WO2005097939A1 - 蛍光変換媒体及びカラー発光装置 - Google Patents
蛍光変換媒体及びカラー発光装置 Download PDFInfo
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- WO2005097939A1 WO2005097939A1 PCT/JP2005/004225 JP2005004225W WO2005097939A1 WO 2005097939 A1 WO2005097939 A1 WO 2005097939A1 JP 2005004225 W JP2005004225 W JP 2005004225W WO 2005097939 A1 WO2005097939 A1 WO 2005097939A1
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- H05B33/00—Electroluminescent light sources
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- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/70—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing phosphorus
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/88—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing selenium, tellurium or unspecified chalcogen elements
- C09K11/881—Chalcogenides
- C09K11/883—Chalcogenides with zinc or cadmium
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- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
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- H10K71/10—Deposition of organic active material
- H10K71/16—Deposition of organic active material using physical vapour deposition [PVD], e.g. vacuum deposition or sputtering
- H10K71/164—Deposition of organic active material using physical vapour deposition [PVD], e.g. vacuum deposition or sputtering using vacuum deposition
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- H10K85/60—Organic compounds having low molecular weight
- H10K85/631—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
Definitions
- the present invention relates to a fluorescence conversion medium and a color light emitting device using the fluorescence conversion medium.
- the present invention relates to a high-efficiency fluorescence conversion medium in which semiconductor nanocrystals are dispersed, and a color light emitting device in which the fluorescence conversion medium is combined with a light source that emits visible light.
- Fluorescence conversion media that use a fluorescent material to convert the wavelength of light emitted from a light source have been applied in various fields including the field of electronic displays.
- an organic electroluminescent material portion that emits blue light or blue-green light (hereinafter, the electroluminescent material may be referred to as EL) and at least one color from blue green to red that absorbs light emitted from the light emitting layer.
- An electorescence luminescent element in which a fluorescent material that emits visible light fluorescence is disposed is disclosed (for example, see Patent Document 1). According to this method, a blue light source is used, and a fluorescent conversion medium is used. The three primary colors are obtained by color conversion. That is, in the fluorescence conversion medium, the fluorescent dye is excited by irradiating blue light to generate green light and red light having longer wavelengths.
- an organic fluorescent dye and an organic fluorescent pigment have conventionally been generally used.
- a red fluorescent pigment composed of a rhodamine-based fluorescent pigment and a fluorescent pigment that absorbs in the blue region and induces energy transfer or re-absorption to the rhodamine-based fluorescent pigment is dispersed in a light-transmitting medium.
- a conversion medium has been disclosed (for example, see Patent Document 2).
- the light emitted from the light source needs to be sufficiently absorbed by the fluorescence conversion medium.
- concentration of the organic fluorescent dye in the fluorescence conversion medium is increased, the organic fluorescent dyes associate with each other in the film, and the absorbed energy escapes to the adjacent dye associated with the light source. A phenomenon called concentration quenching is inevitable, and a high fluorescence quantum yield is obtained The power I could't do.
- Patent Document 5 discloses a technique for producing a full-color organic EL device using semiconductor nanocrystals.
- Technology has been proposed.
- Patent Document 6 discloses a technology for realizing a high-efficiency white LED by combining an LED with a fluorescence conversion medium in which semiconductor nanocrystals are dispersed.
- Patent Document 5 a film in which CdS, CdSe, and CdTe are dispersed as light-transmitting resin as semiconductor nanocrystals is used as a fluorescence conversion medium, and is combined with an organic EL device that emits blue monochromatic light having a peak wavelength of 450 nm. Thus, red light emission and green light emission are obtained. Conversion colors such as red and green are controlled by controlling the particle size of the semiconductor nanocrystal.
- Patent Document 5 The present inventor paid attention to the technology of Patent Document 5, and examined a combination of a fluorescence conversion medium using semiconductor nanocrystals and an organic EL device.
- Patent Document 1 JP-A-3-152897
- Patent Document 2 JP-A-8-286033
- Patent Document 3 JP-A-2000-256565
- Patent Document 4 JP 2003-231450 A
- Patent Document 5 U.S. Patent No. 6,608,439
- Patent Document 6 U.S. Patent No. 6,501,091
- the present invention has been made in view of the above-described problems, and by efficiently exhibiting the fluorescence conversion ability of a semiconductor nanocrystal, the fluorescence conversion medium having a high fluorescence conversion efficiency has less deterioration over time. It is an object to provide a fluorescence conversion medium and a color light emitting device using the same.
- the present inventors have pursued the causes of the above phenomena in order to solve the problems.
- the fundamental causes are (1) the magnitude of the refractive index of the semiconductor nanocrystal itself, and (2) the absorption spectrum. Self-absorption due to slight overlap of the fluorescence spectra.
- the refractive index of the transparent resin serving as the dispersion medium of the semiconductor nanocrystal is usually in the range of 1.4.1.6. Therefore, as the concentration of the semiconductor nanocrystals in the fluorescence conversion medium is increased to sufficiently absorb the light emitted from the organic EL element, the refractive index of the fluorescence conversion medium gradually increases.
- the absorption spectrum and the fluorescence spectrum of the semiconductor nanocrystal slightly overlap each other. That is, the semiconductor nanocrystal self-absorbs the fluorescence emitted by itself. Therefore, as the concentration of the nanocrystals in the fluorescence conversion medium increases, this self-absorption cannot be ignored, and the fluorescence conversion efficiency decreases.
- the inventors of the present invention have studied while changing the type, concentration, and the like of the semiconductor nanocrystal, and as a result, have improved the fluorescence conversion efficiency by suppressing the light confinement effect and suppressing the self-absorption of the fluorescence. Found that there is an optimal range for it.
- the following fluorescence conversion medium and color light emitting device are provided.
- Fluorescence that consists of semiconductor nanocrystals and absorbs visible light to emit fluorescence of different wavelengths
- a fluorescent conversion medium comprising fine particles and a transparent medium for dispersing and holding the fluorescent fine particles, wherein the average particle size of the fluorescent fine particles is r (unit: nm), and the thickness of the fluorescent conversion medium is d (unit). Zm), a fluorescence conversion medium that satisfies 0.4 ⁇ Cd / r 3 ⁇ 5.0, where C (unit: vol%) represents a volume ratio of the fluorescent fine particles in the fluorescence conversion medium.
