WO2004107459A1 - 発光装置 - Google Patents
発光装置 Download PDFInfo
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- WO2004107459A1 WO2004107459A1 PCT/JP2004/007674 JP2004007674W WO2004107459A1 WO 2004107459 A1 WO2004107459 A1 WO 2004107459A1 JP 2004007674 W JP2004007674 W JP 2004007674W WO 2004107459 A1 WO2004107459 A1 WO 2004107459A1
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- light
- phosphor
- emitting device
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- light emitting
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- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
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- 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
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
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- 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
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- 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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- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1018—Heterocyclic compounds
- C09K2211/1025—Heterocyclic compounds characterised by ligands
- C09K2211/1029—Heterocyclic compounds characterised by ligands containing one nitrogen atom as the heteroatom
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- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1018—Heterocyclic compounds
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- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1018—Heterocyclic compounds
- C09K2211/1025—Heterocyclic compounds characterised by ligands
- C09K2211/1092—Heterocyclic compounds characterised by ligands containing sulfur as the only heteroatom
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/18—Metal complexes
- C09K2211/182—Metal complexes of the rare earth metals, i.e. Sc, Y or lanthanide
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- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
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- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/481—Disposition
- H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/48245—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic
- H01L2224/48247—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic connecting the wire to a bond pad of the item
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- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/481—Disposition
- H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/48245—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic
- H01L2224/48257—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic connecting the wire to a die pad of the item
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- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/12—Passive devices, e.g. 2 terminal devices
- H01L2924/1204—Optical Diode
- H01L2924/12044—OLED
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- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/181—Encapsulation
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/30—Technical effects
- H01L2924/301—Electrical effects
- H01L2924/3025—Electromagnetic shielding
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- H—ELECTRICITY
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- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/507—Wavelength conversion elements the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/52—Encapsulations
- H01L33/56—Materials, e.g. epoxy or silicone resin
Definitions
- the present invention relates to a light emitting device, and more particularly, to a light emitting device with improved durability of a phosphor. Background technology>
- Light-emitting devices using semiconductor light-emitting materials such as (LED) and semiconductor laser (LD) have high light-emitting efficiency and have the advantage of environmental measures such as the elimination of mercury. Light emitting devices that combine the above are being actively developed.
- a light emitting device using a combination of a semiconductor light emitting element such as an LED or an LD and an organic red phosphor containing a fluorescent complex such as a europium (Eu) complex having an anion of] 3-diketone as a ligand is known.
- Y 2 0 3 compared with fluorescent lamps the use of inorganic red phosphor such as Eu, is reported as a device capable to efficiently absorb light in the visible light from the near-ultraviolet light to obtain a high luminance emission (See Patent Documents 1 and 2).
- an object of the present invention is to provide a light emitting device that has a long life, has good color rendering properties, has a wide color reproduction range, and can generate high-intensity light emission.
- a phosphor having a fluorescent complex is not irradiated with light having a specific wavelength. That is, a light-emitting device to which the present invention is applied includes a light-emitting body that emits light in a visible light region from near ultraviolet light and a phosphor that contains at least one fluorescent complex that emits light by light from the light-emitting body. And characterized in that the phosphor is substantially not irradiated with light having a wavelength of 350 nm or less.
- the light-emitting body in the light-emitting device to which the present invention is applied is a semiconductor light-emitting element, and is a light-absorbing means for absorbing light having a length of 350 nm or less provided between the semiconductor light-emitting element and the phosphor?
- the semiconductor light emitting device is preferably a semiconductor light emitting device that emits light having a peak wavelength in a range from 360 nm to 470 nm.
- the phosphor is substantially irradiated with light having a wavelength of 350 nm or less.
- the luminous body is a discharge lamp.
- the phosphor is not substantially irradiated with light having a wavelength of 350 nm or less.
- the phosphor is preferably placed in a vacuum or an atmosphere of an inert gas. Further, it is preferable that the light emitting body and the phosphor are sealed with a resin.
- the fluorescent complex contained in the phosphor in the light emitting device to which the present invention is applied is preferably a rare earth ion complex.
- a rare earth ion complex is a rare earth ion complex having an ayuon derived from a 3-diketone or a carboxylic acid having a substituent having an aromatic ring as a ligand, having a substituent having an aromatic ring. Is preferred.
- the rare earth ion complex preferably uses a Lewis base as a trapping ligand.
- the rare earth ion complex is preferably a europium complex.
- the phosphor in the light emitting device to which the present invention is applied preferably includes a red phosphor containing a fluorescent complex, and a blue phosphor and a green phosphor.
