250 ° C., particularly preferably 80 to 220 ° C. by a hot plate or oven to remove the solvent. May be.
- the drying time is usually 10 seconds to 2 hours, preferably 1 minute to 1 hour, particularly preferably 1 to 10 minutes.
- Conditions for applying light and / or heat are as described above. Since the organic layer has low solubility in a solvent, another organic layer can be easily formed on the organic layer using a coating solution.
- the solvent contained in the coating solution when forming another organic layer is not limited to the above-mentioned solvent (2).
- a light source such as a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a metal halide lamp, a xenon lamp, a fluorescent lamp, a light emitting diode, or sunlight can be used, and heating is performed on a hot plate or in an oven. Can be done within.
- the thickness of the organic layer can be appropriately set depending on the application.
- the thickness can be 5 nm to 10 ⁇ m.
- the thickness of the organic layer changes in solubility from the viewpoint of relaxing the surface roughness of the anode and reducing short circuit.
- 5 nm or more is preferable, 10 nm or more is more preferable, and 20 nm or more is more preferable.
- the thickness of the organic layer is preferably 500 nm or less, more preferably 200 nm or less, and even more preferably 100 nm or less from the viewpoint of reducing the driving voltage of the organic EL element. Specifically, it is preferably 5 to 500 nm, more preferably 10 to 200 nm, and further preferably 20 to 100 nm.
- Organic electronics elements such as the organic EL element which has the above-mentioned organic layer, and an organic photoelectric conversion element.
- Organic electronic devices have at least two electrodes and an organic layer located between the electrodes.
- the embodiment of the present invention relates to a display element and an illumination device using an organic EL element.
- the organic EL element of the embodiment of the present invention includes the organic layer.
- the organic EL element usually includes a light emitting layer, an anode, a cathode, and a substrate, and may have other layers such as a hole injection layer, an electron injection layer, a hole transport layer, and an electron transport layer. .
- the organic EL element has at least the above-described organic layer.
- the organic layer can be used as a light emitting layer and other layers, and preferably used as a hole injection layer and / or a hole transport layer. be able to.
- FIG. 1 is a schematic cross-sectional view showing an embodiment of an organic EL element.
- the organic EL element of FIG. 1 is an element having a multilayer structure, and includes a substrate 8, an anode 2, a hole injection layer 3, a hole transport layer 6, a light emitting layer 1, an electron transport layer 7, an electron injection layer 5, and a cathode 4. In this order.
- each layer will be described in detail.
- the material used for the light emitting layer may be a low molecular compound, a polymer or an oligomer, and a dendrimer or the like can also be used.
- Low molecular weight compounds that utilize fluorescence include perylene, coumarin, rubrene, quinacridone, dye dyes for dye laser (eg, rhodamine, DCM1, etc.), aluminum complexes (eg, Tris (8-hydroxyquinolinato) aluminum (III) (Alq 3 )), Stilbene, and derivatives thereof.
- Polymers or oligomers that utilize fluorescence include polyfluorene, polyphenylene, polyphenylene vinylene (PPV), polyvinyl carbazole (PVK), fluorene-benzothiadiazole copolymer, fluorene-triphenylamine copolymer, derivatives and mixtures thereof. Etc. can be suitably used.
- phosphorescent organic EL elements have been actively developed to increase the efficiency of organic EL elements.
- the phosphorescent organic EL element not only singlet state energy but also triplet state energy can be used, and the internal quantum yield can be increased to 100% in principle.
- phosphorescence is extracted by doping a host material with a metal complex-based phosphorescent material containing a heavy metal such as platinum or iridium as a phosphorescent dopant (M. A. Baldo et al., Nature, vol. 395, p. 151 (1998), M. A. Baldo et al., Applied Physics Letters, vol. 75, p. 4 (1999), M. A. Baldo et al., Nature, vol. 403, p. 750 (2000)).
- a phosphorescent material can be used for the light emitting layer from the viewpoint of high efficiency.
- a metal complex containing a central metal such as Ir or Pt can be preferably used.
- Ir complex for example, FIr (pic) [iridium (III) bis [(4,6-difluorophenyl) -pyridinate-N, C 2 ] picolinate] that emits blue light, and green light emission.
- Ir (ppy) 3 [Factris (2-phenylpyridine) iridium] (see M. A. Baldo etal., Nature, vol. 403, p.
- red light btp 2 Ir (acac ) ⁇ Bis [2- (2′-benzo [4,5- ⁇ ] thienyl) pyridinate-N, C 3 ] iridium (acetyl-acetonate) ⁇ (Adachi et al., Appl. Phys. Lett., 78 no. 11, 2001, 1622), Ir (piq) 3 [tris (1-phenylisoquinoline) iridium] and the like.
- Pt complex include 2,3,7,8,12,13,17, 18-octaethyl-21H, 23H-forminplatinum (PtOEP) that emits red light.
- the phosphorescent material can be a low molecular weight compound or a dendriide species, such as an iridium nucleus dendrimer. Moreover, these derivatives can also be used conveniently.
- the phosphorescent material when included in the light emitting layer, it is preferable to include a host material in addition to the phosphorescent material.
- the host material may be a low molecular compound or a polymer, and a dendrimer or the like can also be used.
- the low molecular weight compound include CBP (4,4′-bis (9H-carbazol-9-yl) biphenyl), mCP (1,3-bis (9-carbazolyl) benzene), CDBP (4,4′- Bis (carbazol-9-yl) -2,2′-dimethylbiphenyl) and derivatives thereof.
- the polymer include polyvinylcarbazole, polyphenylene, polyfluorene, and derivatives thereof.
- the light emitting layer may be formed by a vapor deposition method or a coating method.
- an organic EL element When forming by a coating method, an organic EL element can be manufactured at low cost, and is more preferable.
- the light emitting layer can be formed by applying a solution containing a phosphorescent material and, if necessary, a host material on a desired substrate by a known application method.
- the coating method include an inkjet method, a casting method, a dipping method, a relief printing, an intaglio printing, an offset printing, a flat plate printing, a relief printing reverse offset printing, a printing method such as a screen printing and a gravure printing, and a spin coating method. .
- the cathode material is preferably a metal or metal alloy such as Li, Ca, Mg, Al, In, Cs, Ba, Mg / Ag, LiF, and CsF.
- anode As the anode, a metal (eg, Au) or other material having metal conductivity can be used.
- the other materials include oxides (for example, ITO: indium oxide / tin oxide) and conductive polymers (for example, polythiophene-polystyrene sulfonic acid mixture (PEDOT: PSS)).
- the organic layer formed using the above composition is preferably used as at least one of a hole injection layer and a hole transport layer.
- a known material can be used for the hole transport layer.
- an organic EL element has an organic layer formed using the above composition as a hole transport layer and further has a hole injection layer, a known material can be used for the hole injection layer.
- the organic EL element may have an organic layer as a hole injection transport layer, or may have two organic layers as a hole injection layer and a hole transport layer.
- Examples of the electron transport layer and the electron injection layer include phenanthroline derivatives (for example, 2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP)), bipyridine derivatives, nitro-substituted fluorene derivatives, diphenylquinone derivatives.
- phenanthroline derivatives for example, 2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP)
- bipyridine derivatives for example, 2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP)
- bipyridine derivatives for example, 2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP)
- BCP 2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline
- Thiopyran dioxide derivatives condensed ring tetracarboxylic anhydrides such as naphthalene and perylene, carbodiimides, fluorenylidenemethane derivatives, anthraquinodimethane and anthrone derivatives, oxadiazole derivatives (eg 2- (4-Biphenylyl) -5- (4-tert-butylphenyl-1,3,4-oxadiazole) (PBD)), aluminum complexes (eg, Tris (8-hydroxyquinolinato) aluminum (III) (Alq 3 ), Bis (2-methyl-8 -quninolinato) -4-phenylphenolate aluminum (III) (BAlq)).
- oxadiazole derivatives eg 2- (4-Biphenylyl) -5- (4-tert-butylphenyl-1,3,4-oxadiazole) (PBD)
- PBD oxadiazole derivatives
- aluminum complexes
- a thiadiazole derivative in which the oxygen atom of the oxadiazole ring is substituted with a sulfur atom, or a quinoxaline derivative having a quinoxaline ring known as an electron withdrawing group can be used.
- the substrate that can be used for the organic EL element is not particularly limited. Further, a transparent substrate is preferable, and glass, quartz, a light transmissive resin film, and the like are preferably used. When a resin film is used, flexibility can be imparted to the organic EL element (that is, a flexible substrate), which is particularly preferable.
- the resin film include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), polyetherimide, polyetheretherketone, polyphenylene sulfide, polyarylate, polyimide, polycarbonate (PC), and cellulose triacetate.
- TAC cellulose acetate propionate
- the organic EL element which is an embodiment of the present invention may be sealed by the same method as the photoelectric conversion element described later in order to extend the life by reducing the influence of outside air.
- the color of light emitted from the organic EL element is not particularly limited, but the white light-emitting element is preferable because it can be used for various lighting devices such as home lighting, interior lighting, clocks, and liquid crystal backlights.