- a fluorescence conversion substrate comprising: a light-transmitting support substrate; and a fluorescence conversion unit provided on the light-transmission support substrate, wherein the fluorescence conversion unit includes the fluorescence conversion medium according to 1.
- a light source unit that emits visible light
- a fluorescence conversion unit that receives light emitted from the light source unit and emits fluorescence with a longer wavelength
- the fluorescence conversion unit is any one of items 14 to 14.
- a color light emitting device including a fluorescence conversion medium.
- the fluorescence conversion section is a laminate of the fluorescence conversion medium and a color filter that transmits light in the wavelength range of the fluorescent component emitted by the fluorescence conversion medium and blocks light components in other wavelength ranges. 7.
- At least a light source unit that emits blue light, and red (R), green (G), and blue (B) sub-pixels
- a color light-emitting device comprising the fluorescence conversion medium according to any one of items 4, wherein the blue (B) pixel comprises a color filter.
- a light source unit that emits at least blue light, and receives light emitted by the light source unit to emit light in at least one color from a green region to a red region, and transmits a part of the blue light emitted by the light source unit.
- a color light-emitting device comprising: the fluorescence conversion medium according to any one of 4.
- the light source unit comprises a first electrode having light reflectivity, a second electrode having light transmittance, 10.
- the fluorescence conversion medium of the present invention can efficiently exhibit the fluorescence conversion ability of the semiconductor nanocrystal, the fluorescence conversion efficiency of the conversion film is high. Furthermore, since no organic fluorescent pigment or organic fluorescent pigment is used, the deterioration of the fluorescence conversion medium with time is small. Therefore, a color light-emitting device using this fluorescence conversion medium has a stable color display function over a long period of time with little change in color development over time.
- FIG. 1 is a schematic diagram showing a cross section of a fluorescence conversion medium of the present invention.
- FIG. 2 is a schematic diagram showing a state in which a semiconductor nanocrystal emits fluorescence.
- FIG. 3 is a diagram showing a relationship between a particle diameter of a semiconductor material and a shift of a fluorescence wavelength.
- Fig. 4 is a diagram illustrating a fluorescent component confined inside the fluorescence conversion medium.
- FIG. 5 is a diagram showing a relative decrease degree of a fluorescent component that is also taken out to the outside due to a change in the refractive index of the fluorescence conversion medium.
- FIG. 6 shows an absorption spectrum and a fluorescence spectrum of a solution in which CdSe nanocrystal fine particles are diluted and dispersed in toluene.
- FIG. 8 is a schematic diagram of a color light emitting device according to a second embodiment of the present invention.
- FIG. 9 is a schematic view of an organic EL device.
- FIG. 10 is a schematic view of a color light emitting device according to a third embodiment of the present invention.
- FIG. 11 is a schematic view of a color light emitting device according to a fourth embodiment of the present invention.
- FIG. 12 is a schematic view of a color light emitting device according to a fifth embodiment of the present invention.
- FIG. 1 is a schematic diagram showing a cross section of a fluorescence conversion medium.
- the fluorescence conversion medium 1 is a film in which phosphor particles 12 are dispersed in a transparent medium 11, absorbs excitation light emitted from a light source (not shown), and isotropically emits light of longer wavelength (fluorescence). It emanates frequently.
- FIG. 2 is a schematic diagram showing a state in which the phosphor fine particles emit isotropic fluorescence.
- the phosphor fine particles indicated by oblique lines emit fluorescence isotropically by absorbing the excitation light.
- the light (fluorescence) converted by the fluorescence conversion medium 1 and the light of the excitation light that has passed through the film without being converted are emitted to the outside of the conversion film 1.
- the phosphor fine particles used in the present invention are composed of a nanocrystal glass in which the crystal of a semiconductor material is ultrafine to the order of nanometers.
- the nanocrystal of the semiconductor material fine particles that absorb visible light and emit fluorescence having a longer wavelength than the absorbed light can be used.
- these semiconductor materials have a band gap of about 0.5-4. OeV at room temperature in Balta (meaning a material that is not finely divided). It has. Fine particles are formed from these materials, and the particle size is reduced by nano-size. Electrons in the body are trapped in the nanocrystal. As a result, the band gap in the nanocrystal increases.
- FIG. 3 shows an example of the relationship between the particle size of the semiconductor material and the emission wavelength.
- FIG. 3 is a diagram showing the relationship between the particle size and the emission wavelength of fine particles that also have cadmium selenide (CdSe) force. This relationship is a result obtained by a theoretical calculation.
- the band gap of the CdSe Balta crystal at room temperature is 1.74 eV, which corresponds to a near infrared fluorescence wavelength of about 750 ⁇ m.
- the fluorescence wavelength gradually shifts to a shorter wavelength than 750 nm.
- the shift amount becomes remarkable below lOnm.
- fluorescence of 630 nm corresponding to pure red and 530 nm of fluorescence at 4 nm correspond to green.
- the band gap can be controlled by controlling the particle size of the semiconductor fine particles.
- These semiconductors absorb light having a wavelength smaller than the wavelength corresponding to the band gap, and emit fluorescence having a wavelength corresponding to the band gap.
- ultrafine particles with a particle size of 20 nm or less, more preferably 1 Onm or less are suitably used. .
- the band gap of the Balta semiconductor is preferably in the range of 1. OeV—3 OeV. If the value is less than 1.0 eV, the fluorescence wavelength shifts too sensitive to a change in particle size when the nanocrystal is formed, which is not preferable in that production control is difficult. On the other hand, if it exceeds 3. OeV, it emits fluorescent light of a shorter wavelength than the near ultraviolet region, does not emit light, and is not preferable in that it is difficult to apply as a color light emitting device.
- the band gap of a Balta semiconductor is a value determined at 20 ° C. by measuring the light absorption of a Balta semiconductor sample and using the photon energy corresponding to the wavelength at which the absorption coefficient rises significantly. .
- a compound of a group IV element, a group Ila element, or a group VIb element of the long period type periodic table is used as a semiconductor material.
- Specific materials include crystals of SiGe, MgS, ZnS, MgSe, ZnSe, A1P, GaP, AlAs, GaAs, CdS, CdSe, InP, InAs, GaSb, AlSb, ZnTe, CdTe, InSb, and the like. Mixed crystal having the same element or compound power.
