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WO2011117791A1 - Dispositif d'éclairage à base de diodes électroluminescentes comprenant une pluralité de substances luminescentes - Google Patents

Dispositif d'éclairage à base de diodes électroluminescentes comprenant une pluralité de substances luminescentes Download PDF

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Publication number
WO2011117791A1
WO2011117791A1 PCT/IB2011/051143 IB2011051143W WO2011117791A1 WO 2011117791 A1 WO2011117791 A1 WO 2011117791A1 IB 2011051143 W IB2011051143 W IB 2011051143W WO 2011117791 A1 WO2011117791 A1 WO 2011117791A1
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Prior art keywords
luminescent materials
led
lighting device
group
luminescent
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PCT/IB2011/051143
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English (en)
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Robert Peter Scholl
Thomas Juestel
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Koninklijke Philips Electronics N.V.
Philips Intellectual Property & Standards Gmbh
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Publication of WO2011117791A1 publication Critical patent/WO2011117791A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
    • C09K11/7706—Aluminates
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/06—Radiation therapy using light
    • A61N5/0613—Apparatus adapted for a specific treatment
    • A61N5/0618—Psychological treatment
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
    • C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
    • C09K11/7767—Chalcogenides
    • C09K11/7769—Oxides
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
    • C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
    • C09K11/7774—Aluminates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
    • C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
    • C09K11/7776—Vanadates; Chromates; Molybdates; Tungstates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
    • C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
    • C09K11/7777—Phosphates
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/06—Radiation therapy using light
    • A61N2005/065—Light sources therefor
    • A61N2005/0651—Diodes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/06—Radiation therapy using light
    • A61N2005/0658—Radiation therapy using light characterised by the wavelength of light used
    • A61N2005/0662—Visible light
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/851—Wavelength conversion means
    • H10H20/8511—Wavelength conversion means characterised by their material, e.g. binder
    • H10H20/8512—Wavelength conversion materials

Definitions

  • LED-based lighting device comprising a plurality of luminescent materials
  • the invention relates to a LED-based lighting device comprising a plurality of luminescent materials, to a composition comprising such plurality of luminescent materials, for instance for use in such LED-based lighting device, as well as to the use of such LED- based lighting device.
  • WO0211214 for instance describes a luminescence conversion LED based illumination device that emits primarily radiation in the range of 370-430 nm of the optical spectrum (peak wavelength). Said radiation is converted to radiation having a longer wavelength using three luminescent substances that emit in the red, green and blue range.
  • US2005029929 proposes an arrangement of luminescent materials for excitation by means of a radiation source and involving the use of a luminescent material having a Ce-activated garnet structure A3B5O12, in which the first component A contains at least one element from the group consisting of Y, Lu, Sc, La, Gd, Sm and Tb and the second component B represents at least one of the elements Al, Ga and In, and a plurality of the luminescent materials are mixed together.
  • WO0211173 describes a device for the generation of specific colored light including white light by luminescent down conversion and additive color mixing based on a light-emitting diode comprising a semiconductor light-emitting layer emitting near UV light about 370-420 nm or blue light about 420-480 nm and phosphors which absorb completely or partly the light emitted by the light-emitting component and emit light of wavelengths longer than that of the absorbed primary light, wherein the light emitting layer of the light emitting component is preferably a Ga(In)N-based semiconductor; and at least one of the phosphors contains a metal sulfide fluorescent material activated with europium containing at least one element selected from the group consisting of Ba, Sr, Ca, Mg and Zn; and/or at least another phosphor which contains a complex thiometalate fluorescent material activated with either europium, cerium or both europium and cerium containing at least one element selected from the group consisting of Ba, Sr, Ca
  • Phosphor converted LEDs (pcLEDs) devices are now widely applied for general and special lighting purposes, and they are regarded as a breakthrough technology for the lighting business. Therefore, tremendous research activities at industrial and university labs to develop phosphors to achieve pcLED devices with a high luminous efficacy and color rendering exist all, over the world.
  • the present invention proposes a LED-based lighting device that comprises luminescent materials (i.e. pcLED) that converts at least part of the LED light, and which device (in use) emits a full spectrum, including the near infrared (NIR) range.