- a plurality of light emitting colors can be simultaneously emitted and mixed using a plurality of light emitting materials.
- White luminescence is obtained.
- a combination of a plurality of emission colors is not particularly limited, but a combination of three emission maximum wavelengths of blue, green, and red, and complementary colors such as blue and yellow, yellow green and orange are used. And those containing the two emission maximum wavelengths.
- the emission color can be controlled by adjusting the type and amount of the phosphorescent material.
- a display element according to an embodiment of the present invention includes the organic EL element described above.
- a color display element can be obtained by using the organic EL element as an element corresponding to each pixel of red, green, and blue (RGB).
- the illumination device according to the embodiment of the present invention includes the above-described organic EL element.
- the display apparatus which is embodiment of this invention is provided with the illuminating device and the liquid crystal element as a display means.
- the illumination device may be used as a backlight (white light source), and a display device using a liquid crystal element as a display unit, that is, a liquid crystal display device may be used.
- This configuration is a configuration in which only a backlight is replaced with the illumination device in a known liquid crystal display device, and a known technique can be diverted to the liquid crystal element portion.
- the organic photoelectric conversion element includes an organic solar cell and an organic photosensor, and usually includes a photoelectric conversion layer, an electrode, and a substrate. Furthermore, you may have 1 or more types of other layers, such as a buffer layer and an electron carrying layer, in order to improve conversion efficiency or the stability in the air.
- the organic photoelectric conversion element has at least the above-described organic layer, and the organic layer can be used as a photoelectric conversion layer and a buffer layer, and is preferably used as a buffer layer. Therefore, the example of the organic photoelectric conversion element includes an anode, an organic layer as a buffer layer, a photoelectric conversion layer, and a cathode in this order, and may further include an arbitrary layer between these layers. The configuration of the organic photoelectric conversion element is described below.
- Photoelectric conversion layer Any material can be used for the photoelectric conversion layer as long as it absorbs light to cause charge separation and generate electromotive force.
- a mixture obtained by blending a p-type organic semiconductor and an n-type organic semiconductor is preferable.
- the p-type organic semiconductor include polymers or oligomers such as oligothiophene, polyalkylthiophene, poly (3-hexylthiophene) (P3HT), polyphenylene vinylene (PPV); porphyrin, phthalocyanine, copper phthalocyanine; It can be suitably used.
- n-type organic semiconductor examples include CN-poly (phenylene-vinylene) (CN-PPV), MEH-CN-PPV, and —CN group- or CF 3 group-containing polymers or oligomers such as —CF 3 substituted polymers thereof; Polymers or oligomers such as poly (fluorene) derivatives, fluorene-benzothiadiazole copolymers; fullerene (C 60 ), [6,6] -Phenyl-C 61 -butyric acid methyl ester (PCBM), [6,6]- Phenyl-C 71 -butyric acid methyl ester (PCBM), naphthalenetetracarboxylic acid anhydride (NTCDA), perylenetetracarboxylic acid anhydride (PTCDA), naphthalenetetracarboxylic acid diimide, perylenetetracarboxylic acid diimide, quinacdrine; derivatives thereof Etc.
- the method for forming the photoelectric conversion layer is not particularly limited, and may be formed by a vapor deposition method or a coating method.
- a coating method an organic photoelectric conversion element can be manufactured cheaply and it is more preferable.
- a method of forming by a coating method the method described in the method of forming a light emitting layer can be used.
- the organic photoelectric conversion element has the above-described buffer layer in addition to the photoelectric conversion layer, and may further have a layer such as an electron transport layer.
- the buffer layer the above-described organic layer can be used, and as the electron transport layer, LiF, TiOx, ZnOx, or the like is generally used.
- Electrode Any material can be used for the electrode as long as it has conductivity.
- the electrode include platinum, gold, silver, aluminum, chromium, nickel, copper, titanium, magnesium, calcium, barium, sodium, lithium fluoride and other metals or alloys or salts thereof; indium oxide, tin oxide, etc.
- ITO Metal oxides or alloys thereof
- conductive polymers such as polyaniline, polypyrrole, polythiophene and polyacetylene; acids such as hydrochloric acid, sulfuric acid and sulfonic acid; Lewis acids such as FeCl 3 ; halogen atoms such as iodine; sodium;
- a dopant such as a metal atom such as potassium is added
- a conductive composite material in which conductive particles such as metal particles, carbon black, fullerene, and carbon nanotubes are dispersed in a matrix such as a polymer binder. . Moreover, you may use combining these.
- At least a pair (two) of electrodes are provided, but at least one of them is a transparent electrode.
- the transparent electrode include oxides such as indium tin oxide (ITO) and indium zinc oxide (IZO); metal thin films; and conductive polymers such as PEDOT: PSS.
- the electrode has a function of collecting holes and electrons generated in the photoelectric conversion layer, and it is preferable to use a pair of electrode materials suitable for collecting holes and electrons.
- the electrode material suitable for collecting holes include materials having a high work function such as Au and ITO.
- examples of the electrode suitable for collecting electrons include a material having a low work function such as Al.
- the method for forming the electrode is not particularly limited, and for example, vacuum deposition, sputtering, coating method or the like can be used.
- any material can be used as long as it can support each layer.
- the substrate include inorganic materials such as glass; polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), polyimide (PI), polyetherimide (PEI), and cycloolefin polymer (COP).
- Organic materials such as polyphenylene sulfide (PPS), nylon, polystyrene, polyethylene, polypropylene, polyvinyl alcohol, fluorine resin, vinyl chloride, cellulose, polyvinylidene chloride, aramid, polyurethane, polycarbonate, polyarylate, polynorbornene, polylactic acid; insulation
- PPS polyphenylene sulfide
- nylon polystyrene
- polyethylene polyethylene
- polypropylene polyvinyl alcohol
- fluorine resin vinyl chloride
- cellulose polyvinylidene chloride
- aramid polyurethane
- polycarbonate polyarylate
- polynorbornene polylactic acid
- insulation such as metals such as stainless steel, titanium, and aluminum whose surfaces are coated or laminated in order to impart properties.
- a substrate on which an inorganic material such as silicon oxide or silicon nitride is stacked may be used for providing gas barrier properties.
- a film made of an organic material such as PET, PEN, PES, PI, PEI, COP, or PPS is preferable because it can provide transparency and flexibility.
- the organic photoelectric conversion element according to the embodiment of the present invention may be sealed in order to reduce the influence of outside air and extend the life.
- a material used for sealing glass, epoxy resin, acrylic resin, plastic films such as PET and PEN, inorganic materials such as silicon oxide and silicon nitride, and the like can be used.
- the sealing method is not particularly limited. For example, a method of directly forming on an organic photoelectric conversion element by vacuum deposition, sputtering, coating method, or the like, a method of attaching glass or plastic film to the organic photoelectric conversion element with an adhesive Etc. can be used.
- Embodiments of the present invention include the following.
- the present invention is not limited to the following embodiment.
- An organic electronic material comprising a polymer or oligomer having a structural unit having a hole transporting property and having an alkyl chain having 6 to 20 carbon atoms.
- the structural unit having a hole transporting property includes a structural unit including an aromatic amine structure, a structural unit including a carbazole structure, a structural unit including a thiophene structure, a structural unit including a fluorene structure, and a structure including a furan structure.
- the organic electronic material according to ⁇ 1> comprising at least one structural unit selected from the group consisting of units.
- ⁇ 5> The organic electronic material according to any one of ⁇ 1> to ⁇ 4>, wherein the polymer or oligomer has an alkyl chain having 8 to 12 carbon atoms.
- ⁇ 6> The organic electronic material according to any one of ⁇ 1> to ⁇ 5>, wherein the polymer or oligomer has a branched structure.
- the polymer or oligomer includes a structural unit containing at least one selected from the group consisting of the structures represented by the following general formulas (1) to (10) as a unit serving as a base point for forming a branched structure: ⁇ 6 > Organic electronics materials described in>.
- ⁇ 11> An organic layer formed using the organic electronic material according to any one of ⁇ 1> to ⁇ 9> or the ink composition according to ⁇ 10>.
- ⁇ 12> An organic electronics element comprising at least one organic layer according to ⁇ 11>.
- ⁇ 13> An organic electroluminescence device comprising at least one organic layer according to ⁇ 11>.
- ⁇ 14> The organic electroluminescent element according to ⁇ 13>, further comprising a flexible substrate.
- ⁇ 15> The organic electroluminescent element according to ⁇ 13>, further comprising a resin film substrate.
- a display device comprising the organic electroluminescent device according to any one of ⁇ 13> to ⁇ 15>.
- ⁇ 17> An illumination device comprising the organic electroluminescent element according to any one of ⁇ 13> to ⁇ 15>.
- ⁇ 18> A display device comprising the illumination device according to ⁇ 17> and a liquid crystal element as a display means.
- an organic electronic material an organic electronic material having an alkyl chain having 6 to 20 carbon atoms in a divalent structural unit; an organic electronic material further including an initiator, and the initiator including an oxidizing agent; In addition, organic electronic materials including an onium salt as an initiator; and organic lecttronic materials in which the weight average molecular weight of the polymer (A) is 1,000 to 1,000,000.