- A1P, GaP, Si ⁇ ZnSe, AlAs, GaAs, CdS, InP, ZnTe, AlSb, CdTe can be mentioned, and among them, a direct transition type semiconductor, ZnSe, GaAs, CdS, InP, ZnTe and CdTe are particularly preferred in terms of high luminous efficiency.
- the nanocrystal of the semiconductor material can be produced by a known method, for example, the method described in US Patent No. 6,501,091.
- a precursor solution in which trioctylphosphine (TOP) is mixed with trioctylphosphine selenide and dimethylcadmium is heated to 350 ° C and trioctylphosphine oxide (TOPO) is heated. There is a way to put it.
- TOP trioctylphosphine
- TOPO trioctylphosphine oxide
- Another example of the semiconductor nanocrystal used in the present invention is a core Z-shell type semiconductor nanocrystal. It has a structure in which the surface of a core fine particle made of, for example, CdSe (band gap: 1.74 eV) is covered with a shell of a semiconductor material having a large band gap such as ZnS (band gap: 3.8 eV). As a result, the effect of confining electrons generated in the core fine particles is easily exhibited.
- the core Z-shell type semiconductor nanocrystal can be manufactured by a known method, for example, a method described in US Pat. No. 6,501,091.
- a CdSe core ZZnS shell structure it can be manufactured by adding a precursor solution obtained by mixing getyl zinc and trimethylsilyl sulfide to TOP and heating the TOPO solution in which CdSe core particles are dispersed to 140 ° C.
- the surface may be modified with a metal oxide such as silica or an organic substance.
- Surface may be modified or coated with long-chain alkyl group, phosphoric acid, resin, etc.
- the above-mentioned phosphor fine particles may be used alone or in a combination of two or more.
- the transparent medium is a medium in which the semiconductor nanocrystals are dispersed and held, and a transparent material such as glass or transparent resin can be selected.
- a resin such as a non-curable resin, a thermosetting resin or a photo-curable resin is preferably used.
- oligomer or polymer melamine resin phenol resin, alkyd resin, epoxy resin, polyurethane resin, maleic acid resin, polyamide resin, polymethyl methacrylate, polymethyl resin, etc.
- examples include acrylate, polycarbonate, polyvinyl alcohol, polyvinylpyrrolidone, hydroxyethylcellulose, carboxymethylcellulose, and the like, and copolymers containing monomers forming them as constituent components.
- a photocurable resin For the purpose of patterning the fluorescence conversion medium, a photocurable resin can be used.
- an acrylic acid or methacrylic acid-based photopolymerization type having a reactive butyl group and a photo-crosslinking type such as a polycalyxate bur containing a photosensitive agent are usually used.
- a photosensitive agent is not contained, a thermosetting type may be used.
- a fluorescent conversion medium in which phosphor layers separated from each other are arranged in a matrix is formed. Therefore, as the matrix resin (transparent medium), it is preferable to use a photocurable resin to which a photolithography method can be applied.
- One of these matrix resins may be used alone, or a plurality of them may be used as a mixture.
- the preparation of the fluorescence conversion medium is carried out by mixing and dispersing the phosphor fine particles and the matrix resin (transparent medium) using a known method such as a mill method or an ultrasonic dispersion method. Do. At this time, a good solvent for the matrix resin can be used.
- the dispersion liquid of the phosphor fine particles is formed on a support substrate by a known film formation method, for example, a spin coating method, a screen printing method, or the like, to produce a fluorescence conversion medium.
- an ultraviolet absorber, a dispersant, a leveling agent, and the like may be added to the fluorescence conversion medium in addition to the phosphor fine particles and the transparent medium.
- a semiconductor material typified by CdSe exhibits a very large refractive index of about 2.5-4 in the visible light region.
- the refractive index of the transparent medium serving as the dispersion medium of the semiconductor nanocrystal is usually in the range of 1.4.1.6. Therefore, in order to absorb the emitted light sufficiently, the refractive index of the fluorescent conversion medium gradually increases as the concentration of the semiconductor nanocrystals in the fluorescent conversion medium increases, and the fluorescent component confined inside the fluorescent conversion medium Increase.
- FIG. 4 is a diagram illustrating a fluorescent component confined inside the fluorescence conversion medium.
- fluorescence is emitted from the fluorescent fine particles 12 isotropically.
- the refractive index of the fluorescence conversion medium 1 is n
- the total fluorescence components emitted from the fluorescent fine particles 12 focus on the fluorescence component emitted in a direction inclined by an angle ⁇ ⁇ from the normal direction to the surface of the fluorescence conversion medium. Then, the case where the fluorescence intensity is observed from the air layer outside the fluorescence conversion medium 1 is considered.
- the critical angle ⁇ can be defined by the following equation (1).
- the refractive index of the air layer is about 1.0.
- the critical angle ⁇ ⁇ changes depending on the refractive index n of the fluorescence conversion medium 1.
- the light component is totally reflected at the interface of the fluorescence conversion medium and is confined inside the film.
- FIG. 5 is a diagram showing the relationship between the refractive index of the fluorescence conversion medium and the amount of the fluorescent component taken out of the fluorescence conversion medium.
- the refractive index of the transparent medium is 1.6 and the refractive index of the fluorescence conversion medium is 1.6
- the amount of fluorescent component extracted outside the film [7? (Fluorescence conversion medium m (transparent medium)] Is calculated as 1.
- the fluorescence intensity inside the fluorescence conversion medium increases as the concentration of the phosphor fine particles in the film increases, but at a certain concentration or higher, the excitation light is sufficiently absorbed, and the fluorescence intensity does not increase and saturates. I do.
- Fig. 6 shows the results of measuring the absorption spectrum and the fluorescence spectrum of a solution in which CdSe nanocrystal fine particles are diluted and dispersed in toluene. As shown by the hatched portion in FIG. 6, both spectra have an overlapping portion. That is, the semiconductor nanocrystal self-absorbs the fluorescence emitted by itself. Therefore, as the concentration of nanocrystals in the fluorescence conversion medium increases, this self-absorption cannot be ignored, and the fluorescence conversion efficiency decreases.
- parameters that affect both the influence of the refractive index and the effect of self-absorption of the semiconductor nanocrystals are different types of semiconductor nanocrystals having different particle diameters and light absorption coefficients.
