WO2008026649A1 - Organic electroluminescence element - Google Patents
Organic electroluminescence element Download PDFInfo
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- WO2008026649A1 WO2008026649A1 PCT/JP2007/066792 JP2007066792W WO2008026649A1 WO 2008026649 A1 WO2008026649 A1 WO 2008026649A1 JP 2007066792 W JP2007066792 W JP 2007066792W WO 2008026649 A1 WO2008026649 A1 WO 2008026649A1
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- Prior art keywords
- electrode
- organic
- array
- auxiliary electrode
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- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- 239000005453 ketone based solvent Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- GCICAPWZNUIIDV-UHFFFAOYSA-N lithium magnesium Chemical compound [Li].[Mg] GCICAPWZNUIIDV-UHFFFAOYSA-N 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- SJCKRGFTWFGHGZ-UHFFFAOYSA-N magnesium silver Chemical compound [Mg].[Ag] SJCKRGFTWFGHGZ-UHFFFAOYSA-N 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052976 metal sulfide Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- UZKWTJUDCOPSNM-UHFFFAOYSA-N methoxybenzene Substances CCCCOC=C UZKWTJUDCOPSNM-UHFFFAOYSA-N 0.000 description 1
- WBYWAXJHAXSJNI-UHFFFAOYSA-N methyl p-hydroxycinnamate Natural products OC(=O)C=CC1=CC=CC=C1 WBYWAXJHAXSJNI-UHFFFAOYSA-N 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000012454 non-polar solvent Substances 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
- 239000012074 organic phase Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- AICOOMRHRUFYCM-ZRRPKQBOSA-N oxazine, 1 Chemical compound C([C@@H]1[C@H](C(C[C@]2(C)[C@@H]([C@H](C)N(C)C)[C@H](O)C[C@]21C)=O)CC1=CC2)C[C@H]1[C@@]1(C)[C@H]2N=C(C(C)C)OC1 AICOOMRHRUFYCM-ZRRPKQBOSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- YJVFFLUZDVXJQI-UHFFFAOYSA-L palladium(ii) acetate Chemical compound [Pd+2].CC([O-])=O.CC([O-])=O YJVFFLUZDVXJQI-UHFFFAOYSA-L 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- HXITXNWTGFUOAU-UHFFFAOYSA-N phenylboronic acid Chemical compound OB(O)C1=CC=CC=C1 HXITXNWTGFUOAU-UHFFFAOYSA-N 0.000 description 1
- 229910000073 phosphorus hydride Inorganic materials 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920001467 poly(styrenesulfonates) Polymers 0.000 description 1
- 229920000172 poly(styrenesulfonic acid) Polymers 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920002098 polyfluorene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229960002796 polystyrene sulfonate Drugs 0.000 description 1
- 239000011970 polystyrene sulfonate Substances 0.000 description 1
- 229940005642 polystyrene sulfonic acid Drugs 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- 238000011403 purification operation Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000001226 reprecipitation Methods 0.000 description 1
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 description 1
- 229910052706 scandium Inorganic materials 0.000 description 1
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 description 1
- 238000013077 scoring method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 235000020238 sunflower seed Nutrition 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- GZCRRIHWUXGPOV-UHFFFAOYSA-N terbium atom Chemical compound [Tb] GZCRRIHWUXGPOV-UHFFFAOYSA-N 0.000 description 1
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- PXXNTAGJWPJAGM-UHFFFAOYSA-N vertaline Natural products C1C2C=3C=C(OC)C(OC)=CC=3OC(C=C3)=CC=C3CCC(=O)OC1CC1N2CCCC1 PXXNTAGJWPJAGM-UHFFFAOYSA-N 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/805—Electrodes
- H10K50/81—Anodes
- H10K50/814—Anodes combined with auxiliary electrodes, e.g. ITO layer combined with metal lines
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10F77/00—Constructional details of devices covered by this subclass
- H10F77/20—Electrodes
- H10F77/244—Electrodes made of transparent conductive layers, e.g. transparent conductive oxide [TCO] layers
- H10F77/247—Electrodes made of transparent conductive layers, e.g. transparent conductive oxide [TCO] layers comprising indium tin oxide [ITO]
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/805—Electrodes
- H10K50/81—Anodes
- H10K50/813—Anodes characterised by their shape
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/856—Arrangements for extracting light from the devices comprising reflective means
Definitions
- the present invention relates to an organic electoluminescence element useful as a light-emitting element used in a planar light source, a segment display device, a dot matrix display device, a liquid crystal display device and the like.
- organic fluorescent dyes are used as light emitting layers, and organic materials having a two-layer structure in which organic charge transport compounds used in electrophotographic photoreceptors are laminated.