- Examples of the organic electronics element include an element having at least two electrodes and an organic layer positioned between the electrodes; examples of the organic electroluminescence element include an anode, an organic layer, a light emitting layer, In addition, examples of the organic photoelectric conversion element include an anode, an organic layer, a photoelectric conversion layer, and an element having a cathode.
- a scavenger having the same mass as the polymer (“Triphenylphosphine,“ polymer-bound styrene-divinylbenzene copolymer ”manufactured by Strem Chemical Co.) was added to the solution, and the mixture was refluxed and stirred for 1 hour or longer. Thereafter, the scavenger was filtered off with a polytetrafluoroethylene filter (Dismic 25JP020AN) having a pore diameter of 0.2 ⁇ m, and mixed with methanol to reprecipitate. The polymer was collected by filtration and vacuum dried in a desiccator to obtain a charge transporting polymer 1.
- the charge transporting polymer 2, the charge transporting polymer 3, the charge transporting polymer 4 are the same as the charge transporting polymer 1 except that the mixing ratio of the monomers used in the synthesis is changed to the ratio described in Table 1 below. Was synthesized.
- —C 4 H 9 is an n-butyl group (a linear alkyl group having 4 carbon atoms).
- Charge transporting polymer 9 and charge transporting polymer 10 were synthesized.
- the charge transporting polymer 12 and the charge transporting polymer 13 were synthesized in the same manner as the charge transporting polymer 11 except that the mixing ratio of the monomers used for the synthesis was changed to the ratio described in Table 3 below.
- the measurement conditions for GPC are as follows. Equipment: High-performance liquid chromatograph Prominence, Shimadzu Corporation Liquid feed pump (LC-20AD) Deaeration unit (DGU-20A) Autosampler (SIL-20AHT) Column oven (CTO-20A) PDA detector (SPD-M20A) Differential refractive index detector (RID-20A) Column: Gelpack (registered trademark) GL-A160S (Production number: 686-1J27) GL-A150S (manufacturing number: 685-1J27) Hitachi Chemical Co., Ltd. Eluent: Tetrahydrofuran (THF) (for HPLC, containing stabilizer) Wako Pure Chemical Industries, Ltd. Flow rate: 1 mL / min Column temperature: 40 ° C Detection wavelength: 254 nm Molecular weight reference material: PStQuick A / B / C Tosoh Corporation
- the elution time of a polymer having a molecular weight of 20,000 can be determined using a calibration curve calculated from the elution time of a polystyrene standard sample having a known molecular weight.
- the weight average molecular weight, number average molecular weight, and ratio of low molecular weight components (GPC chart area ratio) of the obtained polymer were determined by GPC.
- the measurement conditions for GPC are as described above.
- the obtained values are shown in Table 5.
- ⁇ Low molecular weight component> First, how to determine the component ratio of the low molecular weight component of the charge transporting polymer, defined using GPC (gel permeation chromatography), will be described.
- a component having a molecular weight of less than 20,000 that is, a low molecular weight component
- the total chart area is the area of the entire peak excluding the solvent and impurity peaks.
- Example 1 Coating solution in which a solution in which charge transporting polymer 1 (10 mg) is dissolved in 1100 ⁇ L of toluene and a solution in which ionic compound 1 (1 mg) represented by the following chemical formula is dissolved in 50 ⁇ L of toluene as an initiator are mixed was spin-coated on a quartz plate at 3000 rpm. Subsequently, the polymerization reaction was performed by heating at 200 ° C. for 10 minutes on a hot plate. After heating, the quartz plate was immersed in a toluene solvent for 10 seconds for washing.
- UV-VIS spectrum was measured under the following conditions.
- Example 2 Comparative Examples 1 to 3
- an organic layer was formed in the same manner as in Example 1 except that any one of the charge transporting polymers shown in Table 2 below was used, and the remaining film ratio was measured. The results are shown in Table 6.
- each of Examples 1 and 5 is compared with Comparative Example 2 and each of Examples 2 and 6 is compared with Comparative Example 3 to have a polymerizable functional group in the (T) monomer.
- Examples 1 and 5, and Examples 2 and 6 in which the monomer 1 having an alkyl chain having 8 carbon atoms is blended in the (L) monomer even though the proportion of the monomer 3 is the same, It can be seen that the value of the remaining film rate is high. Further, from comparison between Example 2 and Example 6 and comparison between Example 3 and Example 7, it can be seen that the greater the proportion of monomer 1 in (L) monomer, the higher the solvent resistance. As described above, in Examples, the solvent resistance was improved when having an alkyl chain having 6 to 20 carbon atoms even though the blending amount of the polymerizable functional group was the same.
- Example 11 A coating solution in which a solution in which charge transporting polymer 1 (10 mg) is dissolved in 1100 ⁇ L of toluene and a solution in which ionic compound 1 (1 mg) is dissolved in 50 ⁇ L of toluene is mixed is spun onto a quartz plate at 3000 rpm. Coated. Subsequently, the polymerization reaction was performed by heating at 230 ° C. for 30 minutes on a hot plate. After heating, the quartz plate was immersed in a toluene solvent for 10 seconds for washing.
- UV-VIS spectrum was measured under the following conditions.
- Example 12 to 20 Comparative Examples 4 to 6
- the charge transporting polymer 1 instead of the charge transporting polymer 1, an organic layer was formed in the same manner as in Example 11 except that any one of the charge transporting polymers shown in Table 3 below was used, and the remaining film ratio was measured. The results are shown in Table 7.
- Example 3-1 ⁇ Production of organic EL element>
- the charge transport polymer 14 is spin-coated on a glass substrate patterned with ITO to a width of 1.6 mm at a rotation speed of 3000 min ⁇ 1 , and is heated and dried in air on a hot plate at 200 ° C. for 10 minutes to form holes. An injection layer (40 nm) was formed. Subsequent experiments were performed in a dry nitrogen environment.
- Charge transporting polymer 1 (4.5 mg), the ionic compound 1 (0.13 mg), and toluene (1.2 mL) were mixed to prepare an ink composition for forming a hole transporting layer.
- This ink composition was spin-coated on the hole injection layer obtained above at a rotational speed of 3000 min ⁇ 1 and then cured by heating on a hot plate at 230 ° C. for 30 minutes to obtain a hole transport layer (40 nm). Formed.
- the glass substrate obtained above was transferred into a vacuum vapor deposition machine, and CBP: Ir (ppy) 3 (94: 6, 30 nm), BAlq (10 nm), Alq 3 (30 nm), LiF (on the hole transport layer) 0.8 nm) and Al (100 nm) were deposited in this order to form a film, and a light emitting layer, a hole blocking layer, an electron transport layer, an electron injection layer, and a cathode were laminated.
- the laminated glass substrate is transferred to a dry nitrogen environment without opening to the atmosphere.
- This is a sealing glass obtained by applying 0.4 mm counterbore to 0.7 mm non-alkali glass, and photocuring.
- a polymer type organic EL device having a multilayer structure was produced by sealing using an adhesive epoxy resin.
- Example 3-1 An organic EL device was produced in the same manner as in Example 3-1, except that any of the polymers shown in Table 8 was used instead of the charge transporting polymer 1 to form the hole transporting layer.
- the organic EL elements of Examples 3-1 to 3-4 showed a driving voltage comparable to or lower than that of Comparative Example 3-1, and emitted light more than that of Comparative Example 3-1. Excellent efficiency and long light emission lifetime.
- the ratio of the monomer 3 having a polymerizable functional group in the (T) monomer was It can be seen that the smaller the number, the longer the lifetime of light emission. That is, by using the monomer 1, while maintaining sufficient solvent resistance, the ratio of the monomer 3 in the (T) monomer was successfully reduced, and by using the charge transporting polymer, luminous efficiency and light emission were achieved. A special effect of improving the service life was obtained.
