WO2005091387A1 - 発光装置および照明装置 - Google Patents
発光装置および照明装置 Download PDFInfo
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- WO2005091387A1 WO2005091387A1 PCT/JP2005/005233 JP2005005233W WO2005091387A1 WO 2005091387 A1 WO2005091387 A1 WO 2005091387A1 JP 2005005233 W JP2005005233 W JP 2005005233W WO 2005091387 A1 WO2005091387 A1 WO 2005091387A1
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- light
- phosphor
- light emitting
- emitting device
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- 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
- H01L2224/481—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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
- H01L2224/732—Location after the connecting process
- H01L2224/73251—Location after the connecting process on different surfaces
- H01L2224/73265—Layer and wire connectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
- H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01L2924/013—Alloys
- H01L2924/0132—Binary Alloys
- H01L2924/01322—Eutectic Alloys, i.e. obtained by a liquid transforming into two solid phases
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2933/00—Details relating to devices covered by the group H01L33/00 but not provided for in its subgroups
- H01L2933/0091—Scattering means in or on the semiconductor body or semiconductor body package
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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
- H01L33/50—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
- H01L33/58—Optical field-shaping elements
Definitions
- the present invention relates to a light emitting device using a light emitting element as a light source, and a lighting device using the light emitting device.
- a light emitting diode element which is a solid state light emitting element as a light emitting element as a light source
- resin is filled and solidified so as to cover the light emitting diode element.
- a surface mounting type is known.
- the blue light emitting diode element is covered with a resin layer in which resin contains an aggregate of yellow light emitting phosphors having an average particle diameter of 3 to 50 ⁇ m, and the blue light of the blue light emitting diode element is covered with the resin.
- a device that excites a yellow light-emitting phosphor by this blue light emission and mixes the color with yellow light obtained see, for example, Patent Document 2.
- the distribution state of the phosphor particles in the resin layer includes a sedimentation type in which the phosphor particles settle below the phosphor layer and a dispersion type in which the phosphor particles are dispersed in the entire resin layer. It is known! /
- Patent Document 1 JP-A-2002-43625 (Page 3, FIG. 1)
- Patent Document 2 Japanese Patent Application Laid-Open No. 2001-148516 (Page 4, FIG. 1)
- the blue light emitting diode element is viewed as a force perpendicular to the outer surface of the resin layer.
- the distance between the central part of the resin layer and the blue light emitting diode element is shorter than the distance between the peripheral part of the resin layer and the blue light emitting diode element.
- the blue light which has a high luminance, passes through the blue light, and the white light appears to be bluish.
- yellow light is distributed around the resin layer, resulting in uneven color.
- the sedimentation of the phosphor particles in the resin is affected by the particle size of the phosphor particles.
- the smaller the particle size of the phosphor particles the more the particles settle in the transparent resin, but the luminous efficiency of the phosphor itself generally decreases as the particle size decreases. Therefore, even if a dispersion type structure is obtained using phosphor particles having a small particle size, a decrease in the luminous efficiency of the phosphor itself will offset the effect of improving the luminous efficiency by the dispersion type. This cannot increase the luminous efficiency of the light emitting device.
- Patent Document 1 discloses that the average particle diameter is 3 to 50 m in order to suppress the variation in light emission. It is described that an aggregate of the phosphor of the present invention is used. However, an aggregate obtained by aggregating the phosphor particles in a resin does not necessarily increase the particle diameter of the phosphor, and thus the The luminous efficiency depends on the particle diameter of the phosphor particles before aggregation, and therefore, the luminous efficiency of the phosphor cannot be improved with the aggregate of the phosphor.
- the present invention has been made in view of the above points, and provides a light emitting device that can improve luminous efficiency and reduce color unevenness of a luminescent color, and a lighting device using the light emitting device. Aim.
- the light emitting device comprising: a light emitting element provided on the base; a diffusion layer covering the light emitting element; and a phosphor layer provided on the diffusion layer. It is.
- the light from the light emitting element is diffused by the diffusion layer covering the light emitting element, and the diffused light excites the phosphor layer disposed above the diffusion layer to emit light, thereby increasing the light emission efficiency. Is improved, and the color unevenness of the emission color is reduced.
- the light emitting element excites the phosphor with the emitted light to emit visible light.
- the light emitting element include a blue light emitting diode element and an ultraviolet light emitting diode element.