- organic EL elements electoric luminescence elements
- Patent Document Japanese Patent Laid-Open No. 2004-14128
- Patent Document 1 Japanese Unexamined Patent Application Publication No. 2004-14128
- the present invention has been made in view of the above-described problems of the prior art, and can reduce the voltage drop due to the resistance of the transparent electrode or the translucent electrode, and can emit light uniformly, and can reflect external light.
- An object is to provide an oral luminescence element.
- the present inventor has made a first electrode composed of a transparent electrode or a semi-transparent electrode, a second electrode facing the first electrode, and the first electrode.
- an organic electoluminescence device comprising an electrode and at least one organic layer provided between the second electrode, a specific order having no periodic regularity on the surface of the first electrode
- the auxiliary electrode By forming the auxiliary electrode with the opening based on the arrangement, it is possible to reduce the voltage drop due to the resistance of the transparent electrode or the semi-transparent electrode and to emit light uniformly, and to add color when reflecting external light.
- the inventors have found that generation of moire fringes due to interference can be sufficiently suppressed, and have completed the present invention.
- the organic electoluminescence device of the present invention includes a first electrode made of a transparent electrode or a semitransparent electrode, a second electrode facing the first electrode, the first electrode, and the second electrode.
- An organic-electric-luminescence element comprising at least one organic layer provided between
- An auxiliary electrode that is electrically connected to the first electrode, has an electrical resistance value lower than that of the first electrode, and has a material force;
- the auxiliary electrode is formed on the surface of the first electrode such that a region defined based on a lattice point defined by a quasi-periodic two-dimensional array is the opening. That is the ecstasy.
- the auxiliary electrode has a Polonoi boundary by the Voronoi division so that the Polonoi region by the Polonoi division having the lattice point as a generating point is an opening. Formed on! /
- the auxiliary electrode has the Delaunay one in which the region of the Delaunay triangle by the Delaunay triangulation with the lattice point as a generating point is an opening. It may be formed on one side of the Delaunay by triangulation.
- the quasi-periodic two-dimensional array is arranged similar to or similar to the Fibonacci sequence, that is, an array using a Fibonacci array. I prefer to be there. Furthermore, in the organic electoluminescence device of the present invention, the quasi-periodic two-dimensional array is extracted from the Fibonacci array so that the average inter-lattice distance of the lattice points is in the range of 10 to 30 m. It is preferable that the unit arrays are arranged in such a manner that the unit arrays do not overlap each other! /.
- the unit array may be an array extracted from the Fibonacci array so that the order in the Fibonacci sequence is 300 to 1000. preferable.
- the auxiliary electrode is disposed on the surface of the first electrode opposite to the organic layer.
- the first electrode is partitioned into a plurality of electrically separated cells, and each of the plurality of cells is electrically connected by the auxiliary electrode. Connected to! /, The power of being S preferred.
- a planar light source of the present invention is characterized by including the organic electoluminescence device.
- a segment display device of the present invention is characterized by including the organic-elect mouth luminescence element.
- the dot matrix display device of the present invention is characterized by comprising the organic electoluminescence device.
- a liquid crystal display device of the present invention includes the organic electoluminescence device.
- the voltage drop due to the resistance of the transparent electrode or the semi-transparent electrode can be reduced, and the light can be emitted uniformly, and also due to coloring or interference during reflection of external light. Generation of moire fringes can be sufficiently suppressed.
- an auxiliary electrode electrically connected to the first electrode is formed on the surface of the first electrode made of a transparent electrode or a semitransparent electrode. . Since the auxiliary electrode is made of a material having a low electric resistance value (high electric conductivity) compared to the first electrode, according to the present invention, the voltage drop due to the resistance of the first electrode Can be reduced.
- the auxiliary electrode is usually made of a material that blocks light, such as a metal, The light emitted from the mechanical layer is blocked by the auxiliary electrode, and the light is extracted from the opening provided in the auxiliary electrode. Then, when the auxiliary electrode having the openings periodically formed on the surface of the first electrode is formed, as in the case where the auxiliary electrode is formed in a lattice shape, a stripe shape, or the like. Due to the periodic regularity, moire fringes due to coloring or interference during external light reflection occur.
- the auxiliary electrode is formed such that an area defined based on a lattice point defined by a quasi-periodic two-dimensional array is an opening. There is no periodic regularity on the surface of the electrode! / Auxiliary electrodes with openings are formed on the basis of a specific ordered arrangement. Generation of moire fringes due to interference is sufficiently suppressed.
- the openings are provided based on the specific order arrangement as described above, unlike the case where the openings are provided randomly, the openings are provided in the auxiliary electrode.
- the unevenness of the light emission luminance due to the uneven density (aperture ratio) of the openings is also sufficiently suppressed. Therefore, according to the organic electoluminescence device of the present invention, uniform light emission is possible.