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Abstract
Description
塗布式プロセスに使用可能な材料として、例えば、国際公開第2010/140553号には3方向に分岐する構造を有するポリマー又はオリゴマーを含む有機エレクトロニクス材料が開示されている。
本発明の他の実施形態は、前記有機エレクトロルミネセンス素子を備えた、表示素子に関する。
本発明の他の実施形態は、前記有機エレクトロルミネセンス素子を備えた、照明装置に関する。
本発明の他の実施形態は、前記照明装置と、表示手段として液晶素子とを備えた、表示装置に関する。
本発明の実施形態である有機エレクトロニクス材料は、正孔輸送性を有する構造単位を有し、かつ、炭素数6~20のアルキル鎖を有するポリマー又はオリゴマー(以下、これを「ポリマー(A)」と記す場合がある。)を含む。
有機エレクトロニクス材料は、必要に応じ、開始剤、溶媒等の他の成分を含有していてもよい。また、有機エレクトロニクス材料は、ポリマー(A)を、1種のみ含有していても、又は、2種以上含有していてもよい。開始剤、溶媒等の任意で含んでいてもよい成分についても、それぞれ1種のみ含んでいても、又は、それぞれ複数種含んでいてもよい。
しかし、重合性官能基を有するポリマー又はオリゴマー用いた場合、有機EL素子が駆動する際に、未架橋の重合性官能基、又は、架橋により結合した構造が有機EL素子特性を劣化させる要因の1つとなり得る場合があった。
推論ではあるが、有機エレクトロニクス材料を薄膜として塗布した後、高温で加温し溶媒が揮発してポリマー(A)の分子が隣接する際に、長鎖アルキル鎖が互いに絡まりあうことで硬化後の耐溶剤性を高めることができると考察する。
また、炭素数6~20のアルキル鎖を有するポリマー(A)を用いるとき、発光効率及び発光寿命を向上させることもできる。
ポリマー(A)は、正孔輸送性を有する構造単位を有し、かつ、炭素数6~20のアルキル鎖を有する。
ポリマー(A)は、直鎖状のポリマーであっても、又は、分子中に分岐構造を有し、かつ、末端を3つ以上有するポリマーであってもよい。分岐構造とは、ポリマー鎖が分岐部を有し、分岐部から3方向以上に向かって構造単位を有する構造をいう。分岐構造を有し、かつ、末端が3つ以上あるポリマー(A)は、主鎖と側鎖とから構成されている。
芳香族炭化水素としては、例えば、ベンゼン、ビフェニル、ターフェニル、トリフェニルベンゼン、ナフタレン、アントラセン、テトラセン、フルオレン、フェナントレン等が挙げられる。
芳香族複素環としては、例えば、ピリジン、ピラジン、キノリン、イソキノリン、アクリジン、フェナントロリン、フラン、ピロール、チオフェン、カルバゾール、オキサゾール、オキサジアゾール、チアジアゾール、トリアゾール、ベンゾオキサゾール、ベンゾオキサジアゾール、ベンゾチアジアゾール、ベンゾトリアゾール、ベンゾチオフェン等が挙げられる。
ポリマー(A)は、これらの正孔輸送性を有する構造単位を2種以上有していてもよい。
ポリマー(A)は、正孔輸送性を有する構造単位の少なくとも1つに、炭素数6~20のアルキル鎖を有することが好ましい。
共重合体は、交互、ランダム、ブロック又はグラフト共重合体であってもよいし、それらの中間的な構造を有する共重合体、例えばブロック性を帯びたランダム共重合体であってもよい。
<式(1a)~(84a)>
アリール基としては、フェニル、ビフェニル-イル、ターフェニル-イル、ナフタレン-イル、アントラセン-イル、テトラセン-イル、フルオレン-イル、フェナントレン-イル等が挙げられる。
ヘテロアリール基としては、ピリジン-イル、ピラジン-イル、キノリン-イル、イソキノリン-イル、アクリジン-イル、フェナントロリン-イル、フラン-イル、ピロール-イル、チオフェン-イル、カルバゾール-イル、オキサゾール-イル、オキサジアゾール-イル、チアジアゾール-イル、トリアゾール-イル、ベンゾオキサゾール-イル、ベンゾオキサジアゾール-イル、ベンゾチアジアゾール-イル、ベンゾトリアゾール-イル、ベンゾチオフェン-イル等が挙げられる。なお、以下においても、アルキル基、並びに、アリール基及びヘテロアリール基として、これらと同様の例を用いることができる。
炭素数6~20のアルキル鎖の例としては、n-ヘキシル基、n-ヘプチル基、n-オクチル基、n-ノニル基、n-デシル基、n-ウンデシル基、n-ドデシル基、n-トリデシル基、n-テトラデシル基、n-ペンタデシル基、n-ヘキサデシル基、n-ヘプタデシル基、n-オクタデシル基、n-ノナデシル基、n-イコシル基が挙げられる。
好ましいポリマー(A)の例として、2価の構造単位と、後述する、分岐部を構成する3価以上の構造単位(例えば式(85a)~(93a)及び式(30)~(32)のいずれかで表される構造単位)とを有し、かつ、2価の構造単位に炭素数6~20のアルキル鎖を有するものが挙げられる。2価の構造単位に炭素数6~20のアルキル鎖を有するポリマー(A)は、例えば、合成に用いるモノマーとして上記の具体的な構造例に対応するモノマーを用いることにより得ることができる。
ポリマー(A)は、上述の通り、直鎖状であっても、又は、分岐構造を有していてもよい。ポリマー(A)は、好ましくは、電荷輸送性を有する2価の構造単位Lと末端部を構成する1価の構造単位Tとを少なくとも含み、分岐部を構成する3価以上の構造単位Bをさらに含んでもよい。ポリマー(A)は、各構造単位を、それぞれ1種のみ含んでいても、又は、それぞれ複数種含んでいてもよい。ポリマー(A)において、各構造単位は、「1価」~「3価以上」の結合部位において互いに結合している。以下、1価の構造単位を「構造単位T」と、2価の構造単位を「構造単位L」と、3価以上の構造単位を「構造単位B」という場合がある。
炭素数6~20のアルキル鎖は、構造単位L、B及びTのいずれに含まれていてもよいが、構造単位L及び/又はBのいずれか1つ以上に含まれていることがより好ましく、少なくとも構造単位Lに含まれることがより好ましい。炭素数6~20のアルキル鎖は、正孔輸送性を有する構造単位L及び/又はBのいずれか1つ以上に含まれていることがより好ましく、少なくとも、正孔輸送性を有する構造単位Lに含まれることがより好ましい。
構造単位Lは、電荷輸送性を有する2価の構造単位である。例えば、構造単位Lは、置換又は非置換の、芳香族アミン構造、カルバゾール構造、チオフェン構造、フルオレン構造、ベンゼン構造、ビフェニル構造、ターフェニル構造、ナフタレン構造、アントラセン構造、テトラセン構造、フェナントレン構造、ジヒドロフェナントレン構造、ピリジン構造、ピラジン構造、キノリン構造、イソキノリン構造、キノキサリン構造、アクリジン構造、ジアザフェナントレン構造、フラン構造、ピロール構造、オキサゾール構造、オキサジアゾール構造、チアゾール構造、チアジアゾール構造、トリアゾール構造、ベンゾチオフェン構造、ベンゾオキサゾール構造、ベンゾオキサジアゾール構造、ベンゾチアゾール構造、ベンゾチアジアゾール構造、ベンゾトリアゾール構造、及び、これらの1種又は2種以上を含む構造から選択される。芳香族アミン構造は、好ましくはトリアリールアミン構造であり、より好ましくはトリフェニルアミン構造である。
上記具体例のうち、炭素数6~20のアルキル鎖を有する構造単位Lの例として、上記のうち、Rの少なくとも1つが炭素数6~20のアルキル鎖又は式(Ia)で表される構造であるものが挙げられる。
また、構造単位Lの例として、上述の、上記の式(1a)~(84a)及び(1)~(29)で表されるものも挙げられる。
構造単位Tは、ポリマー(A)の末端部を構成する1価の構造単位である。
構造単位Tは、特に限定されず、例えば、置換又は非置換の、芳香族炭化水素構造、芳香族複素環構造、及び、これらの1種又は2種以上を含む構造から選択される。芳香族複素環構造としては、チオフェン構造以外の構造が好ましい。
一実施形態において、構造単位Tは、電荷の輸送性を低下させずに耐久性を付与するという観点から、置換又は非置換の芳香族炭化水素構造であることが好ましく、置換又は非置換のベンゼン構造であることがより好ましい。また、他の実施形態において、後述するように、ポリマー(A)が末端部に重合性官能基を有する場合、構造単位Tは重合可能な構造(例えば、ピロール-イル基等の重合性官能基)であってもよい。
構造単位Tは、構造単位Lと同じ構造を有していても、又は、異なる構造を有していてもよい。
構造単位Bは、ポリマー(A)が分岐構造を有する場合に、分岐部を構成する3価以上の構造単位である。構造単位Bは、有機エレクトロニクス素子の耐久性向上の観点から、好ましくは6価以下であり、より好ましくは3価又は4価である。構造単位Bは、電荷輸送性を有する単位であることが好ましく、正孔輸送性を有することがより好ましい。構造単位Bは、例えば、置換又は非置換の、芳香族アミン構造、カルバゾール構造、チオフェン構造、フルオレン構造、フラン構造及び、これらの1種又は2種以上を含有する構造から選択されてもよい。例えば、構造単位Bは、有機エレクトロニクス素子の耐久性向上の観点から、置換又は非置換の、芳香族アミン構造、カルバゾール構造、縮合多環式芳香族炭化水素構造、及び、これらの1種又は2種以上を含有する構造から選択される。構造単位Bは、構造単位Lと同じ構造を有していても、又は、異なる構造を有していてもよく、また、構造単位Tと同じ構造を有していても、又は、異なる構造を有していてもよい。