- the light-emitting element is not limited to these, and any light-emitting element that can excite a fluorescent substance to emit visible light can be used, depending on the application of the light-emitting device and the intended emission color. Can be used.
- the phosphor emits visible light when excited by light emitted from the light emitting element, and the phosphor emits light by mixing color of the emitted visible light and the light emitted by the light emitting element, or emitted from the phosphor.
- the desired light emission color of the light emitting device is obtained by the visible light or the mixed color of the visible light itself.
- the type of the phosphor is not particularly limited, and may be appropriately selected depending on the intended emission color, light emitted from the light emitting element, and the like.
- the diffusion layer and the phosphor layer may be formed by adding a diffusing agent or a phosphor to various transparent resins such as epoxy resin and silicone resin.
- the light emitting device according to claim 2 is the light emitting device according to claim 1, wherein the diffusion layer has a diffusing agent, and the added amount of the diffusing agent is 3 to 5% by mass.
- the addition amount of the diffusing agent By setting the addition amount of the diffusing agent to 3 to 5% by mass, a decrease in luminous efficiency is suppressed. Color shading is reduced while being controlled.
- the addition amount of the diffusing agent is less than 3% by mass, the diffusion effect is reduced and the effect of reducing color unevenness is reduced.
- the addition amount of the diffusing agent is more than 5% by mass, the absorption to the substrate is caused. Since the amount of light to be emitted increases, the luminous flux decreases.
- the light emitting device according to claim 3 is the light emitting device according to claim 1 or 2, wherein the bonding surface between the diffusion layer and the phosphor layer is formed as a concave arc surface that is concave toward the light emitting element. is there.
- the bonding surface between the diffusion layer and the phosphor layer is a concave arcuate surface recessed toward the light emitting element, the bonding area is increased as compared with a flat surface, and the bonding between the diffusion layer and the phosphor layer is increased. The strength is increased, and the separation between the diffusion layer and the phosphor layer is suppressed.
- the light-emitting device wherein the light-emitting element disposed on the base; and a phosphor that emits visible light when excited by light emitted from the light-emitting element; And a phosphor layer containing a phosphor having phosphor particles having a particle diameter in the range of 5 to 10 ⁇ m.
- the phosphor layer contains a phosphor having small particles of the phosphor converted into secondary particles and having a phosphor particle having a particle diameter in the range of 5 to 10 ⁇ m. Even if a resin having practical viscosity is used, the phosphor is surely dispersed, so that the luminous efficiency is improved and the color unevenness of the luminescent color is reduced.
- the secondary particles of the phosphor mean particles in which small particles of the phosphor are combined when the phosphor material is fired to produce the phosphor particles. Therefore, this is different from the case where the small particles of the phosphor are gathered and aggregated.
- a part or all of the small particles of the phosphor are converted into secondary particles.
- the ratio of the primary particles to the secondary particles is in the range of 1: 1 to 0: 1, and the particle size of the phosphor particles including the primary particles and the secondary particles is converted into secondary particles. Is preferably in the range of 5-10 ⁇ m.
- the particle size of the secondary particles of the phosphor indicates the maximum size. Use secondary particles with a maximum particle size in the range of 5-10 m.
- the particle size of the secondary particles (when primary particles are present, the particle size of the entire phosphor particles including the primary particles) is obtained by classification using a sieve or the like during the production of the phosphor.
- the particle size of the phosphor particles indicates a value measured by a force counter method.
- the secondary particles of such a phosphor are not easily separated because small particles are combined during the crystal growth process, and are close to primary particles having a particle diameter corresponding to the maximum diameter. High luminous efficiency.
- the surface area is larger than that of primary particles having a particle size equivalent to the maximum diameter, and therefore, the phosphor disperses, for example, the sedimentation rate in resin is low! Have.
- the light emitting device comprising: a light emitting element disposed on the base; and a phosphor that emits visible light when excited by light emitted from the light emitting element, and has two or more peaks. And a phosphor layer including a phosphor having phosphor particles having an existing particle size distribution.
- Phosphor particles having a particle size distribution having two or more peaks are particles having two or more particle size peaks when the particle size distribution of the phosphor particles is measured by, for example, a force counter method. It is.
- Such phosphor particles can be obtained, for example, by adding and mixing a phosphor powder having a smaller particle diameter to a phosphor powder mainly composed of the phosphor in the resin layer.