- the present invention provides (a-1) a luminous body that emits light in the visible light region from near ultraviolet light and a phosphor containing at least one fluorescent complex that emits light by the light from the luminous body.
- (a-2) a luminous body that emits light in the near-ultraviolet light to the visible light region and a fluorescent light containing at least one fluorescent complex that emits light by the light from the luminous body.
- the light-emitting device is characterized by comprising: a resin-sealed body having a body inside; and (b) an ultraviolet shielding means for shielding the phosphor from ultraviolet rays.
- the ultraviolet shielding means is an ultraviolet absorbing layer provided outside or inside the container or outside the resin sealing body.
- Such an ultraviolet absorbing layer is preferably a resin layer containing an ultraviolet absorbing agent.
- the ultraviolet shielding means is a container or a resin sealing body formed of a light transmitting material containing an ultraviolet absorbent.
- the ultraviolet absorbing layer preferably contains one or more ultraviolet absorbing agents that absorb light having a wavelength of 400 nm or less.
- an organic compound causes a photochemical reaction by ultraviolet rays (for example, Akira Sugimori, “Organic Photochemistry”, 1991, Shokabo, Tokyo), and the photochemical reaction degrades the organic material. It is known that the shorter the wavelength of light, the greater the degree of this deterioration. You. Therefore, we examined the deterioration of the europium complex due to the ultraviolet light wavelength by adjusting the wavelength of the ultraviolet light irradiated by the ultraviolet cut filter under various conditions.In particular, in the case of light with a short wavelength of 350 nm or less, It became clear that the deterioration of organic materials was remarkable.
- the fluorescent complex used in the light emitting device to which the present invention is applied is provided with a means for substantially shielding the light of 350 nm or less in order to reduce the deterioration of the phosphor. It is extremely effective.
- a light source that does not emit light of substantially 350 nm or less, block light of 350 nm or less emitted from the light source with an ultraviolet absorbing layer, and use an ultraviolet absorbing layer to external light.
- an ultraviolet absorbing layer to external light.
- the transmittance at 350 nm is 5% or less from the transmission spectrum of the ultraviolet cut filter, it can be considered that the light is substantially shielded. Since the degradation due to ultraviolet rays also occurs in the ligand molecule, it is considered that other rare earth ion complexes other than the europium complex are similarly effective.
- the means by which the fluorescent complex used in the light emitting device to which the present invention is applied is substantially shielded from light having a wavelength of 350 nm or less with respect to light from the light emitting body includes, for example, 1 light emitting body and phosphor A UV-absorbing layer containing a UV-absorbing substance that substantially absorbs UV light of 350 nm or less, and blocks light of 350 ⁇ m or less from a discharge lamp such as a mercury lamp. And (2) a method using a semiconductor light emitting body such as an LED or an LD, which does not substantially emit light having a wavelength of 350 nm or less, as a light source.
- ultraviolet light from external light there is a method in which an ultraviolet absorbing layer is provided between the phosphor and the external light to block ultraviolet light of the external light.
- an ultraviolet absorbing layer is provided between the phosphor and the external light to block ultraviolet light of the external light.
- ultraviolet light from outside light shield ultraviolet light having a wavelength of 400 nm or less in consideration of measures against photodegradation of organic compounds such as resins coexisting in addition to the complex.
- a resin composition in which a fluorescent substance containing a fluorescent complex is mixed or dispersed in a resin on the upper side of the light-emitting element when used as a light-emitting element, a resin composition in which a fluorescent substance containing a fluorescent complex is mixed or dispersed in a resin on the upper side of the light-emitting element.
- a phosphor layer is formed as a coating, or the phosphor is mixed or dispersed in a sealing resin such as an epoxy resin covering the LED and LD.
- ultraviolet rays from external light can be blocked by laminating an ultraviolet absorbing layer on the phosphor layer or by including an ultraviolet absorbing substance in a sealing resin provided on the phosphor layer.
- an ultraviolet absorbing layer is formed so as to cover the outside of a sealing resin body having a light emitting body and a phosphor inside.
- the phosphor and the resin are liable to be deteriorated, so that ultraviolet light from outside light having a wavelength range of 400 nm or less is shielded, and extremely good light fastness can be obtained.
- an ultraviolet absorber is mixed with the light-transmitting material used for the lamp container, and an ultraviolet absorbing layer is provided on the outside or inside of the lamp container.