炭素数6~20のアルキル鎖を有する場合の構造単位Bの例として、上記のうち、W、ベンゼン環又はArのいずれかが、置換基として炭素数6~20のアルキル鎖又は式(Ia)で表される構造を有するものが挙げられる。
構造単位Bの例として、上述の、上記の式(85a)~(93a)及び(1)~(32)で表されるものも挙げられる。
一実施形態においてポリマー(A)は、重合反応により硬化させ、溶剤への溶解度を変化させる観点から、重合性官能基(「重合可能な置換基」とも記す。)を少なくとも1つ有することが好ましい。「重合性官能基」とは、熱及び/又は光を加えることにより、互いに結合を形成し得る官能基をいう。
より具体的には、ポリマー(A)中の全構造単位に対する、正孔輸送性を有する構造単位L及び正孔輸送性を有する構造単位B(例えば、式(1a)~(93a)で表される構造単位)の割合は、10~95%が好ましく、25~90%がより好ましく、50~80%がさらに好ましい。
ポリマー(A)に含まれる構造単位Tの割合は、有機エレクトロニクス素子の特性向上の観点、又は、粘度の上昇を抑え、電荷輸送性ポリマーの合成を良好に行う観点から、全構造単位を基準として、5モル%以上が好ましく、10モル%以上がより好ましく、15モル%以上が更に好ましい。また、構造単位Tの割合は、十分な電荷輸送性を得る観点から、60モル%以下が好ましく、55モル%以下がより好ましく、50モル%以下が更に好ましい。
より具体的には、ポリマー(A)中の全構造単位に対する構造単位B(例えば、式(85a)~(93a)及び式(30)~(32)のいずれかで表される構造単位)の割合は、1~50モル%が好ましく、3~30モル%がより好ましく、10~25モル%がさらに好ましい。
ポリマー(A)の構造単位Lが炭素数6~20のアルキル鎖の有する構造単位を含む場合、ポリマー(A)の構造単位L中の、炭素数6~20のアルキル鎖の有する構造単位Lの割合は、例えば、20モル%以上が好ましく、40モル%以上がより好ましく、60モル%以上がさらに好ましい。ポリマー(A)の構造単位L中の、炭素数6~20のアルキル鎖の有する構造単位Lの割合は、例えば、100モル%であってよく、95モル%以下であってよく、90モル%以下であってよい。
また、鈴木反応では、Pd触媒として、一般的にPd(II)塩又はPd(0)錯体の形態の可溶性Pd化合物が用いられる。例えば、芳香族反応体を基準として0.01~5mol%のPd(Ph3P)4、3級ホスフィンリガンドとのPd(OAc)2錯体、Pd2(dba)3錯体及びPdCl2(dppf)錯体が好ましいPd源である。
有機エレクトロニクス材料は、有機エレクトロニクス材料の溶解度変化の観点から、開始剤をさらに含むことが好ましい。開始剤としては、有機エレクトロニクス材料中で酸化剤として作用し得る物質を用いることが可能である。ポリマー(A)に対して酸化剤として作用し得る物質を用いることは、正孔輸送性向上の観点から好ましい。開始剤としてはカチオンとアニオンからなるオニウム塩が組成物の溶解度の変化の観点から好ましく、以下その詳細について述べる。
カチオンとしては、例えば、H+、カルベニウムイオン、アンモニウムイオン、アニリニウムイオン、ピリジニウムイオン、イミダゾリウムイオン、ピロリジニウムイオン、キノリニウムイオン、イモニウムイオン、アミニウムイオン、オキソニウムイオン、ピリリウムイオン、クロメニリウム、キサンチリウムイオン、ヨードニウムイオン、スルホニウムイオン、ホスホニウムイオン、トロピリウムイオン、遷移金属を有するカチオンなどが挙げられ、カルベニウムイオン、アンモニムイオン、アニリニウムイオン、アミニウムイオン、ヨードニウムイオン、スルホニウムイオン、トロピリウムイオンが好ましい。耐溶剤性及び保存安定性との両立の観点から、アンモニウムイオン、アニリニウムイオン、ヨードニウムイオン、スルホニウムイオンがより好ましい。
アニオンとしては、例えば、F-、Cl-、Br-、I-などのハロゲンイオン;OH-;ClO4 -;FSO3 -、ClSO3 -、CH3SO3 -、C6H5SO3 -、CF3SO3 -などのスルホン酸イオン類;HSO4 -、SO4 2-などの硫酸イオン類;HCO3 -、CO3 2-などの炭酸イオン類;H2PO4 -、HPO4 2-、PO4 3-などのリン酸イオン類;PF6 -、PF5OH-などのフルオロリン酸イオン類;[(CF3CF2)3PF3]-、[(CF3CF2CF2)3PF3]-、[((CF3)2CF)3PF3]-、[((CF3)2CF)2PF4]-、[((CF3)2CFCF2)3PF3]-、[((CF3)2CFCF2)2PF4]-などのフッ素化アルキルフルオロリン酸イオン類;(CF3SO2)3C-、(CF3SO2)2N-などのフルオロアルカンスルホニルメチド、イミドイオン類;BF4 -、B(C6F5)4 -、B(C6H4CF3)4 -などのホウ酸イオン類;SbF6 -、SbF5OH-などのフルオロアンチモン酸イオン類;AsF6 -、AsF5OH-などのフルオロヒ素酸イオン類;AlCl4 -、BiF6 -等が挙げられる。前述のカチオンと組み合わせて用いたときの耐溶剤性の観点から、PF6 -、PF5OH-などのフルオロリン酸イオン類;[(CF3CF2)3PF3]-、[(CF3CF2CF2)3PF3]-、[((CF3)2CF)3PF3]-、[((CF3)2CF)2PF4]-、[((CF3)2CFCF2)3PF3]-、[((CF3)2CFCF2)2PF4]-などのフッ素化アルキルフルオロリン酸イオン類;(CF3SO2)3C-、(CF3SO2)2N-などのフルオロアルカンスルホニルメチド、イミドイオン類;BF4 -、B(C6F5)4 -、B(C6H4CF3)4 -などのホウ酸イオン類;SbF6 -、SbF5OH-などのフルオロアンチモン酸イオン類が好ましく、なかでもホウ酸イオン類が特に好ましい。
有機エレクトロニクス材料は、さらに溶媒を含んでいてもよい。溶媒としては、有機エレクトロニクス材料を用いて塗布層を形成することが可能な溶媒を用いることができ、好ましくはポリマー(A)及び開始剤を溶解しうる溶媒を用いることができる。
溶媒としては、例えば、水;メタノール、エタノール、イソプロピルアルコール等のアルコール;ペンタン、ヘキサン、オクタン等のアルカン;シクロヘキサン等の環状アルカン;ベンゼン、トルエン、キシレン、メシチレン、テトラリン、ジフェニルメタン等の芳香族炭化水素;エチレングリコールジメチルエーテル、エチレングリコールジエチルエーテル、プロピレングリコール-1-モノメチルエーテルアセタート等の脂肪族エーテル;1,2-ジメトキシベンゼン、1,3-ジメトキシベンゼン、アニソール、フェネトール、2-メトキシトルエン、3-メトキシトルエン、4-メトキシトルエン、2,3-ジメチルアニソール、2,4-ジメチルアニソール等の芳香族エーテル;酢酸エチル、酢酸n-ブチル、乳酸エチル、乳酸n-ブチル等の脂肪族エステル;酢酸フェニル、プロピオン酸フェニル、安息香酸メチル、安息香酸エチル、安息香酸プロピル、安息香酸n-ブチル等の芳香族エステル;N,N-ジメチルホルムアミド、N,N-ジメチルアセトアミド等のアミド系溶媒;ジメチルスルホキシド、テトラヒドロフラン、アセトン、クロロホルム、塩化メチレンなどが挙げられる。好ましくは芳香族炭化水素、脂肪族エステル、芳香族エステル、脂肪族エーテル、及び芳香族エーテルである。
また、本発明の実施形態は、前記有機エレクトロニクス材料を含むインク組成物に関する。
インク組成物とは、ポリマー(A)と、一般的には、これを溶解あるいは分散しうる溶媒とを含んでいればよい。好ましくは、ポリマー(A)と、開始剤と、これらを溶解あるいは分散しうる溶媒を含むことが好ましい。溶媒の例は上述のとおりである。
インク組成物は、さらに、任意成分として添加剤を含有してもよい。添加剤としては、例えば、重合禁止剤、安定剤、増粘剤、ゲル化剤、難燃剤、酸化防止剤、還元防止剤、酸化剤、還元剤、表面改質剤、乳化剤、消泡剤、分散剤、界面活性剤等が挙げられる。
インク組成物における溶媒の含有量は、種々の塗布方法へ適用することを考慮して定めることができる。例えば、溶媒の含有量は、溶媒に対しポリマー(A)の割合が、0.1質量%以上となる量が好ましく、0.2質量%以上となる量がより好ましく、0.5質量%以上となる量がさらに好ましい。また、溶媒の含有量は、溶媒に対しポリマー(A)の割合が、20質量%以下となる量が好ましく、15質量%以下となる量がより好ましく、10質量%以下となる量がさらに好ましい。
また、本発明の実施形態は、前記有機エレクトロニクス材料、又はインク組成物から形成した有機層に関する。有機層は、例えば、これらの組成物を塗布することにより形成した層に、熱、光、又は熱と光の両方を加えることにより、加える前とは異なる溶解度を有する有機層を得ることができる。