- the value obtained by dividing the product of the volume ratio C (%) of the phosphor fine particles and the film thickness d ( ⁇ m) of the fluorescence conversion medium by the cube of the particle size r (nm) of the phosphor fine particles, that is, C'dZr 3 comprising an amount proportional to the number of phosphor particles present in the film thickness direction of the fluorescent conversion medium was found to be important.
- FIG. 7A-7D show the results obtained when a fluorescence conversion medium using three types of semiconductor nanocrystal materials having different particle diameters and light absorption coefficients is excited with monochromatic light having a wavelength of 470 nm.
- FIG. 3 is a diagram showing the relationship between C'dZr3 and fluorescence intensity.
- Figure 7A shows the case where the influence of the refractive index of the semiconductor nanocrystal and the effect of self-absorption are not considered.
- Figure 7B shows the case where the effect of the refractive index of the semiconductor nanocrystal is considered only and the effect of the self-absorption is not considered.
- FIG. 7C shows the relationship when considering only the effect of self-absorption without considering the effect of the refractive index of the semiconductor nanocrystal
- FIG. 7D shows the relationship when considering both effects.
- FIG. 7A shows a case where neither the influence of the refractive index of the semiconductor nanocrystal nor the influence of self-absorption is taken into account.
- C'dZr 3 exceeds a certain value, the fluorescence intensity is saturated to a constant value. This is because the excitation light is sufficiently absorbed when the amount of the fine particles exceeds a certain amount.
- the power varies depending on the type and particle size of the semiconductor nanocrystal. Generally, it is understood that the fluorescence intensity is saturated when the C'dZr 3 power exceeds 5. That is, there is no sense to fill the amount C'dZr 3 is more than 5 in the fluorescent conversion medium.
- FIG. 7B considers only the effect of the refractive index of the semiconductor nanocrystal and the effect of self-absorption. This is not the case.
- the refractive index of the fluorescence conversion medium gradually increases, and the fluorescence generated in the medium is confined inside the medium.
- Force C'dZr 3 varies depending on the type and particle size of the semiconductor nanocrystal
- FIG. 7C shows a case in which the influence of the refractive index of the semiconductor nanocrystal is not considered, but only the effect of self-absorption.
- FIG. 7D is a diagram showing a relationship when both effects are considered. It can be seen that it is affected by the two effects of refractive index and self-absorption, and that C'dZr 3 exceeds 5 significantly impairs the fluorescence intensity.
- the preferred range of C'dZr 3 varies depending on the material of the semiconductor nanocrystal.
- the upper limit of C'dZr 3 becomes small, 0.4 ⁇ possible force S preferably C • d / r 3 ⁇ 3.
- 0, 0. 5 ⁇ C'd / r 3 is more preferably 2.5.
- the upper limit of C'dZr 3 can be made larger than that of CdSe, and 0.5 ⁇ Cd / r 3 ⁇ 5.0. It is more preferable that 1.5 ⁇ C • d / r 3 ⁇ 4.5.
- the thickness d of the fluorescence conversion medium is a force that can be appropriately adjusted according to the volume ratio C and the particle size r of the phosphor fine particles, and is preferably 1 Pm to 500 Pm.
- the particle size of the phosphor fine particles contained in the fluorescence conversion medium can be determined, for example, by observing a cross section of the fluorescence conversion medium at a plurality of positions with a transmission electron microscope! Can be calculated by statistical processing.
- the volume ratio c can also be calculated by similar statistical processing of transmission electron microscope images.
- a color light emitting device according to a second embodiment of the present invention will be described.
- FIG. 8 is a schematic diagram of a color light emitting device according to the second embodiment of the present invention.
- the color light emitting device 100 includes a light source unit 2 that emits visible light, and a fluorescence conversion unit 10 that receives light (excitation light) emitted from the light source unit 2 and emits fluorescence of a longer wavelength.
- the fluorescence conversion unit 10 is the same as the fluorescence conversion medium of the above-described first embodiment.
- an organic EL element As the light source unit 2, one that emits visible light can be used, and for example, an organic EL element, an inorganic EL element, a semiconductor light emitting diode, a fluorescent display tube, or the like can be used.
- an EL element using a transparent electrode on the light extraction side specifically, includes a light reflective electrode, a light emitting layer, and a transparent electrode opposed to the light reflective electrode so as to sandwich the light emitting layer.
- Organic EL elements and inorganic EL elements are preferred.
- FIG. 9 is a schematic diagram showing a configuration of an organic EL device.
- the organic EL element 20 has a configuration in which a light-reflective electrode 21, an organic luminescent medium 22, and a transparent electrode 23 are laminated in this order on a substrate (not shown).
- the organic EL element 20 supplies electrons and holes to the organic luminescent medium 22 by applying a voltage between the light-reflective electrode 21 and the transparent electrode 23, and recombines the electrons and holes. It emits light.
- the light generated in the organic light emitting medium 22 is extracted from the transparent electrode 23.
- the light reflective electrode 21 By forming the light reflective electrode 21, the light inside the EL element 20 can be efficiently extracted to the outside.
- the organic light emitting medium can be defined as a medium including an organic light emitting layer capable of emitting EL light by recombination of electrons and holes.
- the powerful organic luminescent medium can be formed by, for example, laminating the following layers on an anode.
- the configuration (iv) is usually preferably used because higher emission luminance is obtained and durability is excellent.
- Examples of the light-emitting material of the organic light-emitting layer in the organic light-emitting medium include a p-quarterphenyl derivative, a p-quinkphenyl derivative, a benzothiazole compound, a benzimidazole compound, a benzoxazole compound, and a metal chelate.
- organic light-emitting materials 4,4'bis (2,2-di-t-butylphenol-biphenyl) biphenyl (abbreviated as DTBPBBi) or an aromatic dimethylidin-based compound is used.
- 4,4,1-bis (2,2-diphenyl-biphenyl) biphenyl (abbreviated as DPVBi) and derivatives thereof are more preferred.
- an organic light-emitting material having a distyrylarylene skeleton or the like was used as a host material, and the host material was doped with a fluorescent dye having a strong blue power up to red as a dopant, for example, a coumarin-based material or a fluorescent dye similar to the host. It is also preferable to use materials in combination. More specifically, it is preferable to use the above-described DPVBi or the like as a host material, and to use N, N-diphenylaminobenzene (abbreviated as DPAVB) or the like as a dopant.