- ultraviolet absorption treatment such as the provision of ultraviolet rays
- the light resistance can be significantly improved by setting the inside of the lamp to a low oxygen concentration atmosphere by vacuum or inert gas replacement.
- the oxygen concentration is lOOOppm or less, preferably 100 ppm or less, more preferably 20 ppm or less.
- FIG. 1 is a diagram for explaining a light emitting device according to the first embodiment.
- FIG. 2 is a diagram for explaining a light emitting device according to the second embodiment.
- FIG. 3 is a diagram for explaining a light emitting device according to the third embodiment.
- FIG. 4 is a diagram showing the wavelength-transmittance behavior of the ultraviolet shielding filter.
- FIG. 5 is a diagram showing the wavelength-transmittance behavior of glass.
- FIG. 6 is a diagram showing a radiation spectrum of a light source of the light resistance tester. Symbols in the figure are: 10, 20, and 30 are light-emitting devices, 11, 21, and 31 are semiconductor light-emitting elements, 12 and 32 are phosphor layers, and 13 and 3 are, respectively.
- 14a is inert gas
- 14b, 23 is ultraviolet absorbing layer
- 15a, 15b, 25a, 25b, 35a, 35b is Conductive wire
- 16a, 26a, 36a are inner leads
- 16b, 26b, 36b are mount leads
- 17, 27, 37 are sealing resin parts
- 18, Reference numerals 28 and 38 denote blankets
- 19, 29, and 39 denote electrical contacts
- 22 denotes a phosphor
- 24 denotes an epoxy resin part
- 34b denotes a glass window.
- FIG. 1 is a diagram illustrating a light emitting device according to the present embodiment.
- the light emitting device 10 shown in FIG. 1 includes a blanket 18, an outer cap 13 that covers the top of the planket 18 and is formed in a dome shape with a light-transmitting material such as glass, and a blanket 1.
- the red phosphor is mixed and dispersed in the binder resin, and is formed by being sandwiched between the phosphor layer 12 of the coating applied to the inside of the outer cap 13 and the phosphor layer 12 and the outer cap 13.
- UV absorbing layer 1 4b And a conductive wire 15a for conducting between the inner lead 16a and the semiconductor light emitting element 11; and a conductive wire 15b for conducting between the semiconductor light emitting element 11 and the mount lead 16b.
- the inside of the outer cap 13 is It is filled with vacuum or an inert gas 14a such as nitrogen gas or argon gas.
- the semiconductor light emitting element 11 emits light in the near-ultraviolet light to visible light region. This light is absorbed by the phosphor contained in the phosphor layer 12 and emits longer wavelength visible light. Since fluorescent complexes such as rare-earth ion complexes used for phosphors deteriorate in the presence of oxygen, they are filled with an inert gas 14a inside the outer cap 13 to remove oxygen and remove light. Improve sex. By maintaining a vacuum state instead of filling with the inert gas 14a, the light resistance of the phosphor layer 12 can be improved, and the durability of the light emitting device 10 can be improved. It is preferable to remove oxygen so that the oxygen concentration inside the outer cap 13 is 100 pm or less, preferably 20 pm or less.In such an atmosphere, the light resistance of the fluorescent complex is significantly improved. I do. In addition, light resistance improves even under low humidity.
- a semiconductor laser (LD), a light emitting diode (LED), or the like is used as the semiconductor light emitting element 11 that emits light in the near-ultraviolet to visible light region.
- the semiconductor light emitting device 11 having an excessively short peak wavelength is not preferable because the complex and the organic compound such as the binder resin tend to be easily deteriorated by light.
- the peak wavelength is too long, the excitation energy required for the emission of the fluorescent complex cannot be obtained, and the phosphor cannot emit light.
- the emission peak wavelength of the semiconductor light emitting device 11 is preferably in the range of 360 nm to 470 nm, and particularly, an LD or LED having a peak wavelength of 380 nm to 470 nm is preferred.
- the phosphor layer 12 is provided in the form of a film formed by applying a resin composition comprising a fluorescent complex and a binder resin to the inside of the outer cap 13.
- the fluorescent complex is not particularly limited, but usually a rare earth ion complex which is a complex of one or more kinds of ligand anions and ions of a trivalent rare earth element is used.
- the rare earth element include Sm, Eu, Tb, Ey, and Tm.
- an ionic complex of Eu (Europium) element as the red phosphor, a Tm (Li) element as the blue phosphor, and a Tb (Terbium) element as the green phosphor is preferred.
- an inorganic phosphor can be appropriately used in the phosphor layer 12 in addition to the rare earth ion complex.