塗布の方法としては、例えば、インクジェット法、キャスト法、浸漬法、凸版印刷、凹版印刷、オフセット印刷、平板印刷、凸版反転オフセット印刷、スクリーン印刷、グラビア印刷等の印刷法、スピンコーティング法などの公知の方法が挙げられる。塗布は、通常、-20~+300℃の温度範囲、好ましくは10~100℃、特に好ましくは15~50℃で実施することができる。また、塗布後、得られた有機層を、ホットプレート又はオーブンによって、通常、+30~+300℃の温度範囲、好ましくは60~250℃、特に好ましくは80~220℃で乾燥させ、溶媒を除去してもよい。乾燥時間は、通常、10秒間~2時間、好ましくは1分間~1時間、特に好ましくは1~10分間である。
塗布により形成した有機層に、熱、光、又は熱と光の両方を加えることにより、加える前とは異なる溶解度を有する有機層を得ることができる。光及び/又は熱を加える条件(光照射及び/又は加熱の条件)は、前述のとおりである。有機層は溶媒に対する溶解性が低いために、有機層の上に別の有機層を塗布溶液を用いて容易に形成することができる。別の有機層を形成する際の塗布溶液に含まれる溶媒は、上述の溶媒(2)に限定されない。
また、本発明の実施形態は、上述の有機層を有する有機EL素子、有機光電変換素子等の有機エレクトロニクス素子に関する。有機エレクトロニクス素子は、少なくとも2つの電極、及び、電極の間に位置する有機層を有する。さらに、本発明の実施形態は、有機EL素子を用いた表示素子及び照明装置に関する。
本発明の実施形態の有機EL素子は、前記有機層を含む。有機EL素子は、通常、発光層、陽極、陰極、及び基板を備えており、正孔注入層、電子注入層、正孔輸送層、電子輸送層などの他の層を有していてもよい。有機EL素子は、少なくとも上述の有機層を有しており、例えば、有機層を発光層及び他の層として使用することができ、好ましくは正孔注入層及び/又は正孔輸送層として使用することができる。したがって、有機EL素子の例は、陽極、正孔注入層及び/又は正孔輸送層としての有機層、発光層、及び陰極をこの順に有し、さらにこれらの層の間に任意の層を有していてもよい。
図1は、有機EL素子の一実施形態を示す断面模式図である。図1の有機EL素子は、多層構造の素子であり、基板8、陽極2、正孔注入層3、正孔輸送層6、発光層1、電子輸送層7、電子注入層5、及び陰極4をこの順に有している。
以下、各層について詳細に説明する。
発光層に用いる材料としては、低分子化合物であっても、ポリマー又はオリゴマーであってもよく、デンドリマー等も使用可能である。蛍光発光を利用する低分子化合物としては、ペリレン、クマリン、ルブレン、キナクリドン、色素レーザー用色素(例えば、ローダミン、DCM1等)、アルミニウム錯体(例えば、Tris(8-hydroxyquinolinato)aluminum(III)(Alq3))、スチルベン、これらの誘導体などが挙げられる。蛍光発光を利用するポリマー又はオリゴマーとしては、ポリフルオレン、ポリフェニレン、ポリフェニレンビニレン(PPV)、ポリビニルカルバゾール(PVK)、フルオレン-ベンゾチアジアゾール共重合体、フルオレン-トリフェニルアミン共重合体、これらの誘導体及び混合物などが好適に利用できる。
陰極材料としては、例えば、Li、Ca、Mg、Al、In、Cs、Ba、Mg/Ag、LiF、CsF等の金属又は金属合金であることが好ましい。
陽極としては、金属(例えば、Au)又は金属導電率を有する他の材料を使用することができる。他の材料としては、例えば、酸化物(例えば、ITO:酸化インジウム/酸化錫)、導電性高分子(例えば、ポリチオフェン-ポリスチレンスルホン酸混合物(PEDOT:PSS))が挙げられる。
上記の組成物を用いて形成された有機層を、正孔注入層及び正孔輸送層の少なくとも一方として使用することが好ましい。有機EL素子が、上記の組成物を用いて形成された有機層を正孔注入層として有し、更に正孔輸送層を有する場合、正孔輸送層には公知の材料を使用できる。また、有機EL素子が、上記の組成物を用いて形成された有機層を正孔輸送層として有し、更に正孔注入層を有する場合、正孔注入層には公知の材料を使用できる。さらに、有機EL素子が、有機層を正孔注入輸送層として有してもよいし、2つの有機層を正孔注入層及び正孔輸送層として有してもよい。
電子輸送層及び電子注入層としては、例えば、フェナントロリン誘導体(例えば、2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline(BCP))、ビピリジン誘導体、ニトロ置換フルオレン誘導体、ジフェニルキノン誘導体、チオピランジオキシド誘導体、ナフタレン、ペリレンなどの縮合環テトラカルボン酸無水物、カルボジイミド、フルオレニリデンメタン誘導体、アントラキノジメタン及びアントロン誘導体、オキサジアゾール誘導体(例えば、2-(4-Biphenylyl)-5-(4-tert-butylphenyl-1,3,4-oxadiazole)(PBD))、アルミニウム錯体(例えば、Tris(8-hydroxyquinolinato)aluminum(III)(Alq3)、Bis(2-methyl-8-quninolinato)-4-phenylphenolate aluminum (III) (BAlq))などが挙げられる。さらに、上記オキサジアゾール誘導体において、オキサジアゾール環の酸素原子を硫黄原子に置換したチアジアゾール誘導体、電子吸引基として知られているキノキサリン環を有するキノキサリン誘導体も用いることができる。
有機EL素子に用いることができる基板として、ガラス、プラスチック等の種類は特に限定されることはない。また、透明の基板が好ましく、ガラス、石英、光透過性樹脂フィルム等が好ましく用いられる。樹脂フィルムを用いた場合には、有機EL素子にフレキシブル性を与えることが可能であり(つまり、フレキシブル基板)、特に好ましい。
樹脂フィルムとしては、例えばポリエチレンテレフタレート(PET)、ポリエチレンナフタレート(PEN)、ポリエーテルスルホン(PES)、ポリエーテルイミド、ポリエーテルエーテルケトン、ポリフェニレンスルフィド、ポリアリレート、ポリイミド、ポリカーボネート(PC)、セルローストリアセテート(TAC)、セルロースアセテートプロピオネート(CAP)等からなるフィルムが挙げられる。
また、樹脂フィルムを用いる場合、水蒸気、酸素等の透過を抑制するために、樹脂フィルムへ酸化珪素、窒化珪素等の無機物をコーティングして用いてもよい。
本発明の実施形態である有機EL素子は、外気の影響を低減させて長寿命化させるため、後述する光電変換素子と同様の方法により封止されていてもよい。
有機EL素子における発光色は特に限定されるものではないが、白色発光素子は家庭用照明、車内照明、時計又は液晶のバックライト等の各種照明器具に用いることができるため好ましい。
本発明の実施形態である表示素子は、既述の有機EL素子を備えている。
例えば、赤・緑・青(RGB)の各画素に対応する素子として、前記有機EL素子を用いることで、カラーの表示素子が得られる。
有機光電変換素子には、有機太陽電池及び有機光センサーが含まれ、通常、光電変換層、電極、及び基板を備えている。さらに、変換効率又は空気中の安定性を向上させる目的で、バッファ層、電子輸送層などの他の層を1種以上有していてもよい。有機光電変換素子は、少なくとも上述の有機層を有しており、有機層を光電変換層及びバッファ層として使用することができ、バッファ層として使用することが好ましい。したがって、有機光電変換素子の例は、陽極、バッファ層としての有機層、光電変換層、及び陰極をこの順に有し、さらにこれらの層の間に任意の層を有していてもよい。以下に有機光電変換素子の構成について記載する。
光電変換層には、光を吸収して電荷分離を起こし、起電力を発生するものであれば任意の材料を用いることができる。特に、変換効率の観点から、p型有機半導体と、n型有機半導体とをブレンドした混合物が好ましい。
p型有機半導体としては、例えば、オリゴチオフェン、ポリアルキルチオフェン、ポリ(3-ヘキシルチオフェン)(P3HT)、ポリフェニレンビニレン(PPV)等のポリマー又はオリゴマー;ポルフィリン、フタロシアニン、銅フタロシアニン;これらの誘導体等が好適に使用できる。
n型有機半導体としては、例えば、CN-ポリ(フェニレン-ビニレン)(CN-PPV)、MEH-CN-PPV、それらの-CF3置換ポリマー等の-CN基又はCF3基含有ポリマー又はオリゴマー;ポリ(フルオレン)誘導体、フルオレン-ベンゾチアジアゾール共重合体等のポリマー又はオリゴマー;フラーレン(C60)、[6,6]-Phenyl-C61-butyric acid methyl ester(PCBM)、[6,6]-Phenyl-C71-butyric acid methyl ester(PCBM)、ナフタレンテトラカルボン酸無水物(NTCDA)、ペリレンテトラカルボン酸無水物(PTCDA)、ナフタレンテトラカルボン酸ジイミド、ペリレンテトラカルボン酸ジイミド、キナクドリン;これらの誘導体等が好適に使用できる。