- the light emitting device according to claim 6 is the light emitting device according to claim 4 or 5, wherein the phosphor layer is filled with a resin having a viscosity in the range of 0.1-lOPa's. It is solidified.
- the light-emitting device is the light-emitting device according to any one of claims 4 to 6, wherein the light-emitting element has a light-emitting diode element that emits blue light; The body has a yellow! / And orange-emitting phosphor that emits yellow or orange light when excited by blue light emitted from the light-emitting diode element.
- a lighting device includes the light-emitting device according to any one of claims 1 to 7, and a lens disposed on the base.
- the light emitting device of claim 1 light from the light emitting element is diffused by the diffusion layer covering the light emitting element, and the diffused light forms the phosphor layer disposed on the diffusion layer. Since the light is excited to emit light, the luminous efficiency can be improved and the color unevenness of the emission color can be reduced.
- the addition amount of the diffusing agent is set to 3 to 5% by mass, so that a decrease in luminous efficiency can be suppressed. Color unevenness can be reduced.
- the bonding surface between the diffusion layer and the phosphor layer is a concave arc surface that is concave toward the light emitting element. Therefore, the bonding area can be increased as compared with the case of a flat surface, the bonding strength between the diffusion layer and the phosphor layer can be increased, and the separation between the diffusion layer and the phosphor layer can be suppressed.
- the phosphor layer includes a phosphor in which small phosphor particles are converted into secondary particles and the phosphor particles have a particle diameter in a range of 5 to 10 ⁇ m.
- the phosphor having the phosphor particles having a particle size distribution having two or more peaks by using the phosphor having the phosphor particles having a particle size distribution having two or more peaks, the dispersed state of the phosphor particles in the phosphor layer Therefore, the luminous efficiency can be improved, the color unevenness of the luminescent color can be reduced, or the amount of the phosphor used can be reduced.
- the phosphor layer is made of resin having a viscosity in the range of 0.1 to 10 OPa's. Since it is formed by filling and solidifying, the entrapment of air bubbles can be suppressed.
- the light emitting device of claim 7 the light emitting device according to any one of claims 4 and 6,
- white light is emitted by the blue light emitted by the light emitting diode element and the yellow light or orange light emitted by exciting the yellow or orange light emitting phosphor by the emitted blue light.
- the light emitting device of any one of the first to seventh aspects emits substantially uniform light, and the emitted light is controlled by the lens for light distribution. A desired amount of light can be obtained and light distribution can be controlled.
- FIG. 1 is an enlarged sectional view of a part of a light emitting device showing a first embodiment of the present invention.
- FIG. 2 is a plan view of the light emitting device.
- FIG. 3 is a cross-sectional view of the light emitting device.
- FIG. 4 is a table showing the relationship between the amount of a diffusing agent added to the light emitting device and the luminous flux.
- FIG. 5 is an explanatory view of secondary particles of a phosphor used in a light emitting device according to a second embodiment of the present invention.
- FIG. 6 is a view showing a typical particle size distribution of a phosphor having two or more particle size peaks in the above light emitting device.
- FIG. 7 is a cross-sectional view of the light emitting device.
- FIG. 8 is a cross-sectional view showing an example of an electrode connection structure of a light emitting element of the light emitting device.
- FIG. 9 is a cross-sectional view showing another example of the electrode connection structure of the light emitting element of the light emitting device.
- FIG. 10 is a cross-sectional view showing evaluation criteria for the dispersion state of the phosphor in the light-emitting device, as shown in (a)-(d).
- FIG. 11 is a table showing evaluation criteria for the example and the comparative example in the same light emitting device.
- FIG. 12 is a table showing the relationship between the combination ratio and the luminous efficiency of the light emitting device of the above example having two particle size peaks and one comparative example.
- FIG. 13 is a cross-sectional view of a light-emitting module of a lighting device according to a third embodiment of the present invention.
- FIG. 14 is a front view of the above light emitting module.
- FIG. 15 is a front view of the lighting device.
- FIG. 16 is an explanatory diagram of an example of combinations of materials for a light emitting module. Explanation of reference numerals
- FIG. 1 to FIG. 4 show a first embodiment of the present invention.
- Fig. 1 is an enlarged cross-sectional view of a part of the light-emitting device
- Fig. 2 is a plan view of the light-emitting device
- Fig. 3 is a cross-sectional view of the light-emitting device
- Fig. 4 shows the relationship between the amount of diffusing agent added to the light-emitting device and the luminous flux. It is a table.