- rare earth ion complexes europium complex is particularly preferred as a red phosphor that emits light with high luminance when irradiated with near-ultraviolet light, which is difficult with inorganic phosphors.
- the rare earth ion complex is preferably a complex having a ligand of an anion of J3-diketone having a substituent containing an aromatic ring or a carboxylate ion having a substituent containing an aromatic group.
- Examples of the complex having an anion of ⁇ -diketone having a substituent containing an aromatic ring as a ligand include, for example, a compound represented by any one of the following general formulas (1), (2) and (3). Europium complex.
- the 3-diketone having a substituent containing an aromatic ring in formulas (1), (2) and (3) preferably has at least one aromatic group, and further has at least one aromatic group.
- the aromatic hydrocarbon compound include benzene, naphthalene, and funanthrene.
- the aromatic heterocyclic compound include a heterocyclic compound containing an oxygen, nitrogen, and sulfur atom such as furan, thiophene, pyrazoline, pyridine, force / levazonole, dibenzofuran, and dibenzothiophene.
- substituent of the aromatic hydrocarbon compound or the aromatic heterocyclic compound examples include alkyl groups such as methyl, ethyl, propyl, and butyl; fluoroalkyl groups such as trifluoromethyl and pentafluoromethyl; Alkoxy groups such as benzyl, ethoxy, etc .; aryloxy groups such as benzyl and phenethyl; hydroxyl groups; aryl groups; acetyl groups such as acetyl and propionyl; acysiloxy groups such as acetyloxy, propionyloxy and benzoyloxy; Alkoxycarbonyl group; aryloxy such as phenoxycarbonyl Aminocarbonyl; substituted amino groups such as dimethylamino, getylamino, methylbenzylamino, diphenylamino, acetylmethylamino; substituted thio groups such as methylthio, ethylthio, phenyl
- the same substituent (excluding the halogen group) as the substituent of the aromatic hydrocarbon compound or the aromatic heterocyclic compound described above can be mentioned.
- Specific examples (1 to 19) of ⁇ -diketone having a substituent containing an aromatic ring are shown below. Note that the present embodiment is not limited to these.
- the capture ligand (R 2 ) comprising a Lewis base in the general formula (2) is not particularly limited, but is usually selected from Lewis base compounds having a nitrogen atom or an oxygen atom capable of coordinating to a europium ion. . Examples thereof include amines, aminoxides, phosphinoxides, sulfoxides and the like which may have a substituent.
- the two Lewis base compounds used as auxiliary ligands may be different compounds, respectively, or two compounds may form one compound.
- amines include pyridine, pyrazine, quinoline, isoquinoline, phenanthridine, 2,2′-biviridine, 1,10-phenanthroline, and the like.
- aminoxide examples include N-oxide of the above-mentioned amines such as pyridine-N-oxide and 2,2′-biviridine-N, N′-dioxide.
- phosphinoxide examples include trifenylphosphinoxide, trimethylphosphinoxide, trioctylphosphinoxide and the like.
- the sulfoxide include diphenyl sulfoxide, octyl sulfoxide, and the like.
- substituents to be substituted on these include the substituents described above. Among them, particularly, an alkyl group, an aryl group, an alkoxy group, an aralkyl group, an aryloxy group, a halogen group and the like are preferable.
- Lewis base compounds when two atoms coordinating in the molecule, for example, nitrogen atom, such as biviridine and phosphorus in the phenanthate, there are two auxiliary coordination groups in one Lewis base compound. You may make it work similarly to a ligand.
- substituent to be substituted on these Lewis base compounds include the substituents described above. Among them, particularly, an alkyl group, an aryl group, an alkoxy group, an aralkyl group, an aryloxy group, a halogen group and the like are preferable.
- Lewis base compounds used as auxiliary ligand specific examples of (R 2) (1 ⁇ 2 3) is illustrated in following.
- the Lewis base compound used in the present embodiment is not limited to these.
- ammonium ion in the general formula (3) examples include quaternary ammonium salts derived from alkylamines, arylamines, and aralkyl ions.
- substituents of amine include alkyl groups such as methyl, ethyl, propyl, butyl, hexyl, and octyl; substituted alkyl groups such as hydroxethyl and methoxethyl; aryl groups such as phenyl and tolyl; benzyl and phenethyl groups and the like.
- Examples of the complex having a carboxylate ion having a substituent containing an aromatic group, which is another compound of the rare earth ion complex, as a ligand include a europium complex represented by the following general formula (4). . ( Four )
- R 4 is a group containing at least one aromatic hydrocarbon ring which may have a substituent or an aromatic hetero ring which may have a substituent
- X is a divalent linking group.