- DPAVB N, N-diphenylaminobenzene
- the hole injection layer of the organic light-emitting medium 1 X 10 4 - 1 X 10 6 VZcm ranging hole mobility force 1 X 10- 6 cm 2 ZV measured when a voltage is applied ' It is preferable to use a compound having an ionization energy of 5.5 eV or less for seconds or more. By providing such a hole injecting layer, hole injection into the organic light emitting layer becomes good, and high light emission brightness can be obtained, or low voltage driving becomes possible.
- the constituent material of such a hole injection layer include a vorphyrin conjugate, an aromatic tertiary amine compound, a styrylamine compound, an aromatic dimethylidin compound, and a condensed aromatic ring compound, for example.
- a vorphyrin conjugate an aromatic tertiary amine compound, a styrylamine compound, an aromatic dimethylidin compound, and a condensed aromatic ring compound, for example.
- NPD 4,4'bis [N- (1naphthyl) N phenylamino] biphenyl
- MTDATA tris
- MTDATA [phenylamino] triphenylamine
- an inorganic compound such as p-type Si or p-type SiC as a constituent material of the hole injection layer.
- an organic semiconductor layer having a conductivity of 1 ⁇ 10-1 C) SZcm or more is provided between the above-described hole injection layer and the anode layer, or between the above-described hole injection layer and the organic light emitting layer. It is also preferable to provide them. By providing such an organic semiconductor layer, hole injection into the organic light emitting layer is further improved.
- the electron injection layer of the organic light-emitting medium, 1 X 10 4 - 1 X 10 6 VZcm electron mobility measured when the range of the voltage is marked Caro is, 1 X 10- 6 cm 2 ZV , It is preferable to use a compound having a ionization energy of 5.5 eV or more for seconds or more.
- a compound having a ionization energy of 5.5 eV or more for seconds or more By providing such an electron injection layer, electron injection into the organic light emitting layer becomes good, and high emission luminance can be obtained, or low voltage driving becomes possible.
- Specific examples of the constituent material of such an electron injection layer include a metal complex of 8-hydroxyquinoline (A1 chelate: Alq), a derivative thereof, and an oxaziazole derivative.
- the adhesion improving layer in the organic light emitting medium can be regarded as one form of such an electron injection layer, that is, a layer made of a material having particularly good adhesion to the cathode among the electron injection layers. It is preferable to form a metal complex of 8-hydroxyquinoline or its derivative. Incidentally, in contact with the electron injection layer described above, the conductivity is also preferable to provide a 1 X 10- 1C) S / C m or more organic semiconductor layers. By providing such an organic semiconductor layer, the electron injection property to the organic light emitting layer is further improved.
- the thickness of the organic luminescent medium can be set preferably in the range of 5 nm to 5 ⁇ m.
- the thickness of the organic luminescent medium is set to a value in the range of lOnm-3 m, more preferably 20 nm-.
- the first electrode is a light-reflective electrode having light reflectivity, and is not required to be transparent.
- any of the element configurations in which the light-reflective electrode is an anode and a transparent electrode described later is a cathode, and where the light-reflective electrode is a cathode and the transparent electrode is an anode can be adopted.
- a metal having a work function required for hole injection is used.
- a work function value of 4.6 eV or more is desirable. More specifically, gold, silver, copper, iridium, molybdenum, niobium, nickel, osmium, rhodium, platinum, ruthenium, tantalum, tungsten or aluminum
- Metal hydrides such as metals and their alloys, indium and Z or tin oxidants (hereinafter abbreviated as i ⁇ ), copper iodide, polypyrrole, polyaline, poly (3-methylthiophene), etc. And a laminate thereof.
- a material having a small work function! (4 eV or less), a metal, an alloy, an electrically conductive compound, and a mixture thereof is used as an electrode material.
- electrode materials include one or more of sodium, sodium-potassium alloy, magnesium, lithium, magnesium-Z silver alloy, aluminum-Z aluminum oxide, aluminum-Z lithium alloy, indium, and rare earth metals. Is mentioned.
- a transparent electrode material made of a transparent conductive material is used for the second electrode.
- the transparent electrode is made of a material having a transmittance of 10% or more, preferably a material having a transmittance of 60% or more, in order to efficiently extract light emitted from the organic light emitting layer.
- ITO indium tin oxide
- IZO indium zinc oxide
- Culn indium copper
- SnO tin oxide
- ZnO acid oxide Zinc
- antimony oxide SbO, SbO, SbO
- AlO aluminum oxide
- one kind of metal such as Pt, Au, Ni, Mo, W, Cr, Ta or Al alone or in combination of two or more kinds in order to reduce the resistance within a range that does not impair the properties.
- a low work function layer made of a low work function material for injecting electrons into the organic light emitting layer may be used in combination.
- a material having a small work function because of easy electron injection for example, a material less than 4. OeV is used. It is preferable to form a thin film on the organic light-emitting medium so as to have a sufficient transmittance, and to stack a transparent electrode thereon.
- the work function of a transparent oxide conductor such as ITO or ZnO is 4.6 eV or more, which makes it difficult to use as a cathode.
- Low work function materials include aluminum, norium, calcium, cerium, erbium, europium, gadolinium, hafnium, indium, lanthanum, magnesium, silver, manganese, neodymium, scandium, samarium, yttrium, zinc, zirconium and the like.
- Metals, alloy compositions of these metals with other metals are also used. Particularly preferred are magnesium, silver and an alloy of magnesium and silver.
- the thickness of the transparent electrode is generally in the range of 5 to 1000 nm, preferably 10 to 500 nm.
- the low work function layer is generally set in the range of 100 nm, preferably in the range of 5 to 50 nm, and more preferably in the range of 5 to 30 nm.
- Exceeding the upper limit of the film thickness of each of them is not preferable from the viewpoint of efficiently extracting light from the organic light emitting layer. Further, if the thickness is less than the lower limit, it is not preferable from the viewpoint of suppressing damage to the organic light emitting layer when forming the transparent electrode layer.
- each layer of the organic EL element As a method for forming each layer of the organic EL element, a conventionally known method, for example, a formation method by a vacuum evaporation method, a sputtering method, a spin coating method, or the like can be used.
- a transparent medium that connects the transparent electrode and the fluorescence conversion medium may be formed as necessary.
- the transparent medium is used for the purpose of improving the smoothness of the surface of the fluorescence conversion medium.