また、有機光電変換素子は、光電変換層以外に上述のバッファ層を有し、さらに電子輸送層などの層を有していてもよい。バッファ層としては、上述の有機層を用いることができ、電子輸送層としては、LiF、TiOx、ZnOx等が一般的に用いられる。
電極は、導電性を有するものであれば任意の材料を用いることが可能である。電極としては、例えば、白金、金、銀、アルミニウム、クロム、ニッケル、銅、チタン、マグネシウム、カルシウム、バリウム、ナトリウム、フッ化リチウム等の金属あるいはそれらの合金又は塩;酸化インジウム、酸化錫等の金属酸化物、あるいはその合金(ITO);ポリアニリン、ポリピロール、ポリチオフェン、ポリアセチレン等の導電性高分子;塩酸、硫酸、スルホン酸等の酸、FeCl3等のルイス酸、ヨウ素等のハロゲン原子、ナトリウム、カリウム等の金属原子などのドーパントを添加した前記導電性高分子;金属粒子、カーボンブラック、フラーレン、カーボンナノチューブ等の導電性粒子をポリマーバインダー等のマトリクスに分散した導電性の複合材料などが挙げられる。また、これらを組み合わせて用いてもよい。
また、電極は少なくとも一対(2個)設けられるが、少なくとも一方は透明電極である。透明電極としては、例えば、酸化インジウム錫(ITO)、酸化インジウム亜鉛(IZO)等の酸化物;金属薄膜;PEDOT:PSS等の導電性高分子などが挙げられる。
基板は、各層を支持できるものであれば任意の材料を用いることが可能である。基板としては、例えば、ガラス等の無機材料;ポリエチレンテレフタレート(PET)、ポリエチレンナフタレート(PEN)、ポリエーテルスルホン(PES)、ポリイミド(PI)、ポリエーテルイミド(PEI)、シクロオレフィンポリマー(COP)、ポリフェニレンサルファイド(PPS)、ナイロン、ポリスチレン、ポリエチレン、ポリプロピレン、ポリビニルアルコール、フッ素樹脂、塩化ビニル、セルロース、ポリ塩化ビニリデン、アラミド、ポリウレタン、ポリカーボネート、ポリアリレート、ポリノルボルネン、ポリ乳酸等の有機材料;絶縁性を付与するために表面をコートあるいはラミネートしたステンレス、チタン、アルミニウム等の金属等の複合材料などが挙げられる。また、ガスバリア性の付与のために、酸化珪素、窒化珪素等の無機物を積層した基板を用いてもよい。
本発明の実施形態である有機光電変換素子は、外気の影響を低減させて長寿命化させるため、封止されていてもよい。封止に用いる材料としては、ガラス、エポキシ樹脂、アクリル樹脂、PET、PEN等のプラスチックフィルム、酸化珪素、窒化珪素等の無機物等を用いることができる。
封止の方法としては、特に限定されないが、たとえば、真空蒸着、スパッタ、塗布法等により有機光電変換素子上に直接形成する方法、ガラス又はプラスチックフィルムを接着剤により有機光電変換素子に張り合わせる方法等が使用可能である。
<1> 正孔輸送性を有する構造単位を有し、かつ、炭素数6~20のアルキル鎖を有するポリマー又はオリゴマーを含む、有機エレクトロニクス材料。
<2> 前記正孔輸送性を有する構造単位が、芳香族アミン構造を含む構造単位、カルバゾール構造を含む構造単位、チオフェン構造を含む構造単位、フルオレン構造を含む構造単位、及びフラン構造を含む構造単位からなる群から選択される少なくとも1種の構造単位を含む、<1>に記載の有機エレクトロニクス材料。
<3> 前記ポリマー又はオリゴマーが、下記の式(Ia)で表される構造を有する、<1>又は<2>に記載の有機エレクトロニクス材料。
<4> 前記正孔輸送性を有する構造単位が、炭素数6~20のアルキル鎖を有する2価の構造単位を含む、<1>~<3>のいずれか1項に記載の有機エレクトロニクス材料。
<5> 前記ポリマー又はオリゴマーが、炭素数8~12のアルキル鎖を有する、<1>~<4>のいずれか1項に記載の有機エレクトロニクス材料。
<6> 前記ポリマー又はオリゴマーが分岐構造を有する、<1>~<5>のいずれか1項に記載の有機エレクトロニクス材料。
<7> 前記ポリマー又はオリゴマーが、分岐構造を形成する基点となる単位として下記一般式(1)~(10)の構造からなる群から選択される少なくとも1種を含む構造単位を含む、<6>に記載の有機エレクトロニクス材料。
<8> 前記ポリマー又はオリゴマーが少なくとも1つの重合性官能基を含む、<1>~<7>のいずれか1項に記載の有機エレクトロニクス材料。
<9> 開始剤をさらに含む、<1>~<8>のいずれか1項に記載の有機エレクトロニクス材料。
<10> <1>~<9>のいずれか1項に記載の有機エレクトロニクス材料と、溶媒とを含む、インク組成物。
<11> <1>~<9>のいずれか1項に記載の有機エレクトロニクス材料、又は<10>に記載のインク組成物を用いて形成された、有機層。
<12> <11>に記載の有機層を少なくとも一つ備える、有機エレクトロニクス素子。
<13> <11>に記載の有機層を少なくとも一つ備える、有機エレクトロルミネセンス素子。
<14> フレキシブル基板をさらに備える、<13>に記載の有機エレクトロルミネセンス素子。
<15> 樹脂フィルム基板を更に備える、<13>に記載の有機エレクトロルミネセンス素子。
<16> <13>~<15>のいずれか1項に記載の有機エレクトロルミネセンス素子を備えた、表示素子。
<17> <13>~<15>のいずれか1項に記載の有機エレクトロルミネセンス素子を備えた、照明装置。
<18> <17>に記載の照明装置と、表示手段として液晶素子とを備えた、表示装置。
<Pd触媒の調製>
窒素雰囲気下のグローブボックス中で、室温下、サンプル管にトリス(ジベンジリデンアセトン)ジパラジウム(73.2mg、80μmol)を秤取り、アニソール又はトルエン(15ml)を加え、30分間攪拌した。同様に、サンプル管にトリス(t-ブチル)ホスフィン(129.6mg、640μmol)を秤取り、アニソール(5mL)を加え、5分間攪拌した。これらの溶液を混合し、室温で30分間攪拌して、触媒の溶液(以下、「調製したPd触媒アニソール溶液」ともいう)を得た。なお、触媒の調製において、すべての溶媒は、30分以上窒素バブルにより脱気した後に使用した。
三口丸底フラスコに、下記(L)モノマー:モノマー1(5.0mmol)、下記(B)モノマー:モノマー2(2.0mmol)、下記(T1)モノマー:モノマー3(1.4mmol)、下記(T2)モノマー:モノマー4(2.6mmol)、及びアニソール(20mL)を加え、さらに、前記調製したPd触媒アニソール溶液(7.5mL)を加えた。30分撹拌した後、10%テトラエチルアンモニウム水酸化物水溶液(20mL)を追加した。この混合物を2時間、加熱還流した。なお、ここまでの全ての操作は、窒素気流下で行った。また、すべての溶媒は、30分以上窒素バブルにより脱気した後に使用した。下記モノマー1の式において、-C8H17は、n-オクチル基(炭素数8の直鎖アルキル基)である。
三口丸底フラスコに、(L1)モノマー:モノマー1(2.5mmol)、下記(L2)モノマー:モノマー5(2.5mmol)(B)モノマー:モノマー2(2.0mmol)、下記(T1)モノマー:モノマー3(1.4mmol)、下記(T2)モノマー:モノマー4(2.6mmol)、及びアニソール(20mL)を加え、さらに、前記調製したPd触媒アニソール溶液(7.5mL)を加えた。30分撹拌した後、10%テトラエチルアンモニウム水酸化物水溶液(20mL)を追加した。この混合物を2時間、加熱還流した。なお、ここまでの全ての操作は、窒素気流下で行った。また、すべての溶媒は、30分以上窒素バブルにより脱気した後に使用した。以降は上記電荷輸送性ポリマー1と同様に精製処理を行い、電荷輸送性ポリマー5を得た。下記モノマー5の式において、-C4H9は、n-ブチル基(炭素数4の直鎖アルキル基)である。
三口丸底フラスコに、下記(L)モノマー:モノマー5(5.0mmol)、下記(B)モノマー:モノマー2(2.0mmol)、下記(T1)モノマー:モノマー3(2.0mmol)、下記(T2)モノマー:モノマー4(2.0mmol)、及びアニソール(20mL)を加え、さらに、前記調製したPd触媒アニソール溶液(7.5mL)を加えた。30分撹拌した後、10%テトラエチルアンモニウム水酸化物水溶液(20mL)を追加した。この混合物を2時間、加熱還流した。なお、ここまでの全ての操作は、窒素気流下で行った。また、すべての溶媒は、30分以上窒素バブルにより脱気した後に使用した。以降は上記電荷輸送性ポリマー1と同様に精製処理を行い、電荷輸送性ポリマー13を得た。
三口丸底フラスコに、下記(L)モノマー:モノマー5(5.0mmol)、下記(B)モノマー:モノマー7(2.0mmol)、下記(T)モノマー:モノマー8(4.0mmol)、及びトルエン(20mL)を加え、さらに、前記調製したPd触媒トルエン溶液(7.5mL)を加えた。30分撹拌した後、3M水酸化カリウム水溶液(10mL)を追加した。この混合物を2時間、加熱還流した。なお、ここまでの全ての操作は、窒素気流下で行った。また、すべての溶媒は、30分以上窒素バブルにより脱気した後に使用した。以降は上記電荷輸送性ポリマー1と同様に精製処理を行い、電荷輸送性ポリマー13を得た。合成に用いたモノマ及びその配合比率は異なるため下記表4に示す。