- the first electrode is cut into a plurality of electrically separated cells, and the plurality of cells are electrically connected to each other by the auxiliary electrode.
- the emission luminance can be improved. That is, by dividing the first electrode into a plurality of electrically separated cells, it is possible to suppress the light emitting component that is guided in the surface direction of the first electrode, and to improve the light emission luminance. .
- the plurality of cells are electrically connected to each other by the auxiliary electrode, unevenness in light emission luminance among the plurality of cells is sufficiently suppressed.
- the organic electoluminescence device of the present invention includes a first electrode composed of a transparent electrode or a translucent electrode, a second electrode facing the first electrode, and between the first electrode and the second electrode.
- An organic electoluminescence device comprising at least one organic layer provided,
- An auxiliary electrode that is electrically connected to the first electrode, has an electrical resistance value lower than that of the first electrode, and has a material force;
- the auxiliary electrode is formed on the surface of the first electrode such that a region defined based on a lattice point defined by a quasi-periodic two-dimensional array is the opening. That's what you do.
- the first electrode according to the present invention is an electrode composed of a transparent electrode or a semi-transparent electrode and serves as an anode of the organic electoluminescence device of the present invention.
- a metal oxide, metal sulfide or metal thin film with high electrical conductivity can be used, and a high transmittance can be suitably used, and it can be appropriately selected depending on the organic layer to be used.
- the power S can be used.
- the material for the first electrode include indium oxide, zinc oxide, tin oxide, and conductive glass composed of indium 'tin' oxide (ITO), indium 'zinc oxide, etc., which are composites thereof. (NESA, etc.), gold, platinum, silver and copper are used. Of these, ITO, indium / zinc / oxide, and tin oxide are preferable.
- the film thickness of the first electrode is a force that can be appropriately selected in consideration of light transmission and electrical conductivity, for example, 101 111 to 10 111, preferably 201 111 to 1 111. More preferably, it is 50 nm to 500 nm.
- the interval between adjacent cells is;! -50 m, preferably 5 ⁇ 30 111. If the distance between adjacent cells is less than the lower limit, the light guided in the surface direction of the first electrode tends not to be sufficiently suppressed. On the other hand, if the upper limit is exceeded, the actual light emitting area is reduced. Since it becomes smaller, the luminous efficiency tends to decrease.
- the shape of the plurality of cells thus electrically separated is not particularly limited. Examples thereof include a rectangular shape such as a stripe shape, a triangular shape, and a quadrangular shape.
- the shape of the plurality of cells is preferably a shape similar to the shape of the opening of the auxiliary electrode described later, from the viewpoint of ensuring electrical connection between adjacent cells.
- a first electrode was formed in producing the organic electoluminescence device of the present invention.
- the material to be formed later (for example, auxiliary electrode, organic layer) is filled between adjacent cells.
- Examples of the method for forming the first electrode as described above include a vacuum deposition method, a sputtering method, an ion plating method, and a plating method.
- Examples of a method of partitioning such a first electrode into a plurality of electrically separated cells include a method of forming a pattern by an etching method using a photoresist after forming the first electrode.
- a transparent conductive film made of an organic material such as polyaniline or a derivative thereof, polythiophene, or a derivative thereof may be used.
- a conductive polymer such as a phthalocyanine derivative or a polythiophene derivative, Mo oxide, amorphous carbon is formed on the surface of the first electrode on the organic layer side.
- a 1 to 200 nm layer of carbon fluoride, polyamine compound or the like, or a layer having an average film thickness of 10 nm or less made of metal oxide, metal fluoride, organic insulating material, or the like may be provided.
- an auxiliary electrode electrically connected to the first electrode and provided with an opening.
- Such an auxiliary electrode is formed on the surface of the first electrode so that a region defined based on a lattice point defined by a quasi-periodic two-dimensional array is the opening. It is necessary.
- by providing such an auxiliary electrode it is possible to reduce the voltage drop due to the resistance of the transparent electrode or the semi-transparent electrode and to emit light uniformly, and further, coloring and interference when reflecting external light. It is possible to sufficiently suppress the occurrence of moire fringes.
- the quasi-periodic two-dimensional array according to the present invention refers to an ordered array of a type different from the periodic array, and includes, for example, a Fibonacci array.
- Fibonacci arrays are arrays that are similar or similar to the Fibonacci sequence, such as sunflower seeds and pinecone arrays, which are roughly spirals as shown in Fig. 1. This refers to an array that exhibits a shape.
- the grid points defined by the Fibonacci array include those obtained by removing some of the grid points from the Fibonacci sequence.
- Fibonacci array is an integer n
- the quasi-periodic two-dimensional array according to the present invention has an average inter-lattice distance of 10 to 30 m, preferably 10 to 20 111). It is preferable that the unit array is extracted from the Fibonacci array so as to be in the range, and the unit arrays are arranged so as not to overlap each other.