- the transparent medium is a transparent material with a visible light transmittance of 50% or more, no An organic material, an organic material, a laminate thereof, or the like can be used as appropriate.
- an inorganic oxide layer an inorganic nitride layer, and an inorganic oxynitride layer are preferable.
- silica, anoremina, AION, SiAlON, SiNx (l ⁇ x ⁇ 2), SiOxNy (preferably 0. l ⁇ x ⁇ l, 0. l ⁇ y ⁇ l) are listed.
- silicone gel As the organic material, silicone gel, fluorocarbon liquid, acrylic resin, epoxy resin, silicone resin, or the like can be used.
- the transparent medium can be formed by a sputtering method, a CVD method, a sol-gel method, or the like.
- a spin coating method In the case of an organic material, it can be performed by a spin coating method, a printing method, a dropping method or the like.
- the layer thickness of the transparent medium is 0.01 ⁇ m to 10 mm, preferably 0.1 ⁇ m to lmm.
- FIG. 10 is a schematic diagram of a color light emitting device according to a third embodiment of the present invention.
- the color light emitting device 101 includes a light source unit 2 that emits visible light, and a fluorescence conversion unit 10 that receives light emitted from the light source unit 2 and emits fluorescence of a longer wavelength.
- the fluorescence conversion unit 10 is a laminate of the fluorescence conversion medium 1 according to the first embodiment and the color filter 3 for transmitting the fluorescent component emitted from the fluorescent conversion medium 1 and blocking other light components. I have.
- the external light of the light emitting device 101 causes the fluorescence conversion medium 1 to emit fluorescent light, and the light emitting device emits light and emits no light. In this case, it is possible to prevent a decrease in the brightness ratio at the time of, that is, the contrast ratio.
- Examples of the color filter used in the present invention include, for example, only the following dyes or a solid state in which the dyes are dissolved or dispersed in a binder resin.
- Red (R) dye perylene pigment, lake pigment, azo pigment, diketopyrrolopyrrole pigment, etc.
- Green (G) dye halogen-substituted phthalocyanine pigment, halogen-substituted copper phthalocyanine pigment, trifermethane-based basic dye, etc.
- Blue (B) dye copper phthalocyanine pigment, indanthrone pigment, indophenol Pigments, cyanine pigments, etc.
- the binder resin is preferably a transparent material (having a visible light transmittance of 50% or more).
- transparent resins polymers
- polymers such as polymethyl methacrylate, polyatarylate, polycarbonate, polybutyl alcohol, polyvinylpyrrolidone, hydroxyethyl cellulose, canoleboxy methinoresenolerose, and a photolithography method
- Photocurable resist materials having a reactive vinyl group, such as acrylic acid-based and methacrylic acid-based can be cited as photosensitive resins to which this is applicable.
- a printing ink medium
- a transparent resin such as polyvinyl chloride resin, melamine resin, or phenol resin is selected.
- the film is formed by a vacuum deposition or sputtering method through a mask having a desired color filter pattern.
- a fluorescent dye is used.
- the above resin and resist are mixed, dispersed or solubilized, formed into a film by a method such as spin coating, roll coating, or casting, and patterned or printed with a desired color filter pattern by a photolithography method. In general, patterning is performed with a desired color filter pattern by the above method.
- the thickness and transmittance of each color filter are preferably as follows.
- R film thickness 0.5-5.0 111 (transmittance 50% or more 761011111),
- a black matrix when providing a full-color light-emitting device that emits light of three primary colors of red, green, and blue, a black matrix can be used to improve a contrast ratio.
- FIG. 11 is a schematic view of a color light emitting device according to a fourth embodiment of the present invention.
- the color light emitting device 102 receives light emitted from the light source unit 2 that emits at least a blue component (wavelength 430 nm to 490 nm), and receives red (R), green (G), and blue (B) light. And a fluorescence conversion unit 10 that emits and transmits each color.
- the fluorescence conversion unit 10 has red (R), green (G), and blue (B) sub-pixels (pixels).
- the red (R) pixel includes the red fluorescence conversion medium 43 and the red color filter 33 having the above-described configuration, and receives light emitted from the light source unit 2 to emit red light.
- green (G) The pixel includes a green fluorescence conversion medium 42 and a green color filter 32, and receives light emitted from the light source unit 2 and emits green light.
- the blue (B) pixel emits blue light by transmitting only the blue component of the light emitted from the light source unit 2 only with the color filter 31.
- this color light emitting device 102 blue light is transmitted through only the color filter without color conversion of light emitted from the light source. This simplifies the manufacturing process of a light emitting device that does not require the formation of a blue fluorescence conversion medium in order to obtain three primary colors required for full color display.
- Each pixel can be formed by a known method.
- the red (R) and green (G) pixels are formed as a laminate of the fluorescence conversion medium and the color filter.
- the present invention is not limited to this. Both pixels or one of the pixels may be used.
- FIG. 12 is a schematic diagram of a color light emitting device according to a fifth embodiment of the present invention.
- the color light emitting device 103 is configured to emit light of at least a blue component (wavelength: 430 nm to 490 nm), and to emit light of at least one color in a green region to a red region by receiving light emitted from the light source unit 2.
- a fluorescence conversion medium 1 that transmits a part of the blue component of the light emitted from the light source unit 2.
- the fluorescence conversion medium 1 is a film in which phosphor particles 12, 13 are dispersed in a transparent medium 11.
- the phosphor fine particles 12 and 13 absorb the excitation light from the light source unit 2 and emit light (fluorescence) having a longer wavelength in a range from a green region to a red region.
- the particle diameter and the material of the phosphor fine particles are different between the phosphor fine particles 12 and 13 so that different light emission components of light emission A and light emission B can be emitted.
- the average particle diameter, volume ratio C, and thickness d of the fluorescent conversion medium of the phosphor fine particles 12 and the phosphor fine particles 13 are appropriately selected in the range of 0.4 ⁇ Cd / r 3 ⁇ 5.0.
- a part of the blue component of the light emitted from the light source unit 2 can be transmitted (transmitted light in the drawing).
- a color light emitting device that emits white light containing the three primary colors of light, blue (transmitted light), green (light emission A), and red (light emission B), in a well-balanced manner.