  • luminescent materials i.e. pcLED
  • NIR near infrared
  • this can be achieved by using a (blue-emitting) LED and a blend of luminescent materials, which may comprise two or more luminescent materials, and even up to seven different luminescent materials, or if desired even more.
  • Such LED-based lighting device may especially be used for indoor lighting, for medical treatment of mental diseases, and for mood lighting.
  • the device may be used for the treatment of seasonal affected disorder (SAD) or other mental diseases caused by the lack in exposure to natural daylight.
  • SAD seasonal affected disorder
  • the proposed device may provide better results in the treatment of mental diseases or in mood lighting than conventional tri-band based devices or other solutions known in the art.
  • the device of the invention may supply an emission spectrum that mimics the spectral power distribution of solar light including the NIR range.
  • the light of the device may mimic the spectral power distribution of solar radiation (at sea level) between 400 and 1200 nm.
  • a main advantage of solid state light sources according to the present invention over full spectrum light sources based on fluorescent lamps, Hg low-pressure lamps, may be the improved spectrum, which may mimic much better the daylight spectrum.
  • solid state light sources may be much less sensitive towards temperature variation, fast switching cycles, and mechanical shocks.
  • the invention provides a LED-based lighting device comprising a plurality of luminescent materials, wherein the luminescent materials are excitable by light from the LED, and wherein the LED and the luminescent materials are arranged to emit light (during use of the device) in the wavelength ranges 440-490 nm, 500-580 nm, 590-680 nm, 690-850 nm, 850-950 nm and 1000-1200 nm.
  • Such device may especially mimic daylight and may have an appreciated or even beneficial effect on humans and/or animals.
  • the invention relates to a composition comprising a plurality of luminescent materials as defined herein.
  • the composition may be a powder composition, a ceramic material (body), a glass body comprising the composition, a paste comprising the composition, etc.
  • Such composition may especially be applied in the LED- based lighting device of the invention.
  • the lighting device of the invention may especially be used for medical treatment of mental diseases.
  • the composition as defined above may especially be used in a process for the production of the herein described LED-based lighting device.
  • Fig. 1 shows an example of global radiation (air mass 1.5) (1) and typical spectral components of the claimed solid state light source (2: LED light; C1-C7:
  • Fig. 2 shows a spectrum (3) of a halogen lamp and of a warm-white pcLED comprising a blue emitting chip and a dichromatic phosphor blend comprising YAG:Ce and CaS:Eu (4) (but yet without > 850 nm components);
  • Fig. 3 shows an emission (5) , excitation (6), and reflection (7) spectrum of an
  • NIR emitting SrB 4 0v:Sm 2+ phosphor which can be pumped by blue light, and which can be used in the luminescent material composition and in the LED-based lighting device of the invention
  • Fig. 4 shows an emission (8), excitation (9), and reflection (10) spectrum of an NIR emitting GdP0 4 :Nd 3+ phosphor, which can be pumped by visible light.
  • This luminescent material can be used in the luminescent material composition and in the LED-based lighting device of the invention;
  • Figs. 5-6 show examples of a full spectrum LED light source comprising a blue emitting LED and a luminescent screen comprising a 6 component phosphor blend (composition), wherein:
  • Fig. 5 shows a spectrum (3) of a halogen lamp and a spectrum (11) of a full spectrum pcLED comprising a blue emitting chip and a hexachromatic phosphor blend comprising Sr 4 Ali 4 0 2 5:Eu, Lu 3 Al 5 0i 2 :Ce, (Sr,Ca) 2 Si0 4 :Eu, CaAlSiN 3 :Eu, SrB 4 0 7 :Sm and GdP0 4 :Ce;Nd; and
  • Fig. 6 shows a spectrum (3) of a halogen lamp and a spectrum (11) of a full spectrum pcLED comprising a blue emitting chip and a hexachromatic phosphor blend comprising Sr 4 Ali 4 0 25 :Eu, Lu 3 Al 5 0i 2 :Ce, (Sr,Ca) 2 Si0 4 :Eu, CaAlSiN 3 :Eu, SrB 4 0 7 :Sm, and
  • Figs 7a- 7b show a LED-based lighting device.
  • the term "LED-based lighting device” indicates a lighting device wherein part of the light generated by the device in use is generated by and/or induced by the LED.
  • the LED may provide blue light, of which part may be absorbed by the luminescent materials, which on their turn convert at least part of the absorbed blue light into light at longer wavelengths, such as green, orange, red, etc.