- the light emitting device 11 has a base 12, on which a plurality of light emitting element disposing portions 13 are formed in a matrix of, for example, 3 rows and 3 columns. I have.
- the base 12 includes a flat substrate 14 made of aluminum (A1), nickel (Ni), glass epoxy resin, or the like having heat dissipation and rigidity, an insulating layer 15 formed on the substrate 14, And a reflector 17 formed on a substrate 14 on which the insulating layer 15 and the lead frame 16 are formed.
- a circuit pattern (wiring pattern) 16 a on the cathode side and the anode side is formed on the lead frame 16 by using an alloy of Cu and Ni, Au, etc. , 16b are formed.
- a light emitting diode element (blue light emitting diode chip) 18 which is a solid light emitting element and emits blue light, is disposed for each light emitting element disposing portion 13 as a light emitting element.
- Each light emitting diode element 18 is made of, for example, a gallium nitride (GaN) -based semiconductor that emits blue light.
- GaN gallium nitride
- Each light emitting diode element 18 has a bottom electrode electrically and mechanically connected to one of the circuit patterns 16a and 16b by die bonding, and an upper electrode electrically connected to the other of the circuit patterns 16a and 16b by a bonding wire 19. It is connected to the.
- the reflector 17 is formed by pouring a resin such as PBT (polybutylene terephthalate), PPA (polyphthalamide), or PC (polycarbonate) onto one surface of the substrate 14, and forms each of the light emitting element mounting portions 13.
- a housing portion 20 for housing each light emitting diode element 18 is formed.
- the accommodation portion 20 is formed in a truncated cone shape that gradually expands toward the opposite side with respect to the substrate 14.
- a lens holder part 21 for fixing a lens (not shown) is formed concentrically.
- Each of the housing sections 20 includes a diffusion layer 22 that covers the light emitting diode element 18 therein, and a phosphor layer 23 that is provided on the opening side of the housing section 20 above the diffusion layer 22. It is formed in two layers.
- the diffusion layer 11 is made of a thermosetting transparent resin such as a silicone resin or an epoxy resin having a light-transmitting property and a diffusing agent such as alumina (Al 2 O 3), Ti, Ca, SiAl, or Y. mass 0/0 (mass%)
- a thermosetting transparent resin such as a silicone resin or an epoxy resin having a light-transmitting property
- a diffusing agent such as alumina (Al 2 O 3), Ti, Ca, SiAl, or Y. mass 0/0 (mass%)
- the bonding surface (boundary surface) 24 with the phosphor layer 23 is formed as a curved surface that is recessed toward the light emitting diode element 18 (the lower surface in FIG. 3).
- the joint surface 24 has, for example, 1 ⁇ m to 5 ⁇ m between the curved upper end and the curved lower end;
- the phosphor layer 23 is a yellow color that receives blue light emitted from the light emitting diode element 18 and emits a yellow fluorescent light on a thermosetting transparent resin such as a silicone resin or an epoxy resin having a light transmitting property.
- a thermosetting transparent resin such as a silicone resin or an epoxy resin having a light transmitting property.
- the phosphor is added by required mass%. After the thermosetting of the diffusion layer 22, the phosphor is added The resin is filled in the accommodating section 20 and is cured by heat.
- a lighting device can be configured by combining the light emitting device 11 and a lens.
- each light emitting diode element 18 emits blue light.
- the blue light is diffused in multiple directions by the diffusion layer 22 and then enters the phosphor layer 23, where the yellow phosphor is excited from multiple directions to emit yellow light.
- the blue light from the light-emitting diode element 18 and the yellow light from the yellow phosphor are mixed in color, and emitted as white light from the housing section 20 to the outside.
- the minute light emission of the light emitting diode element 18 is diffused in multiple directions by the diffusion layer 22, and the yellow phosphor of the phosphor layer 23 is excited from multiple directions to become yellow. Since white light is emitted by emitting light and mixing the yellow light and blue light of the parentheses, the color unevenness of the white light can be reduced.
- the amount of the diffusing agent added to the resin of the diffusion layer 22 is 3 to 5% by mass, it is possible to reduce the color unevenness of white light without reducing the luminous flux.
- the table in Fig. 4 shows the change in luminous flux depending on the amount of the diffusing agent added. In the table of FIG. 4, the luminous flux when the addition amount of the diffusing agent was 0, that is, when there was no addition amount of the diffusing agent, was set to 100%.