- an opening of the auxiliary electrode in a region defined based on the lattice point defined by such a quasi-periodic two-dimensional array an increase in the wiring resistance between the auxiliary electrodes is suppressed, and the auxiliary electrode is formed. The periodic regularity of the provided opening can be eliminated.
- the interstitial distance between adjacent lattice points among the lattice points defined by the Fibonacci arrangement is in the range of 5 to ⁇ ⁇ ⁇ .
- the shape of the unit array extracted from the Fibonacci array is not particularly limited, but from the viewpoint of laying out the unit arrays so as not to overlap each other, a polygonal shape is used. Triangles, squares, rectangles, regular hexagons, etc. are preferred (see FIGS. 2 to 4).
- A represents the region of order 300 or less in the Fibonacci sequence
- B represents the region of order 1000 or less in the Fibonacci sequence.
- such a unit array has an order of 300 to 1000 in the Fibonacci sequence.
- Fibonacci preferably, it is a sequence extracted from the Fibonacci sequence so as to be in the range of 500 to 800.
- the order in the Fibonacci sequence is in the above range, it is possible to suppress the dispersion of the distance between the lattice points defined by one unit array, and the variation in the wiring resistance between the auxiliary electrodes can be suppressed.
- unevenness in light emission luminance due to deviation in the density (aperture ratio) of the openings can be more reliably suppressed.
- such a unit array is extracted from the Fibonacci array so that the number of lattice points defined by one unit array is in the range of 50 to 200 (more preferably, 50 to; 100).
- the sequence is Furthermore, in the present invention, from the viewpoint of more reliably eliminating the periodic regularity of the openings provided in the auxiliary electrode, a plurality of different unit arrays extracted from different locations in the Fibonacci array are provided. It's better to lay out so that they overlap each other!
- the auxiliary electrode according to the present invention is formed such that an area defined based on a lattice point defined by the quasi-periodic two-dimensional array as described above is an opening. Such a region is determined by a force S determined by Polonoy division, Delaunay triangulation, etc. with the lattice point as a generating point.
- Polonoi division is V, a region (polonoi region) that is formed by connecting a vertical bisector between any adjacent generating points to a plane on which several points (generating points) are arranged. It means dividing.
- the boundary line of the Polonoi region is called the Polonoi boundary.
- the auxiliary electrode according to the present invention is based on the Polonoi division so that the Polonoy region by the Polonoi division having the lattice point as a generating point becomes an opening. Formed on (along) the Poronoi boundary.
- Delaunay triangulation is a triangular region formed by connecting a line (Drone's side) connecting the base points of adjacent Voronoi regions to a plane on which several points (base points) are arranged. This is to divide into (Droney triangle area). Due to such Delaunay triangulation, In the case of defining an area, the auxiliary electrode according to the present invention is based on the Delaunay triangulation so that the Delaunay triangulation area by the Delaunay triangulation with the lattice point as a generating point becomes an opening. Formed on (along) one side of the Delaunay.
- the line width of such an auxiliary electrode is preferably in the range of 1 to 200 Hm, and more preferably in the range of 10 to 100 m, from the viewpoint of light utilization efficiency.
- the material of such an auxiliary electrode wherein if the electrical conductivity is higher than the material of the first electrode (if the electrical resistance is lower) is not particularly limited, usually 10 7 S / cm or more electrical A conductive material having conductivity is used, and metal materials such as aluminum, silver, chromium, gold, copper, and tantalum are preferably used. Among these, aluminum, chromium, copper, and silver are more preferable from the viewpoints of high electrical conductivity and ease of material handling.
- the ratio of the area covered by the auxiliary electrode to the light emitting area of the element is 20 to 20 A range of 90% is preferred. A range of 30-80% is more preferred.
- the thickness of such an auxiliary electrode is a force that can be appropriately selected so that the sheet resistance becomes a desired value, for example, 10 to 500 nm, preferably 20 to 300 nm, and more preferably 50-150.
- auxiliary electrode is arranged on the surface of the first electrode on the surface of the organic layer side! /, May! /, But the first electrode and the auxiliary electrode From the standpoint of ensuring the electrical connection of! /, It is preferable to be disposed on the surface opposite to the organic layer.
- a method of forming the auxiliary electrode as described above for example, after forming a film of the material of the auxiliary electrode by a vacuum deposition method, a scoring method, or a laminating method in which a metal thin film is thermocompression bonded, A method of forming a pattern by an etching method using a photoresist is mentioned.
- the 2nd electrode concerning this invention is an electrode arrange
- a material for such a second electrode a material having a low work function is preferable.