- n is 0 or 1
- R 5 is a trapping ligand comprising a Lewis base.
- the ligand represented by the general formula (4) contains at least one aromatic ring. It is preferable from the viewpoint of the absorption wavelength region that a carboxylate ion having eight or more ⁇ electrons and constituting a ⁇ electron conjugate system is used as the ligand.
- the number of aromatic rings is not particularly limited as long as the triplet energy of the parent compound of carboxylic acid ion is higher than the excited state energy level of europium ion.
- an aromatic heterocyclic ring it is preferable to use an aromatic heterocyclic ring.
- the number of aromatic rings is four or more, for example, a compound such as pyrene having four or more aromatic rings has a low triplet energy excited by absorbing light from the semiconductor light emitting element 11. And the europium complex may not emit light.
- R 4 in the general formula (4) is derived from a tricyclic or less aromatic ring which may have a substituent or a tricyclic or less aromatic ring which may have a substituent. It is preferably a valent group.
- the aromatic ring include, for example, aromatic monocyclic hydrocarbons such as benzene, naphthalene, indene, biphenylene, acenaphthene, phenolelene, phenanthrene, tetralin, indane, and indene, and aromatic condensed polycyclic hydrocarbons.
- aromatic monocyclic hydrocarbons such as benzene, naphthalene, indene, biphenylene, acenaphthene, phenolelene, phenanthrene, tetralin, indane, and indene
- aromatic condensed polycyclic hydrocarbons such as benzoquinone, naphthoquinone, and anthraquinone.
- heteroaromatic ring examples include aromatic compounds such as furan, pyrrole, thiophene, oxazonole, isoxazonole, thiazonole, imidazonole, pyridine, benzofuran, benzothienefen, coumarin, benzopyran, canolebazonole, xanthen, quinoline, and triazine.
- aromatic compounds such as furan, pyrrole, thiophene, oxazonole, isoxazonole, thiazonole, imidazonole, pyridine, benzofuran, benzothienefen, coumarin, benzopyran, canolebazonole, xanthen, quinoline, and triazine.
- heterocyclic ring or an aromatic fused polycyclic heterocyclic ring.
- Examples of the substituent which R 4 may have include alkyl groups such as methyl, ethyl, propyl, and butyl; and fluoro groups such as trifluoromethyl and pentafluoroethyl.
- Alkyl group such as cyclohexyl group; ethur group; aryl group such as phenyl, chelyl, pyridle, etc .; alkoxy group such as methoxy and ethoxy; aryl group such as phenyl and naphthyl; benzyl; Aralkyl groups such as phenethyl; aryloxy groups such as phenoxy, naphthoxy and biphenyl-oxyl; hydroxyl groups; aryl groups; acetyl groups, propionyl, benzoyl, toluoyl, biphenyl propyl groups, etc .; acetoxy groups, benzoyloxy groups and benzoyl groups.
- Alkoxycarbonyl groups such as methoxycarbonyl and ethoxycarbon; aryloxycarbonyl groups such as phenoxycarbonyl; carboxyl groups; carbamoyl groups; amino groups; Substituted amino groups such as amino, getylamino, methylbenzylamino, diphenylamino, and acetylmethylamino; substituted thio groups such as methylthio, ethylthio, phenylthio, and benzonorethio; menolecapto groups; and ethinoresnorefoninole and phenylenolesnofonyl groups A substituted sulfur group; a cyano group; a halogen group such as fluoro, chloro, promo, or alkoxide.
- an alkyl group, an alkoxy group, an aryl group, a cycloalkyl group, a cycloalkyl group, an aryloxy group, an aralkyl group, an ethynyl group, and a halogen group are preferred.
- R 4 is not limited to these substituents. These substituents may further have a substituent.
- R 6 may be a divalent linking group, for example, an alkylene group or a divalent linking group derived from a ring-assembled hydrocarbon. And a divalent linking group derived from an aliphatic ring, an aromatic ring, or a heterocyclic ring.
- m is 0 or 1.
- the alkylene group for R s include methylene, ethylene and the like.
- the ring-assembled hydrocarbon include biphenyl, terphenyl, binaphthyl, cyclohexylbenzene, phenylnaphthalene and the like.
- Examples of the aliphatic ring include cyclopentane, cyclohexane, cycloheptane, norbornolenane, bicyclohexyl and the like.