  • the LED may alternatively and/or additionally also provide UV light, of which part may be absorbed by the luminescent materials, which on their turn convert at least part of the absorbed blue light into light at longer wavelengths, such as blue, green, orange, red, etc.
  • the choice of the LED and the luminescent materials is such, that in use of the device, light is generated in the above- mentioned wavelength ranges.
  • the term "plurality of luminescent materials” refers to two or more luminescent materials.
  • the luminescent materials herein are especially inorganic luminescent materials, such as aluminates, nitrides, oxides, oxynitrides, sulfides, thiogallates, tantalates, tungstates, borates, etc.
  • the LED is arranged to emit light in the wavelength range 440-490 nm. In a further embodiment, part of this light may be converted by the luminescent materials into light in the other herein indicated wavelength ranges.
  • the LED is only arranged to emit in the UV or in the blue.
  • the plurality of LEDs may emit in the UV, in the blue, or both in the UV and the blue.
  • the term "LED” may also refer to a plurality of LED's.
  • one or more UV LEDs and one or more blue LEDs may be applied. In any case, part of the light of one or more of the LEDs is converted (when the device is in use) by the luminescent materials.
  • one or more luminescent materials are arranged to emit in the 850-950 nm range, wherein the(se) one or more luminescent materials are preferably selected from the group consisting of Yb 3+ -based luminescent materials.
  • Yb 3+ based luminescent materials may be able to emit efficiently in this wavelength range.
  • the term Yb 3+ based luminescent material and similar terms indicate that as luminescent species such ion is present in the matrix of the luminescent material (or more precisely host material or host lattice). This is well-known in the art, see for instance
  • Luminescent Materials by G. Blasse and B. C. Grabmaier, Springer- Verlag Telos (September 1994), ISBN-10: 0387580190.
  • Luminescent ions are often also indicated as activators. In general, those ions are introduced in the starting materials of the luminescent material to be made and replace part of the host material.
  • Y3AI5O12 may be doped with Yb 3+ or Nd 3+ by replacing part of the Y-based starting material by Yb-based or Nd-based starting material, respectively. This is known in the art, see for instance the above indicated book.
  • the one or more luminescent materials are preferably selected from the group consisting of M 3 B 5 0i 2 :Yb 3+ ; MA10 3 :Yb 3+ ; ZX0 3 :Yb 3+ ,Na; M 2 0 3 :Yb 3+ ; M 2 Z 2 0 7 :Yb 3+ ;
  • M comprises one or more metals selected from the group consisting of Y, Gd and Lu
  • B comprises one or more metals selected from the group consisting of Al and Ga
  • T comprises one or more metals selected from the group consisting of Ti
  • Z comprises one or more metals selected from the group consisting of Ca, Sr and Ba
  • Q comprises one or more elements selected from the group consisting of Ta, P and V (see also table 1).
  • one or more luminescent materials are arranged to emit in the 1000-1200 nm range, wherein the(se) one or more luminescent materials are preferably selected from the group consisting of RE 3+ -based luminescent materials, wherein RE is selected from the group consisting of Nd and the combination of Ce and Nd. Especially the latter (the combination of Ce and Nd) is preferred, since Nd can be pumped by (via) Ce. Especially RE 3+ based luminescent materials may be able to emit efficiently in this range of 1000-1200 nm.
  • the one or more luminescent materials are preferably selected from the group consisting of M 3 B 5 0i 2 :RE 3+ ; MA10 3 :RE 3+ ; ZX0 3 :RE 3+ ,Na; M 2 0 3 :RE 3+ ; M 2 Z 2 0 7 :RE 3+ ; MMgAldonOi 9 :RE 3+ ; ZAli 2 0i 9 :RE 3+ ,Na; ZAl 2 0 4 :RE 3+ ,Na; and MQ0 4 :RE 3+ ; wherein M comprises one or more metals selected from the group consisting of Y, Gd and Lu, B comprises one or more metals selected from the group consisting of Al and Ga, T comprises one or more metals selected from the group consisting of Ti, Zr and Hf, Z comprises one or more metals selected from the group consisting of Ca, Sr and Ba, Q comprises one or more elements selected from the group consisting of Ta, P and V, and RE comprises
  • x, y, z, a, and b are indices indicating the molar amount in the respective compounds.