- One or more alloys; or one or more of them and one or more of gold, silver, platinum, copper, mangan, titanium, cobalt, nickel, tungsten, tin; a graph item or a graph Aito intercalation compounds are used.
- these alloys include magnesium-silver alloy, magnesium-indium alloy, magnesium-aluminum alloy, indium-mug alloy, lithium-aluminum alloy, lithium-magnesium alloy, lithium-indium alloy, and calcium-aluminum alloy.
- the film thickness of such a second electrode can be appropriately selected in consideration of electric conductivity and durability.
- lOnm ⁇ ; lO ⁇ m preferably 20nm ⁇ lm. More preferably, it is 50 nm to 500 nm.
- Examples of the method for forming the second electrode as described above include a vacuum deposition method, a sputtering method, and a laminating method in which a metal thin film is thermocompression bonded.
- a second electrode may have a laminated structure of two or more layers.
- a layer made of a conductive polymer or a layer made of a metal oxide, a metal fluoride, an organic insulating material or the like with an average film thickness of lOnm or less may be provided between the second electrode and the organic layer.
- the organic layer according to the present invention is a layer provided between the first electrode and the second electrode.
- Such an organic layer is usually a layer containing at least one luminescent material, but may be composed of a plurality of layers.
- the operation of an organic electoluminescence device essentially consists of the process of injecting electrons and holes from the electrode, the process of electrons and holes moving through the organic layer, and the recombination of electrons and holes into a singlet. It consists of a process of generating excitons or triplet excitons and a process of emitting the excitons.
- the organic layer is composed of multiple layers, the functions required in each process are And can be optimized independently for each material.
- examples of the light emission color of such an organic layer include intermediate color and white light emission.
- Full color The element preferably emits three primary colors, and the planar light source emits white or intermediate colors.
- a polymer light emitting material (ii) which is composed only of the low molecular light emitting material (i) can be used as the light emitting material used in such an organic layer.
- the other materials used in the organic layer are different. Therefore, the case of using the low molecular weight light emitting material ⁇ and the case of using the polymer light emitting material ( ⁇ ) are described below. Each will be explained separately.
- the organic layer material in the case of using low-molecular-weight luminescent materials is “Organic EL Display” (Co-authored by Shizuo Tokito, Chinamiya Adachi, Hideyuki Murata, Ohm Co., Ltd., 2004, first edition, first edition) Fluorescent and phosphorescent materials, hole transport materials, electron block materials, hole block materials, and electron transport materials described on pages 48, 83 to 99, 10;! To 120 are listed. Specifically, as hole transport materials, JP-A-63-70257, JP-A-63-175860, JP-A-2-135359, JP-A-2-135361, JP-A-2-209988. 2-315991, 3-37992, 3-152184, 11-35687, 11-217392, and JP 2000-80167! / Are exemplified.
- examples of the low molecular weight light emitting material include Ir (ppy), Btp Ir (acac) having iridium as a central metal, PtOEP having euro as a central metal, and europium.
- the thickness of the layer containing the material of these organic layers is generally a force of 5 to 200 nm that is appropriately selected so that the light emission efficiency and the driving voltage have desired values.
- the thickness of the hole transport layer is, for example, 10 to 100 nm, preferably 20 to 80 nm.
- Light emitting layer thickness Is for example, 10 to 100 nm, preferably 20 to 80 nm.
- the thickness of the hole blocking layer is, for example, 5 to 50 nm, preferably 10 to 30 nm.
- the thickness of the electron injection layer is, for example, 10 to;! OOnm, preferably 20 to 80 nm.
- a material in which these layers are soluble can form a emulsion.
- a method of forming a film by a coating method or a printing method described later can be mentioned.
- an organic electroluminescence device can be constructed with a structure in which the charge injection layer and the charge transport layer are laminated.
- a layer containing a conductive polymer or provided between the first electrode and the hole transport layer, the material of the first electrode and the hole transport layer are provided.
- a layer including a material having an ionization potential of an intermediate value with respect to the included hole transporting material, provided between the second electrode and the electron transport layer, and included in the material of the second electrode and the electron transport layer examples include a layer containing a material having an electron affinity that is intermediate to that of the electron transporting material.
- a charge injection layer is a layer containing a conductive polymer
- the layer containing the conductive polymer is between at least one electrode (first electrode, second electrode) and the light emitting layer. Next to the electrode.
- Such a conductive polymer in order to reduce the leakage current between the preferred instrument emitting pixels that 10-7 is a S / cm or more and is 10 3 S / cm or less, 10 - it is particularly preferred 3 ⁇ 4 / possible cm or more at and and equal to or less than 10 2 S / cm is at more preferred instrument 10_ 5 S / cm or more and is less lC ⁇ S / cm.
- such a conductive polymer is doped with an appropriate amount of ions so that the electric conductivity of such a conductive polymer is 10_ / cm or more and 10 3 S / cm or less.