- Examples of the aromatic ring include the same compounds as the specific examples of the aromatic ring described above.
- Examples of the heterocyclic ring include an aliphatic heterocyclic ring such as pyrazoline, piperazine, imidazolidine, and morpholine, in addition to the above-described aromatic heterocyclic ring.
- carboxylic acid from which the carboxylate ion in the general formula (4) is derived are exemplified below.
- the carboxylic acid used in the present embodiment is not limited to these.
- n is 0 in the general formula (4), the following carboxylic acids (1 to: L 0) are exemplified.
- the compounds include the following carboxylic acids (16 and 17).
- the carboxylic acid from which a carboxylate ion as a ligand in the general formula (4) is derived can be synthesized by a known synthesis method.
- a known synthesis method see, for example, New Experimental Chemistry, Vol. 14, “Synthesis and Reactions of Organic Compounds (II)”, p. 921 (1977), edited by The Chemical Society of Japan, or the fourth edition of Experimental Chemistry, Vol. 22, “Organic Synthesis”. IV, 1st page (1992), edited by The Chemical Society of Japan.
- Typical synthesis methods include the corresponding primary Oxidation reaction of coal and aldehyde, hydrolysis reaction of ester and nitrile, Friedel's reaction with acid anhydride, and the like.
- phthalic anhydride naphthalic anhydride, succinic anhydride, diphthalic anhydride,
- Carboxylic acids in which a carboxyl group is bonded to the ortho-position of the benzene ring are preferable because a complex having higher luminance can be easily obtained than the para-substituted product.
- Ar represents an aromatic hydrocarbon or an aromatic heterocycle.
- auxiliary ligand (R 5 ) composed of a Lewis base in the general formula (4) examples include the same compounds as the auxiliary ligand (R 2 ) composed of the Lewis base in the general formula (2) described above.
- the phosphor layer 12 includes, for example, a europium complex, and, if necessary, for example, in the case of a white light-emitting body, as described later, another blue fluorescent material.
- a green phosphor, and other rare earth ion complexes, and other inorganic phosphors are mixed or dispersed in a suitable binder resin to prepare a resin composition. It is arranged at a position such as an inner wall where light from the semiconductor light emitting element 11 is absorbed by coating or other method.
- the binder resin usually, a thermoplastic resin, a thermosetting resin, a photocurable resin and the like can be mentioned.
- a methacrylic resin such as polymethyl methacrylate
- a styrene-based resin such as polystyrene and styrene-acrylonitrile copolymer
- a polycarbonate resin such as polymethyl methacrylate
- a polyester resin such as polyethylene glycol dimethacrylate
- a phenoxy resin such as polystyrene and styrene-acrylonitrile copolymer
- Cellulose-based resins such as loin, senorelose acetate, senorelose acetate butylate, etc .
- epoxy resins such as phenolic resins, silicone resins and the like.
- the inner side of the glass outer cap 13 is covered with an ultraviolet absorbing layer 14 b containing an ultraviolet absorbing agent, and shields ultraviolet light from external light. Means are provided.
- the ultraviolet absorber contained in the ultraviolet absorbing layer 14b is not particularly limited.
- o-hydroxybenzophenone 2-hydroxy41-n-otaoxybenzophenone, 2-hydroxy 4—Benzophenones such as methoxybenzophenone; 2- (2, -hydroxyphenol) benzotriazonole, 2- (2′-hydroxy5 ′) benzotriazonole benzotriazonole , 2— (2, -hydroxy 3'-t-butynolee 5, 1-methyl phenol-nore) — 5-—black benzotriazolone, 2- (2, -hydroxy-5, methinolephen-benzo) benzo Benzotriazonole systems such as triazonole; etinole 2-cyano 3,3-diphenyl acrylate, 5-ethylhexyl_2-cyano 1-3,3-diphenyl acrylate No-acrylate type; salicylic acid type such as phenylsulfylate and 4-t-butylphenylsulfylate; 2-ethyl-5'-t
- the organic ultraviolet absorber can be used by dissolving it in a resin, transparency is good.
- dispersed particles having an average particle diameter of 100 nm or less as the inorganic ultraviolet absorber, an ultraviolet shielding layer having excellent transparency can be obtained.
- the surface of the particles of a photoactive compound such as titanium oxide is treated with an inert substance such as silica.
- UV absorbers can adjust the amount of UV Can adjust the shielding effect.
- benzophenone-based or zinc oxide may be used as an ultraviolet absorber that blocks ultraviolet light having a wavelength of 350 nm or less, and these may be used alone or in combination of two or more.