- FIG. 12 contains two types of different phosphor fine particles 12 and 13, only one type of phosphor fine particles that emit yellow light is dispersed, and color light emission that emits white light in combination with blue light transmitted from the light source unit is shown in FIG. It can also be a device.
- a transparent support substrate was prepared by forming ITO to a thickness of 130 nm on a 25 mm ⁇ 75 mm ⁇ I. 1 mm glass substrate by a sputtering method. Thereafter, the substrate was subjected to ultrasonic cleaning in isopropyl alcohol for 5 minutes, dried by blowing nitrogen, and subjected to UV ozone cleaning (UV300, manufactured by Samco International) for 10 minutes.
- UV ozone cleaning UV300, manufactured by Samco International
- the boat containing the TPD was heated to 215-220 ° C, and was vapor-deposited on a transparent support substrate at a vapor deposition rate of 0.1-0.3 nmZ seconds to form a 60-nm-thick hole injection layer. A film was formed. At this time, the temperature of the substrate was room temperature. A 40 nm layer of DPVBi was used as a host material on the hole injection layer without removing this from the vacuum chamber. At this time, the DPAVBi boat was heated at the same time, and the light emitting layer was mixed with DPAVBi as a light emitting dopant.
- the deposition rate of the dopant material DPAVBi was set to 0.1 to 0.13Z seconds, while the deposition rate of the host material DPVBi was set to 2.8-3. OnmZ seconds.
- the vacuum chamber was returned to atmospheric pressure, and a molybdenum resistance heating boat was newly added to the 8-hydroxyquinoline 'aluminum complex, which is the material of the adhesive layer. Placed, aluminum was mounted in a tungsten filament as further cathode material and vacuum the vacuum chamber to 1 X 10- 4 Pa.
- an 8-hydroxyquinoline ⁇ aluminum complex was deposited at a deposition rate of 0.01 to 0.03 nmZ seconds to form an adhesive layer with a thickness of 20 nm. Further, aluminum was deposited to a thickness of 150 nm to form a cathode.
- an organic EL light source was obtained.
- a voltage of 7 V was applied to the obtained light source, and the transparent support substrate side force was also measured by a spectral radiance meter, it showed a blue-green emission with a luminance of 230 nit and a chromaticity (0.1, 0.30).
- the peak wavelength of light emission was 470 nm.
- a pigment-based red color filter material (CRY-S840B, manufactured by Fuji Film Arch) is spin-coated on a 0.7 mm-thick glass plate. 1.2 ⁇ ) A substrate was obtained.
- CG-8510L a pigment-based green color filter material (CG-8510L, manufactured by Fuji Film Arch) was spin-coated on a 0.7 mm-thick glass plate, and after being exposed to ultraviolet light, beta-treated at 200 ° C. A green color filter (film thickness: 1.0 m) substrate was obtained.
- CdSe fine particles having a particle diameter of 5.2 nm and emitting red fluorescence having a fluorescence wavelength of 615 nm were charged into a transparent medium solution so that the weight ratio to the total solid content was 36.7 wt%, and dispersion treatment was performed. This was formed on the color filter film of the previously prepared red color filter substrate by a spin coating method, dried at 200 ° C for 30 minutes, and the fluorescent conversion substrate in which the red color filter and the fluorescent conversion medium were laminated was used. Obtained. The thickness of the fluorescence conversion medium was 10 m.
- This substrate was bonded via silicone oil having a refractive index of 1.53 so that the fluorescence conversion medium and the transparent support substrate of the organic EL light source prepared above faced each other.
- a voltage of 7 V was applied to the organic EL light source unit and measured with a spectral radiance meter, it emitted a good red light with a luminance of 118 nit and a chromaticity of 0.653, 0.345.
- the conversion efficiency defined by the ratio of the luminance after fluorescence conversion to the luminance of the light source was a good value of 51.5%.
- a fluorescence conversion substrate was obtained in the same manner as in Example 1, except that the weight ratio of CdSe to the total solid content was 28.2 wt% and the thickness of the fluorescence conversion medium was 20 m.
- the volume ratio of the phosphor fine particles in this medium was 7 vol%, and the value of C'dZr 3 was 1.00.
- a fluorescence conversion substrate was obtained in the same manner as in Example 1, except that the weight ratio of CdSe to the total solid content was 31.2 wt% and the thickness of the fluorescence conversion medium was 50 m. The volume ratio of 8 vol% of the fluorescent fine particles occupied in this medium, the value of C'dZr 3 is 2. flashing at 84.
- the fluorescence conversion performance was evaluated in the same manner as in Example 1, good red light emission with a luminance of 74 nit and chromaticity (0.659, 0.341) was shown. Conversion efficiency was a good value of 32.1% o
- a fluorescence conversion substrate was obtained in the same manner as in Example 1, except that the weight ratio of CdSe to the total solid content was 34.Owt%, and the thickness of the fluorescence conversion medium was 5 ⁇ m. The volume ratio of the phosphor fine particles in the medium was 9 vol%. (The value of 171: 3 was 0.32.
- the fluorescence conversion performance was evaluated in the same manner as in Example 1. The conversion efficiency was a good value of 42.3%, but the y-coordinate value of the chromaticity could not fall below 0.35. It wasn't red.
- a fluorescence conversion substrate was obtained in the same manner as in Example 1, except that the weight ratio of CdSe to the total solid content was 47.9 wt%, and the thickness of the fluorescence conversion medium was 50 m.
- This substrate was bonded via silicone oil having a refractive index of 1.53 so that the fluorescence conversion medium and the transparent support substrate of the organic EL light source prepared above faced each other.
- Electric power to the organic EL light source Applying a pressure of 7 V and measuring with a spectral radiance meter, it showed good green light emission with a luminance of 248 nits and chromaticity (0.219, 0.667).
- the conversion efficiency defined by the ratio of the luminance after fluorescence conversion to the luminance of the light source was a good value of 108%.
- Example 4 a fluorescence conversion substrate was obtained in the same manner as Example 1, except that the weight ratio of CdSe to the total solid content was 17.9 wt% and the thickness of the fluorescence conversion medium was 50 m. Volume ratio of the fluorescent fine particles occupying the medium 4 vol%, the value of C'dZr 3 is been filed at 3.13.