装置:高速液体クロマトグラフ Prominence(株)島津製作所
送液ポンプ(LC-20AD)
脱気ユニット(DGU-20A)
オートサンプラ(SIL-20AHT)
カラムオーブン(CTO-20A)
PDA検出器(SPD-M20A)
示差屈折率検出器(RID-20A)
カラム:Gelpack(登録商標)
GL-A160S(製造番号:686-1J27)
GL-A150S(製造番号:685-1J27)日立化成(株)
溶離液:テトラヒドロフラン(THF)(HPLC用、安定剤含有)和光純薬工業(株)
流速:1mL/min
カラム温度:40℃
検出波長:254nm
分子量標準物質:PStQuick A/B/C 東ソー(株)
<低分子量成分>
はじめに、GPC(ゲルパーミエーションクロマトグラフィ)を用いて規定される、電荷輸送性ポリマーの低分子量成分の成分比率の求め方について説明する。「GPCにより測定される分子量分布チャートにおいて、分子量20,000未満の成分(すなわち低分子量成分)」を低分子比率とし、後述するポリスチレン換算分子量で規定することができる。なお、全チャート面積は、溶媒及び不純物ピークを除いたピーク全体の面積である。
[実施例1]
電荷輸送性ポリマー1(10mg)を1100μLのトルエンに溶解させた溶液と、開始剤として、下記化学式で表されるイオン性化合物1(1mg)を50μLのトルエンに溶解させた溶液を混合した塗布溶液を、3000rpmで石英板上にスピンコートした。ついで、ホットプレート上で、200℃で10分間加熱して重合反応を行った。加熱後にトルエン溶媒に石英板を10秒間浸漬し、洗浄を行った。
洗浄前:λmax=358nm 、 Abs=0.429
洗浄後:λmax=358nm 、 Abs=0.445
残膜率(%)=洗浄後Abs/洗浄前Abs×100
=(0.445/0.429)×100=103.7
装置:U-3900H形分光光度計(日立ハイテクノロジーズ)
スリット:2nm
スキャンスピード:600nm/min
開始波長:500nm
終了波長:250nm
リファレンス:石英基板
電荷輸送性ポリマー1に代えて、下記表2に示すいずれかの電荷輸送性ポリマーを用いた以外は、上記実施例1と同様にして有機層を形成し、その残膜率を測定した。結果を表6に示す。
このように実施例では、重合性官能基の配合量が同一にも関わらず、炭素数6~20のアルキル鎖を有するとき、耐溶剤性の向上を達成できた。
電荷輸送性ポリマー1(10mg)を1100μLのトルエンに溶解させた溶液と、上記イオン性化合物1(1mg)を50μLのトルエンに溶解させた溶液を混合した塗布溶液を、3000rpmで石英板上にスピンコートした。ついで、ホットプレート上で、230℃で30分間加熱して重合反応を行った。加熱後にトルエン溶媒に石英板を10秒間浸漬し、洗浄を行った。
洗浄前:λmax=357nm 、 Abs=0.313
洗浄後:λmax=355nm 、 Abs=0.316
残膜率(%)=洗浄後Abs/洗浄前Abs×100
=(0.316/0.313)×100=101.0
装置:U-3900H形分光光度計(日立ハイテクノロジーズ)
スリット:2nm
スキャンスピード:600nm/min
開始波長:500nm
終了波長:250nm
リファレンス:石英基板
電荷輸送性ポリマー1に代えて、下記表3に示すいずれかの電荷輸送性ポリマーを用いた以外は、上記実施例11と同様にして有機層を形成し、その残膜率を測定した。結果を表7に示す。
[実施例3-1]
ITOを1.6mm幅にパターンニングしたガラス基板上に、電荷輸送ポリマー14を、回転速度3000min-1でスピン塗布し、ホットプレート上で空気中、200℃/10分加熱乾燥して、正孔注入層(40nm)を形成した。以後の実験は乾燥窒素環境下で行った。
電荷輸送性ポリマー1の代わりに表8に示すいずれかのポリマーを用いて正孔輸送層を形成した以外は、実施例3-1と同様にして有機EL素子を作製した。
また実施例3-5と実施例3-6との比較、及び、実施例3-7と実施例3-8との比較では、(T)モノマー中の重合性官能基を有するモノマー3の割合が少ないほど長い発光寿命を示すことがわかる。すなわち、モノマー1を用いて、十分な耐溶剤性を保持したまま、(T)モノマー中のモノマー3の割合を低減することに成功し、その電荷輸送性ポリマーを用いることによって、発光効率及び発光寿命の向上という格別の効果が得られた。
2 陽極
3 正孔注入層
4 陰極
5 電子注入層
6 正孔輸送層
7 電子輸送層
8 基板
Claims (18)
- 正孔輸送性を有する構造単位を有し、かつ、炭素数6~20のアルキル鎖を有するポリマー又はオリゴマーを含む、有機エレクトロニクス材料。
- 前記正孔輸送性を有する構造単位が、芳香族アミン構造を含む構造単位、カルバゾール構造を含む構造単位、チオフェン構造を含む構造単位、フルオレン構造を含む構造単位、及びフラン構造を含む構造単位からなる群から選択される少なくとも1種の構造単位を含む、請求項1に記載の有機エレクトロニクス材料。
- 前記正孔輸送性を有する構造単位が、炭素数6~20のアルキル鎖を有する2価の構造単位を含む、請求項1~3のいずれか1項に記載の有機エレクトロニクス材料。
- 前記ポリマー又はオリゴマーが、炭素数8~12のアルキル鎖を有する、請求項1~4のいずれか1項に記載の有機エレクトロニクス材料。
- 前記ポリマー又はオリゴマーが分岐構造を有する、請求項1~5のいずれか1項に記載の有機エレクトロニクス材料。
- 前記ポリマー又はオリゴマーが少なくとも1つの重合性官能基を含む、請求項1~7のいずれか1項に記載の有機エレクトロニクス材料。
- 開始剤をさらに含む、請求項1~8のいずれか1項に記載の有機エレクトロニクス材料。
- 請求項1~9のいずれか1項に記載の有機エレクトロニクス材料と、溶媒とを含む、インク組成物。
- 請求項1~9のいずれか1項に記載の有機エレクトロニクス材料、又は請求項10に記載のインク組成物を用いて形成された、有機層。
- 請求項11に記載の有機層を少なくとも一つ備える、有機エレクトロニクス素子。
- 請求項11に記載の有機層を少なくとも一つ備える、有機エレクトロルミネセンス素子。
- フレキシブル基板をさらに備える、請求項13に記載の有機エレクトロルミネセンス素子。
- 樹脂フィルム基板を更に備える、請求項13に記載の有機エレクトロルミネセンス素子。
- 請求項13~15のいずれか1項に記載の有機エレクトロルミネセンス素子を備えた、表示素子。
- 請求項13~15のいずれか1項に記載の有機エレクトロルミネセンス素子を備えた、照明装置。
- 請求項17に記載の照明装置と、表示手段として液晶素子とを備えた、表示装置。
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KR102541669B1 (ko) * | 2015-05-12 | 2023-06-08 | 메르크 파텐트 게엠베하 | 티아디아졸로피리딘 중합체, 이의 합성 및 이의 용도 |
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2017
- 2017-03-24 US US16/496,892 patent/US20200106018A1/en not_active Abandoned
- 2017-03-24 EP EP17901824.7A patent/EP3605633A1/en not_active Withdrawn
- 2017-03-24 KR KR1020197027604A patent/KR20190129051A/ko not_active Withdrawn
- 2017-03-24 WO PCT/JP2017/012068 patent/WO2018173265A1/ja unknown
- 2017-03-24 JP JP2019506896A patent/JP6827654B2/ja not_active Expired - Fee Related
- 2017-03-24 CN CN201780088807.7A patent/CN110495004A/zh active Pending
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Also Published As
Publication number | Publication date |
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US20200106018A1 (en) | 2020-04-02 |
CN110495004A (zh) | 2019-11-22 |
KR20190129051A (ko) | 2019-11-19 |
EP3605633A1 (en) | 2020-02-05 |
JPWO2018173265A1 (ja) | 2020-01-23 |
JP6827654B2 (ja) | 2021-02-10 |
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