- UV absorbers By using these UV absorbers, light having a wavelength of 350 nm or less can be substantially blocked, but furthermore, organic compounds such as pinda resin are prevented from deteriorating, and the durability of the light emitting device is improved. In order to improve the efficiency, it is preferable to shield near-ultraviolet light having a wavelength of 400 nm or less, and this can be achieved by appropriately selecting from the above-mentioned ultraviolet absorbers.
- UV absorbers are usually used in admixture with a suitable resin.
- the resin used include a thermoplastic resin, a thermosetting resin, a photocurable resin, and the like.
- acrylic resins such as polymethyl methacrylate
- styrene resins such as polystyrene and styrene-acrylonitrile copolymer
- polycarbonate resins polyester resins phenoxy resins
- butyral resins Cellulose-based resins such as chinoresenololose, senorelose acetate, and ce / reulosyl acetate butylate
- epoxy resins phenolic resins, and silicone resins.
- epoxy resin, petital resin, polybutyl alcohol, and the like are preferable in terms of transparency, heat resistance, and light fastness.
- the light emitting device 10 to which the present embodiment is applied includes a blue phosphor and a green phosphor together with a red phosphor containing a rare earth ion complex such as a europium complex, and emits white light by combining these. You can do it.
- Known phosphors can be used as the blue phosphor or the green phosphor.
- Z n S Ag, S r 5 (P 0 4) 3 C 1: Eu, B aMg A 1 10 O 17: inorganic phosphors such as E u like.
- the green phosphor Z n S: Cu, Z n S: CuA l, B aMg A 1 10 O 17: E u
- inorganic phosphors such as M n.
- a thulium complex may be used as the blue phosphor
- an organic phosphor such as a terbium complex may be used as the green phosphor.
- a ligand of these complexes besides a known ligand, a carboxylate ion containing an aromatic group used as a ligand of the europium complex in the present embodiment can be used. In order to emit white light using these phosphors, the phosphor resin layer containing the phosphor mixture is fluoresced.
- the light body layer 12 may be used. Further, these phosphor resin layers may be arranged on the semiconductor light emitting element 11. Alternatively, only a resin layer containing a blue phosphor and a green phosphor may be disposed on the semiconductor light emitting device 11 and used in combination with the red phosphor layer 12.
- the phosphor layer 12 made of a fluorescent complex and a resin is provided in the form of a coating on the inside of the outer cap 13, but other embodiments may be adopted.
- an inorganic phosphor layer containing an inorganic phosphor is provided on the semiconductor light emitting element 11 provided above the mount lead 16b, and a phosphor comprising a phosphor containing a complex and a resin is further provided thereon.
- FIG. 2 is a diagram for explaining a light emitting device according to the second embodiment.
- the light emitting device 20 shown in FIG. 2 has a blanket 28, a mount lead 26 b and an inner lead 26 a attached to the planket 28, and is mounted on a lower portion of the blanket 28 and mounted.
- a sealing resin part 27 such as an epoxy resin filled in the cup above the mounting lead 26 b and fixing the semiconductor light emitting element 21, the inner lead 26 a and the semiconductor light emitting element 21
- the phosphor 22 must be shielded from ultraviolet light in the external light by the ultraviolet absorbing layer 23 provided outside the epoxy resin portion 24, and substantially shielded from light having a wavelength of 350 nm or less. It is preferable to shield ultraviolet rays of 400 nm or less from the viewpoint of protection of organic compounds such as resins.
- the ultraviolet absorbing layer 23 is not provided, light having a wavelength of 350 nm or less can be blocked by adding an ultraviolet absorbing agent to the epoxy resin portion 24.
- FIG. 3 is a diagram for explaining a light emitting device according to the third embodiment.
- the light-emitting device 30 shown in FIG. 3 is mounted on the lower part of the blanket 38 with the planket 38, the mount lead 36b and the inner lead 36a attached to the planket 38, and mounted.
- the light-emitting device 10 and the light-emitting device 20 to which this embodiment is applied can be used alone or in combination with a plurality of light-emitting devices, such as an illumination lamp, a backlight for a liquid crystal panel, and an ultra-thin illumination. It can be used as a lighting device and a display device. Examples>
- a mixed solution is prepared by mixing 10 parts of a europium (Eu) complex represented by the following formula, and 200 parts of a polybierptylal (Eslek BL-1 manufactured by Sekisui Chemical) methylethyl ketone solution (concentration: 20%). Then, 0.2 to 0.3 g of the mixed solution was applied inside a glass ampoule having a diameter of 14 mm, and dried to form a phosphor film. Then the ampoule was vacuum seal (2. 5 X 10- 5 Torr) to prepare a vacuum seal Garasuanpuru the E u complex phosphor coating is applied to the inner surface.