- a fluorescence conversion substrate was obtained in the same manner as in Example 4, except that the weight ratio of CdSe to the total solid content was 21.5 wt% and the thickness of the fluorescence conversion medium was 5 ⁇ m. Volume ratio of the fluorescent fine particles occupying the medium 5 vol%, the value of C'dZr 3 is been filed at 0.39.
- Example 4 a fluorescence conversion substrate was obtained in the same manner as in Example 1, except that the weight ratio of CdSe to the total solid content was 28.2 wt% and the thickness of the fluorescence conversion medium was 50 m. Volume ratio of the fluorescent fine particles occupying the medium 7 vol%, the value of C'dZr 3 is been filed at 5.47.
- Example 6 InP microparticles having a particle size of 4.9 nm and emitting red fluorescence having a fluorescence wavelength of 616 nm were charged into a transparent medium solution so that the weight ratio to the total solid content was 32.6 wt%, and dispersion treatment was performed. This was formed on the color filter film of the previously prepared red color filter substrate by spin coating, dried at 200 ° C for 30 minutes, and the fluorescent conversion substrate in which the red color filter and the fluorescent conversion medium were laminated was used. Obtained. The film thickness of the medium of the fluorescence conversion film was 20 m. The volume ratio of 10 vol% of the fluorescent fine particles occupied in this medium, the value of C'dZr 3 is a flashing at 1.70.
- This substrate was bonded via silicone oil having a refractive index of 1.53 so that the fluorescence conversion medium and the transparent support substrate of the organic EL light source prepared above faced each other.
- a voltage of 7 V was applied to the organic EL light source section and measured with a spectral radiance meter, it showed a good red emission with a luminance of 112 nits and a chromaticity (0.654, 0.344).
- the conversion efficiency was a good value of 48.9%.
- a fluorescence conversion substrate was obtained in the same manner as in Example 6, except that the thickness of the fluorescence conversion medium was set to 50 / zm.
- a fluorescence conversion substrate was obtained in the same manner as in Example 6, except that the weight ratio of InP to the total solid content was 15.4 wt% and the thickness of the fluorescence conversion medium was 10 m.
- Comparative Example 6 A fluorescence conversion substrate was obtained in the same manner as in Example 6, except that the weight ratio of InP to the total solid content was 39.4 wt% and the thickness of the fluorescence conversion medium was 50 m. The volume ratio of 13 vol% of the fluorescent fine particles occupied in this medium, the value of C'dZr 3 is a flashing at 5.52.
- ZnTe microparticles having a particle size of 6.8 nm and emitting green fluorescence having a fluorescence wavelength of 529 nm were charged into a transparent medium solution so that the weight ratio with respect to the total solid content was 39.9 wt%, and dispersion treatment was performed. This was formed by spin coating on the color filter film of the green color filter substrate prepared earlier, dried at 200 ° C for 30 minutes, and the fluorescent conversion substrate in which the green color filter and the fluorescent conversion medium were laminated was used. Obtained. The thickness of the fluorescence conversion medium was 20 m.
- the volume ratio of the phosphor fine particles in this medium is l lvol%, and the value of C'dZr 3 is 0.70.
- This substrate was bonded via silicone oil having a refractive index of 1.53 so that the fluorescence conversion medium and the transparent support substrate of the organic EL light source prepared above faced each other.
- a voltage of 7 V was applied to the organic EL light source section and measured with a spectral radiance meter, it emitted a good green light with a luminance of 222 nits and a chromaticity (0.211, 0.658).
- the conversion efficiency defined by the ratio of the luminance after fluorescence conversion to the luminance of the light source was a favorable value of 96.7%.
- Example 8 a fluorescence conversion substrate was obtained in the same manner as in Example 8, except that the thickness of the fluorescence conversion medium was changed to 50 / zm.
- the volume ratio of the phosphor fine particles in this medium is l lvol%, and the value of C'dZr 3 is 1.75.
- Comparative Example 7 A fluorescence conversion substrate was obtained in the same manner as in Example 8, except that the weight ratio of ZnTe to the total solid content was 25.5 wt% and the thickness of the fluorescence conversion medium was 20 m. The volume ratio of 6 vol% of the fluorescent fine particles occupied in this medium, the value of C'dZr 3 is a 0.38 to blink.
- a fluorescence conversion substrate was obtained in the same manner as in Example 8, except that the weight ratio of ZnTe to the total solid content was 72.6 wt% and the thickness of the fluorescence conversion medium was 50 m.
- Table 3 shows each parameter, conversion efficiency, and chromaticity of the fluorescence conversion media manufactured in the above Examples and Comparative Examples.
- the fluorescence conversion medium of the present invention and a color light emitting device using the same can be used for display screens of various display devices such as a consumer ⁇ , a large display display, and a display screen for a mobile phone.
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Abstract
Description
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US10/590,052 US20070164661A1 (en) | 1999-07-26 | 2005-03-10 | Fluorescent conversion medium and color light emitting device |
JP2006511931A JPWO2005097939A1 (ja) | 2004-03-30 | 2005-03-10 | 蛍光変換媒体及びカラー発光装置 |
EP05720496A EP1731583A4 (en) | 2004-03-30 | 2005-03-10 | FLUORESCENT CONVERSION MEDIUM AND COLOR LIGHT EMITTING DEVICE |
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JP2006236898A (ja) * | 2005-02-28 | 2006-09-07 | Fuji Electric Holdings Co Ltd | 色変換フィルター基板及び色変換フィルターを具備した有機発光素子 |
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WO2008015807A1 (fr) | 2006-08-03 | 2008-02-07 | Idemitsu Kosan Co., Ltd. | Milieu de conversion de fluorescence et appareil de luminescence en couleur l'utilisant |
JP2008041361A (ja) * | 2006-08-03 | 2008-02-21 | Idemitsu Kosan Co Ltd | 蛍光変換媒体及びそれを含むカラー発光装置 |
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WO2008023716A1 (fr) * | 2006-08-25 | 2008-02-28 | Idemitsu Kosan Co., Ltd. | Substrat de transfert pour dispositif d'affichage à électroluminescence organique |
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Also Published As
Publication number | Publication date |
---|---|
EP1731583A4 (en) | 2008-12-03 |
JPWO2005097939A1 (ja) | 2008-02-28 |
CN1938396A (zh) | 2007-03-28 |
TW200602476A (en) | 2006-01-16 |
KR20070004010A (ko) | 2007-01-05 |
EP1731583A1 (en) | 2006-12-13 |
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