- anion is used for the hole injection layer
- force thione is used for the electron injection layer.
- anions include polystyrene sulfonate ions, alkylbenzene sulfonate ions, camphor sulfonate ions, etc.
- cations include lithium ions, sodium ions, potassium ions, tetraptyl ammonium ions. Etc.
- the material used for the charge injection layer may be appropriately selected in relation to the material of the electrode and the adjacent layer, but polyaniline and its derivatives, polythiophene and its derivatives, polypirine. Rolls and derivatives thereof, polyphenylene vinylene and derivatives thereof, polyphenylene vinylene and derivatives thereof, polyquinoline and derivatives thereof, polyquinoxaline and derivatives thereof, polymers having an aromatic amine structure in the main chain or side chain, etc. Molecule; metal phthalocyanine (copper phthalocyanine and the like); carbon and the like.
- an insulating layer having a thickness of 10 nm or less may be provided adjacent to the first electrode and / or the second electrode.
- an insulating layer material include metal fluorides, metal oxides, organic insulating materials, and the like, and metal fluorides and metal oxides such as alkali metals and alkali earth metals are preferable.
- the electron transporting polymer material contained in the organic layer near the second electrode is not particularly limited as long as it is a polymer material in which electrons are injected and transported from the electrode. And ⁇ conjugated polymer and the force of using a polymer material containing an electron transporting group in the polymer as appropriate.
- a low molecular electron transporting material can be used in combination.
- these hole transporting materials and electron transporting materials in addition to charge transport, those having a light emitting mechanism can also be used suitably.
- these layers are doped with the light emitting material. It can also be used.
- the thickness of the layer containing the material of the organic layer as described above has an optimum value depending on the material to be used, but can be appropriately selected so that the driving voltage and the light emission efficiency become appropriate values.
- the thickness of the light emitting layer is, for example, 5 to 300 nm, preferably 30 to 200 nm, more preferably 40 to 150 nm.
- the thickness of the charge injection layer is, for example, 1 nm to 100 ⁇ m, preferably 2 nm to Onm.
- the thickness of the electron transporting layer is, for example, 1 nm to l in, preferably 2 nm to 500 nm, more preferably 5 nm to 200 nm.
- a method of forming a layer containing a polymer material (light emitting layer, charge transport layer, charge injection layer) among the materials of the organic layer described so far for example, coating from a solution is possible.
- a method of forming a film by a printing method or a printing method Such a method can also be employed as a method of forming a layer (light emitting layer, charge transport layer, charge injection layer) that does not contain the polymer material.
- the solution is applied and then dried. The same technique can be applied by simply removing the solvent and mixing the charge transport material and the light emitting material, which is very advantageous in production.
- coating and printing methods include spin coating, casting, micro gravure coating, gravure coating, bar coating, roll coating, wire bar coating, dip coating, spray coating, and screen.
- coating methods such as a printing method, a flexographic printing method, an offset printing method, a chiral coating method, a nozzle coating method, and an inkjet printing method.
- the charge injection material can be formed into a film in the same manner as a solution by dispersing it in water or alcohol in the form of emulsion.
- the solvent used for the material of the organic layer is not particularly limited, but a solvent capable of dissolving or uniformly dispersing the polymer material is preferable.
- a solvent capable of dissolving or uniformly dispersing the polymer material is preferable.
- examples of such a solvent include chlorine solvents such as chloroform, methylene chloride, and dichloroethane; ether solvents such as tetrahydrofuran and the like; toluene , Xylene, tetralin, anisole, n-hexylbenzene, cyclohexylbenzene and other aromatic hydrocarbon solvents; decalin, bicyclohexyl and other aliphatic hydrocarbon solvents; acetone, methyl ethyl ketone, 2- Examples include ketone solvents such as heptanone; ester solvents such as ethyl acetate, butyl acetate, ethyl cellosolve a
- insolubilize the first formed layer in order to prevent mixing of the upper and lower layers.
- a method for insolubilization in this way, a soluble precursor or a polymer having a soluble group is used, and the precursor is converted into a synergistic polymer by heat treatment or dissolved by decomposing the soluble group.
- a method of insolubilizing by lowering the property, a method of using a hole transporting polymer having a crosslinking group in the molecule, a method of mixing a monomer or a macromer that causes a crosslinking reaction by heat, light, electron beam, etc. are listed.
- Examples of such a cross-linking group include polymers having a bur group, a (meth) acrylate group, an oxetane group, a cyclobutadiene group, a gen group and the like in the side chain.