  • x, y, z, a, and b comply with the general formula as indicated in the column "phosphor type". For instance, for the first entry, (Lui_ x _ y _ z Gd x Y y )3Al 5 0i 2 :Yb z x, y, and z are in the range of 0-1, with z>0.
  • ZX0 3 :Yb 3+ ,Na, x and y are in the range of 0-1, and z is in the range of 0- 0.5, with z>0, and a, b are in the range of 0-1.
  • z>0 and z is preferably ⁇ 0.1, even more preferably z ⁇ 0.05.
  • the activator content i.e. z
  • the molar ratio of Ce:Nd in Ce-Nd co-doped systems is preferably in the range of about 1 : 10 to 1 :1.
  • the luminescent ion replacing a lattice ion having a lower charge for instance part of the Sr 2+ in the system being replaced by Yb 3+ and Na + .
  • this may apply to systems wherein the activator replacing a lattice ion having a higher charge.
  • NIR emission in the 850-1200 nm wavelength range is Pr , Sm , Er , or Tm . While for the conversion of the blue/violet radiation into the visible range (blue/cyan to red), Eu 2+ activated luminescent materials may especially be applied, the conversion into the NIR spectral range may especially be done by Cr 3+ , Nd 3+ , Tm 3+ , and/or Yb 3+ activated luminescent materials.
  • Nd-based systems may further comprise Ce (see also above).
  • this may also refer to Nd,Ce-based systems.
  • M 3 B 5 0i 2 :Nd 3+ instead of M 3 B 5 0i 2 :Nd 3+ also M 3 B 5 0i 2 :Nd 3+ ,Ce 3+ may be applied.
  • the Nd 3+ -based luminescent material may be co-doped with Ce 3+ .
  • Ce 3+ -based luminescent materials may be co-doped with Pr 3+ .
  • Ce 3+ -based luminescent materials are not co-doped with Pr 3+ .
  • Eu 2+ -based systems may further comprise Sm 2+ .
  • this may also refer to Eu,Sm- based systems.
  • Sr 2 Si 5 N8 :Eu 2+ instead of Sr 2 Si 5 N 8 :Eu 2+ also Sr 2 Si 5 N 8 :Eu 2+ ,Sm 2+ may be applied.
  • the Eu 2+ -based luminescent material may be co-doped with Sm 2+ .
  • Eu 2+ -based systems are not co-doped with Sm 2+ .
  • more than one luminescent material may emit in the same wavelength range.
  • luminescent material may be selected from, amongst others, luminescent materials indicated in tables 2-4.
  • Tab. 2 Examples of luminescent materials applied as converters in full spectrum pcLED lamps (Eu 2+ , Ce 3+ and Mn 4+ based luminescent materials).
  • Tab. 4 Examples of Sm 2+ activated phosphors for the conversion of blue radiation into the NIR (Sm 2+ based luminescent materials).
  • At least two luminescent materials are selected from table 2.
  • At least one luminescent material is selected from tables 1 and 3-4.
  • At least one, more preferably two, luminescent materials are selected from table 1, especially one or more Yb-based and one or more Nd-based luminescent materials.
  • a preferred composition of luminescent materials for use in the device comprises Sr 4 Ali 4 0 2 5:Eu, Lu 3 Al 5 0i 2 :Ce, (Sr,Ca) 2 Si0 4 :Eu, CaAlSiN3:Eu, SrB 0 7 :Sm and Y3Al 5 0i 2 :Ce,Nd.
  • Another preferred composition comprises Sr Ali 0 2 5:Eu, Lu3Al 5 0i 2 :Ce, (Sr,Ca) 2 Si0 4 :Eu, CaAlSiN 3 :Eu, SrB 4 0 7 :Sm, and Y 3 Al 5 0i 2 :Ce,Nd.
  • one or more luminescent materials are quantum dot luminescent materials.
  • the emission maximum per wavelength region has an intensity in W (Watt) having a deviation of 20% or less from the intensity in W of the day light spectrum at the same wavelength.
  • W intensity in W
  • the emission spectrum of the device is compared with the sunlight (solar light) measured during daytime at sea level.
  • the spectra are normalized to each other.
  • the maximum in the indicated wavelength range of the emission spectrum of the device be it a peak or a part of a band, is compared with the spectrum of the daylight.