- Eu europium
- the transmittance at 395 nm which has the wavelength-to-transmittance behavior shown in Fig. 4, is 50 ° /.
- a UV-shielding filter (Atariprene HB-S006, manufactured by Mitsubishi Rayon Co., Ltd.), and then use a light-fastness tester (Ci4000, manufactured by Atlas) to filter light from the ultraviolet region to the visible region. Irradiation for 400 hours, 400 hours, 1000 hours, 2500 hours, 4500 hours, and 7000 hours, and then the fluorescence intensity of the phosphor containing the europium (Eu) complex was measured using a Hitachi fluorescence spectrometer F 4500 . Table 1 shows the results.
- Figure 6 shows the radiation spectrum of the light source (xenon lamp) of the light resistance tester.
- the fluorescence intensity of the phosphor is expressed as an index with the fluorescence intensity without light irradiation by a light resistance tester as 100. The closer the value is to 100, the better the light fastness.
- Example 1 A light resistance test was performed in the same manner as in Example 1 except that an ultraviolet shielding filter (cut filter SC 37 manufactured by Fuji Photo Film Co., Ltd.) having a transmittance of 50% at 370 nm and a transmittance of 2% at 350 nm was used. . Table 1 shows the results.
- an ultraviolet shielding filter cut filter SC 37 manufactured by Fuji Photo Film Co., Ltd.
- a light resistance test was performed in the same manner as in Example 1, except that an ultraviolet shielding filter (Toshiba glass filter UV33) having a transmittance of 330 nm and a transmittance of 50% was used. Table 1 shows the results.
- an ultraviolet shielding filter Toshiba glass filter UV33
- a phosphor layer was provided on a slide glass in the same manner as in Example 1, and an epoxy resin was laminated on the phosphor layer and thermally cured to provide a sealing layer having a thickness of 2 mm.
- An ultraviolet shielding filter (SC37) with a transmittance of 50% at 370 nm and a transmittance of 2% at 350 nm is put on this sealing layer, and the light irradiation time is 40 hours, 80 hours, and 120 hours.
- a light resistance test was performed under the same conditions as in Example 1, except that Table 2 shows the results. (Comparative Example 3)
- FIG. 5 shows the wavelength-transmittance behavior of glass (Pyrex (registered trademark) thickness 2 mm).
- Table 2 shows the results. Table 2
- Example 5 In the same manner as in Example 3, a phosphor layer and an epoxy resin encapsulation layer were provided on the top of an LED with an emission wavelength of 375 nm (NSHU 550, manufactured by Nichia Corporation). After 80 hours of light irradiation using the tester, the LED was turned on and the luminescence intensity of the phosphor was measured. The luminescence intensity was almost the same as before the light irradiation. (Example 5)
- the durability of the fluorescent substance containing a fluorescent complex can be improved, and the light emitting device which can generate
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP04735128A EP1641048A4 (en) | 2003-05-30 | 2004-05-27 | LIGHT-EMITTING COMPONENT |
US11/289,376 US20060132011A1 (en) | 2003-05-30 | 2005-11-30 | Light emitting device |
Applications Claiming Priority (2)
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JP2003-154571 | 2003-05-30 | ||
JP2003154571A JP2004352928A (ja) | 2003-05-30 | 2003-05-30 | 発光装置及び照明装置 |
Related Child Applications (1)
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US11/289,376 Continuation US20060132011A1 (en) | 2003-05-30 | 2005-11-30 | Light emitting device |
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WO2004107459A1 true WO2004107459A1 (ja) | 2004-12-09 |
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PCT/JP2004/007674 WO2004107459A1 (ja) | 2003-05-30 | 2004-05-27 | 発光装置 |
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US (1) | US20060132011A1 (ja) |
EP (1) | EP1641048A4 (ja) |
JP (1) | JP2004352928A (ja) |
CN (1) | CN1795566A (ja) |
WO (1) | WO2004107459A1 (ja) |
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Also Published As
Publication number | Publication date |
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US20060132011A1 (en) | 2006-06-22 |
CN1795566A (zh) | 2006-06-28 |
EP1641048A4 (en) | 2006-11-15 |
JP2004352928A (ja) | 2004-12-16 |
EP1641048A1 (en) | 2006-03-29 |
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