- the introduction rate of these groups is
- the monomer or macromer that causes a crosslinking reaction is a compound having a weight average molecular weight of 2000 or less in terms of polystyrene, such as a bur group, a (meth) acrylate group, an oxetane group, a cyclobutadiene group, and a gen group. Those having two or more groups are exemplified. Furthermore, compounds that can undergo a cross-linking reaction between molecules such as acid anhydride groups and cinnamic acid are also exemplified. As examples of these, those described in “Current Status and Prospects of UV'EB Curing Technology” (supervised by Kunihiro Kashimura, CMC Publishing 2002, 1st edition, 1st edition, 2nd chapter) are preferably used. it can.
- the monomer before polymerization is distilled, sublimated and purified
- Polymerization is preferably performed after purification by a column chromatography method such as recrystallization.
- acid washing, alkali washing, neutralization, water washing, organic solvent washing, reprecipitation, centrifugation, extraction, column chromatography, dialysis, and other conventional separation operations, purification operations, drying, and other operations It is preferable to carry out a purification treatment by the above.
- the organic electoluminescence device of the present invention can be usually produced by forming the above-described first electrode, second electrode, auxiliary electrode, and organic layer on a support substrate.
- a supporting substrate a substrate made of glass, plastic, polymer film, silicon or the like may be used as long as it does not change when the organic electroluminescence device is produced.
- the element structure of the organic electoluminescence element of the present invention is not particularly limited, and may be a top emission type or a bottom emission type. Further, the order in which the first electrode and the like are formed on the support substrate can be appropriately selected according to such an element structure.
- a protective layer may be provided as necessary.
- the material for such a protective layer include glass, plastic, polymer film, silicon, and photocurable resins such as acrylic resins. These protective layer materials can be used alone or in combination of two or more. When light from the organic layer is extracted from such a protective layer side, the protective layer material is used. It is preferable to use a transparent material.
- the organic-electric-luminescence device of the present invention as described above is a curved or flat surface light source for a backlight or illumination of a liquid crystal display; a segment display device used for interiors or advertisements, dots It can be suitably used as a light emitting element used in a matrix display device, a liquid crystal display device or the like, and can be particularly suitably used as a curved or flat surface light source for illumination.
- the obtained reaction solution was cooled, and then a mixed solution of 25% by mass ammonia water 200m 1 / methanol 900ml / ion-exchanged water 900ml was poured into the solution and stirred for about 1 hour. Thereafter, the produced precipitate was collected by filtration, and this precipitate was dried under reduced pressure and then dissolved in toluene.
- the obtained toluene solution was filtered to remove insoluble matters, and the toluene solution was purified by passing through a column filled with alumina.
- the purified toluene solution was washed with a 1N aqueous hydrochloric acid solution, allowed to stand and liquid-separated, and then the toluene solution was recovered. Then, this toluene solution was washed with about 3% by mass ammonia water, allowed to stand and liquid-separated, and then the toluene solution was recovered. Thereafter, this toluene solution was washed with ion-exchanged water, allowed to stand and separated, and the washed toluene solution was recovered.
- the washed toluene solution was poured into methanol to form a precipitate.
- the precipitate was washed with methanol and then dried under reduced pressure to obtain polymer compound 2.
- the obtained polymer compound 2 had a polystyrene equivalent weight average molecular weight of 8.2 ⁇ 10 5 and a polystyrene equivalent number average molecular weight of 1.0 ⁇ 10 5 .
- a photomask for forming the auxiliary electrode was produced as follows. That is, first, extract multiple unit arrays from the Fibonacci layout IJ (nearest interstitial distance: ⁇ ⁇ ) such that the average interstitial distance is 14! 11 and the order in the Fibonacci sequence is 500 to 800. did. Next, grid points were defined from an array that was laid out so that these unit arrays did not overlap each other, and Polonoi partitioning was performed using such grid points as mother points.
- a glass substrate (200 mm ⁇ 200 mm) was used as the support substrate, Cr was deposited on the support substrate by Cr sputtering at 120 ° C. using Cr target and Ar as the sputtering gas.
- the film forming pressure at this time was 0.5 Pa, and the sputtering power was 2. OkW.
- beta for 90 seconds at 110 ° C then manufacturing Through the resulting photomask example, exposed at an energy of 200 mJ, after development with water oxidation of an aqueous solution of potassium 0.5 mass 0/0, and post beta 110 seconds at 130 ° C.
- immerse in Cr etching solution at 40 ° C for 120 seconds perform Cr patterning
- immerse in 2% by weight aqueous potassium hydroxide solution was formed.
- a first electrode was formed on the substrate on which the auxiliary electrode was formed.
- ITO having a film thickness of 3000 nm was deposited by a DC sputtering method at 120 ° C. using an ITO firing target as the first electrode material and Ar as the sputtering gas.
- the film forming pressure was 0.25 Pa
- the sputtering power was 0.25 kW.
- annealing was performed in an oven at 200 ° C for 40 minutes.