  • the difference (higher or lower) from the daylight spectrum is preferably less than about 20%, in each of the indicated wavelength ranges.
  • Spectra with power (Watt) as function of the wavelength (nm) are compared.
  • the differences are smaller than about 10%.
  • the luminescent materials may for instance be provided as a powder layer comprising quantum dots, or ⁇ - or nanoscale particles.
  • the luminescent materials may in an embodiment be dispersed in a polymer or coated onto the LED.
  • the luminescent materials may be comprised in one or more ceramic bodies and/or glass bodies.
  • the LED is arranged remote from (at least part of) the luminescent materials.
  • the luminescent materials may be coated to a housing and/or coated to or implemented in a transmissive ceramic material (as window), preferably remote from the LED(s).
  • at least part of one or more luminescent materials may be integrated in or coated to or both integrated in or coated to a transmissive body, especially a transmissive ceramic material.
  • the luminescent materials may also be arranged in a coating on the LED.
  • the phrase "at least part of one or more luminescent materials” may indicate part of the total number of luminescent materials but may also indicate part of the total amount of luminescent materials.
  • Figure 1 shows an example of global radiation (air mass 1.5), indicated with reference 1 and typical spectral components of the claimed solid state light source, indicated with reference 2.
  • the spectral components consist here of the LED emission and 7 components, indicated with references C1-C7. These components are examples of the herein mentioned luminescent materials (see tables 1-4).
  • Figure 1 shows by way of example that with the spectral components, the global radiation can be matched, and by choosing the right ratios, the maxima in the herein indicated spectral regions may be adjusted to follow the course of the global radiation curve 1. For specific embodiments, see also below.
  • Figure 2 shows a spectrum of a halogen lamp, indicated with reference 3.
  • This figures further shows a curve, indicated with reference 4, of an emission spectrum of a warm- white pcLED comprising a blue emitting chip and a dichromatic phosphor blend comprising YAG:Ce and CaS:Eu.
  • This figure is used to show the emission of those two possible luminescent material composition materials.
  • further luminescent materials may be added (see also below).
  • Figure 3 shows an emission spectrum 5, an excitation spectrum 6, and a reflection spectrum 7 of an NIR emitting SrB 4 0 7 :Sm 2+ phosphor.
  • this luminescent material can be pumped by blue light.
  • this luminescent material is an example of a phosphor that can be used in the composition when for instance using a blue LED in the LED-based device.
  • this phosphor can also be used in an UV-LED based device.
  • Figure 4 shows an emission spectrum 8, an excitation spectrum 9, and a reflection spectrum 10 of an NIR emitting GdP0 4 :Nd 3+ phosphor, which can be pumped by visible light.
  • This luminescent material can be used in the luminescent material composition and in the LED-based lighting device of the invention. This luminescent material may also be used to absorb emission of blue or green emitting luminescent materials, and down convert it to NIR emission. Optionally, the luminescent material may also be co-doped with Ce 3+ . This may enhance absorption in the UV/blue.
  • Figures 5-6 show examples of a full spectrum LED light source comprising a blue emitting LED and a luminescent screen comprising a 6 component phosphor blend (composition).
  • Figure 5 shows an emission spectrum 3 of a halogen lamp and an emission spectrum 11 of a full spectrum pcLED comprising a blue emitting chip and a hexachromatic phosphor blend comprising Sr 4 Ali 4 0 25 :Eu, Lu 3 Al 5 0i 2 :Ce, (Sr,Ca) 2 Si0 4 :Eu, CaAlSiN 3 :Eu, SrB 4 0 7 :Sm and GdP0 4 :Ce;Nd.
  • the emission 11 of the device follows the emission spectrum 3 of the halogen lamp.
  • more components can be added to the luminescent material composition and/or ratios' can be varied.
  • Figure 6 shows a spectrum 3 of a halogen lamp and an emission spectrum 11 of a full spectrum pcLED comprising a blue emitting chip and a hexachromatic phosphor blend comprising Sr 4 Ali 4 0 25 :Eu, Lu 3 Al 5 0i 2 :Ce, (Sr,Ca) 2 Si0 4 :Eu, CaAlSiN 3 :Eu, SrB 4 0 7 :Sm, and Y 3 Al 5 0i 2 :Ce,Nd.