- the substrate on which the first electrode is formed is ultrasonically cleaned using a weak alkaline detergent at 60 ° C, cold water, and hot water at 50 ° C, pulled up from the hot water at 50 ° C and dried, and then UV-treated for 20 minutes. / O cleaning was performed.
- the polymer compound 1 and the polymer compound 2 obtained in Synthesis Examples 1 and 2 were dissolved in toluene to prepare a 1% by mass polymer solution, and the hole injection layer was formed from the prepared solution.
- a light-emitting layer was formed by spin-coating onto a substrate having a thickness of 80 nm and heat-treating on a hot plate in a nitrogen atmosphere at 130 ° C. for 60 minutes. Thereafter, LiF, Ca, and A1 were sequentially deposited to a thickness of 2 nm, 5 nm, and 200 nm by vacuum deposition on the substrate on which the light emitting layer was formed, thereby forming a second electrode. Degree of vacuum metal vapor deposition was initiated after reaching below 1 X 10- 4 Pa.
- the surface of the second electrode on the substrate on which the second electrode is formed is covered with a glass plate in an inert gas, and then the four sides of the substrate are covered with a photocurable resin, and then the photocurable resin is cured.
- a protective layer was formed, and an organic EL light emitting device was produced.
- Fig. 5 shows the organic EL light-emitting device thus obtained. That is, the organic EL device shown in FIG. 5 includes a support substrate 1, an auxiliary electrode 2, a first electrode 3, a charge injection layer 4, a light emitting layer 5, a second electrode. A pole 6 and a protective layer 7 are provided. An organic layer 11 composed of the charge injection layer 4 and the light emitting layer 5 is sandwiched between the first electrode 3 and the second electrode 6. An auxiliary electrode 2 is formed on the surface of the first electrode 3 opposite to the organic layer 11.
- the organic electroluminescent device of the present invention When the voltage of 8 V was applied to the entire organic EL light-emitting device obtained in the example, the appearance of the light-emitting surface was visually observed, and the light-emitting surface had no uneven emission luminance and was colored when reflecting external light. No phenomenon or moire fringes occurred. Therefore, in the organic electroluminescent device of the present invention, the voltage drop due to the resistance of the transparent electrode or the semi-transparent electrode can be reduced, and the light can be emitted uniformly. It was confirmed that occurrence of the fringe pattern can be sufficiently suppressed.
- the present invention it is possible to reduce the voltage drop due to the resistance of the transparent electrode or the translucent electrode, and to emit light uniformly, and to add moire due to coloring or interference when reflecting external light.
- the ability to provide organic-electrical luminescence elements with sufficiently reduced streaking is possible.
- the organic electoluminescence device of the present invention is useful as a light-emitting element used in a planar light source, a segment display device, a dot matrix display device, a liquid crystal display device, and the like.
- FIG. 1 is a plan view showing a Fibonacci arrangement.
- FIG. 2 is a schematic plan view showing one embodiment of a unit array extracted from a Fibonacci array.
- FIG. 3 is a schematic plan view showing another embodiment of the unit array extracted from the Fibonacci array.
- FIG. 4 is a schematic plan view showing another embodiment of the unit array extracted from the Fibonacci array.
- FIG. 5 is a schematic cross-sectional view showing the laminated structure of the organic electoluminescence device obtained in the example. Explanation of symbols
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EP07806269.2A EP2059095B1 (en) | 2006-08-30 | 2007-08-29 | Organic electroluminescence element |
US12/438,377 US8324801B2 (en) | 2006-08-30 | 2007-08-29 | Organic electroluminescence element |
CN200780031913.8A CN101513126B (zh) | 2006-08-30 | 2007-08-29 | 有机电致发光器件 |
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- 2007-08-29 CN CN200780031913.8A patent/CN101513126B/zh not_active Expired - Fee Related
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US8994044B2 (en) | 2009-12-11 | 2015-03-31 | Nederlandse Organisatie Voor Toegepast—Natuurwetenschappelijk Onderzoek Tno | Electro-optical device, electrode therefore, and method and apparatus of manufacturing an electrode and the electro-optical device provided therewith |
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Also Published As
Publication number | Publication date |
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JP5076023B2 (ja) | 2012-11-21 |
EP2059095A1 (en) | 2009-05-13 |
CN101513126B (zh) | 2010-11-10 |
CN101513126A (zh) | 2009-08-19 |
JP2012084535A (ja) | 2012-04-26 |
EP2059095B1 (en) | 2017-02-01 |
US20100244666A1 (en) | 2010-09-30 |
TW200818981A (en) | 2008-04-16 |
US8324801B2 (en) | 2012-12-04 |
EP2059095A4 (en) | 2014-05-14 |
KR20090048610A (ko) | 2009-05-14 |
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