  • the emission 11 of the device follows the emission spectrum 3 of the halogen lamp.
  • more components can be added to the luminescent material composition and/or ratios' can be varied.
  • Figures 7a- 7b schematically depict two embodiments, wherein reference 100 indicates the LED-based device, which comprises a LED 1 10. Luminescent material is indicated with reference 120 and radiation (emission) of the LED-based device (from luminescent material 120 and optionally the LED 1 10) is indicated with reference 130.
  • the luminescent material 120 is arranged on the LED, for instance as a coating or embedded in a resin.
  • Figure 7b schematically depicts an embodiment wherein the luminescent material 120 is arranged remote from the LED 1 10.
  • the luminescent material 120 is comprised by a device window 121.
  • Such window may be a glass or other transparent material, such as polyethylene PE or polymethyl methacrylate PMMA, wherein the luminescent material 120 is embedded or whereto the luminescent material 120 is coated.
  • the window may also comprise a luminescent ceramic material. Emission from the LED in this embodiment is indicated with reference 131.
  • One or more of the luminescent materials may at least partially absorb this light and convert it into light in one or more of the herein indicated wavelength ranges.
  • substantially may also include embodiments with “entirely”, “completely”, “all”, etc. Hence, in embodiments the adjective substantially may also be removed. Where applicable, the term “substantially” may also relate to 90% or higher, such as 95% or higher, especially 99% or higher, even more especially 99.5% or higher, including 100%.
  • the term “comprise” includes also embodiments wherein the term “comprises” means “consists of.

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  • Luminescent Compositions (AREA)

Abstract

La présente invention a trait à un dispositif d'éclairage à base de diodes électroluminescentes comprenant une pluralité de substances luminescentes, lesquelles substances luminescentes sont excitables par la lumière provenant d'une diode électroluminescente, la diode électroluminescente ainsi que les substances luminescentes étant agencées de manière à émettre de la lumière dans les domaines de longueurs d'onde allant de 440 à 490 nm, de 500 à 580 nm, de 590 à 680 nm, de 690 à 850 nm, de 850 à 950 nm et de 1 000 à 1 200 nm. Ledit dispositif d'éclairage à base de diodes électroluminescentes peut être utilisé pour l'éclairage intérieur, pour un traitement médical de maladies mentales et pour la luminothérapie.
PCT/IB2011/051143 2010-03-24 2011-03-18 Dispositif d'éclairage à base de diodes électroluminescentes comprenant une pluralité de substances luminescentes WO2011117791A1 (fr)

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US9541243B2 (en) 2012-04-13 2017-01-10 Koninklijke Philips N.V. Light conversion assembly, a lamp and a luminaire
US9404627B2 (en) 2012-04-13 2016-08-02 Koninklijke Philips N.V. Light conversion assembly, a lamp and a luminaire
AU2013360074B2 (en) * 2012-12-11 2016-08-11 Elc Management Llc Cosmetic compositions with near infrared (NIR) light - emitting material and methods therefor
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DE102013106573B4 (de) 2013-06-24 2021-12-09 OSRAM Opto Semiconductors Gesellschaft mit beschränkter Haftung Strahlungsemittierendes optoelektronisches Bauelement, Gassensor mit strahlungsemittierenden optoelektronischen Bauelement und Verfahren zur Herstellung eines strahlungsemittierenden optoelektronischen Bauelements
EP3623447A1 (fr) * 2018-09-14 2020-03-18 Seaborough IP I B.V. Composition luminescente
WO2020053427A1 (fr) * 2018-09-14 2020-03-19 Seaborough Ip I B.V. Composition luminescente
CN112771136A (zh) * 2018-09-14 2021-05-07 西博勒Ip I 私人有限公司 发光组合物
JP2022500531A (ja) * 2018-09-14 2022-01-04 シーボロー・アイピー・アイ.・ビー.ブイ.Seaborough Ip I. B.V. 発光組成物
US12286576B2 (en) 2018-09-14 2025-04-29 Seaborough Materials Ip B.V. Luminescent composition
WO2020186002A1 (fr) * 2019-03-13 2020-09-17 Current Lighting Solutions, Llc Dispositifs d'éclairage d'horticulture
US11477945B2 (en) 2019-03-13 2022-10-25 Current Lighting Solutions, Llc Horticulture lighting device

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