- the diffusion layer 22 is removed and diffused into the phosphor layer 23.
- the white light emitted to the outside from the housing portion 20 was such that yellow light was distributed around the periphery thereof, and the effect of reducing color unevenness was not obtained.
- sample No.3, as No.4, amount of diffusion agent is 10 mass 0/0 (mass%), or 15 wt% and each of the diffusion layers 22, a two-layer structure of the phosphor layer 23
- amount of diffusion agent added is large, the viscosity of the diffusion layer 22 is increased, and uneven coating of the diffusion layer 22 occurs. For this reason, the white light radiated from the housing section 20 to the outside has yellow light distributed around the periphery thereof, and the effect of reducing color unevenness was not obtained.
- the addition ratio of the diffusing agent in the diffusion layer 22 is more than 5% by mass, the amount of light emitted from the light emitting diode element 18 that is absorbed by the substrate 14 made of, for example, Ni is increased. The luminous flux of white light radiated from the outside to the outside is reduced.
- a configuration may be adopted in which a light-reflecting material such as white paint is applied to the light-receiving surface of the substrate 14 and formed on the light-reflecting surface so as to prevent or suppress a reduction in luminous flux.
- a light-reflecting material such as white paint
- FIGS. 5 to 12 show a second embodiment of the present invention.
- Fig. 5 is an explanatory view of secondary particles of a phosphor used in a light emitting device
- Fig. 6 is a diagram showing a typical particle size distribution of a phosphor having two or more particle size peaks in the optical device
- Fig. 7 is a cross section of the light emitting device.
- FIG. 8 is a cross-sectional view showing an example of the electrode connection structure of the light-emitting element of the light-emitting device.
- FIG. 9 is a cross-sectional view showing another example of the electrode connection structure of the light-emitting element of the light-emitting device.
- FIG. 11 is a table of evaluation criteria for the light emitting device of the embodiment and the comparative example
- FIG. 12 is a light emitting device having two particle size peaks.
- the light emitting device 31 has a base 32, on which a light emitting element disposing portion 33 is formed.
- the base 32 has a substrate 34, lead terminals 35 formed on the substrate 34, and a reflector 36 formed on the substrate 34 on which the lead terminals 35 are formed.
- circuit patterns (wiring patterns) 35 a and 35 b on the cathode side and the anode side are formed in the light emitting element disposition portion 33.
- light-emitting diode elements (blue light-emitting diode chips) 37 which are solid-state light-emitting elements, are provided, respectively.
- the light emitting diode element 37 for example, a blue light emitting type light emitting diode chip, an ultraviolet light emitting type light emitting diode chip, or the like is used. It is preferable to apply the chip connection shown in FIG. 8 or the flip chip connection shown in FIG. 9 to the electrode connection structure of the light emitting diode element 37. According to these electrode connection structures, the light extraction efficiency to the front surface of the light emitting diode element 37 is improved.
- the back electrode of the light emitting diode element 37 is flip-chip connected to the circuit pattern 35a, and the upper electrode of the light emitting diode element 37 has the bonding wire 38 connected to the circuit pattern 35b.
- bump electrodes 39 such as solder bumps, Au bumps, and Au--Su eutectic bumps provided on the back surface of the light-emitting diode element 37 are flip-chip connected to the circuit patterns 35a and 35b.
- FIG. 7 shows a light emitting diode element 37 to which the chip connection shown in FIG. 8 is applied.
- a housing section 40 for housing the light emitting diode element 37 is formed in the light emitting element disposing section 33.
- the accommodation portion 40 is formed in a truncated cone shape that gradually expands toward the opposite side with respect to the substrate 34.
- the accommodation section 40 in which the light emitting diode elements 37 are provided is filled with a phosphor layer 42 as a transparent resin layer containing a phosphor 41, and the light emitting diode elements 37 are It is covered.
- the phosphor layer 42 is formed of, for example, silicone resin, epoxy resin, or the like.
- the electric energy applied to the light emitting diode element 37 is blue light by the light emitting diode element 37. Or ultraviolet light, and the light is converted into light having a longer wavelength by the phosphor 41 contained in the phosphor layer 42. Then, a color based on the color of light emitted from the light emitting diode element 37 and the emission color of the phosphor 41, for example, white light, is emitted from the light emitting device 31.
- the phosphor layer 42 containing the phosphor 41 is formed by adding and mixing the phosphor 41 to a liquid transparent resin such as silicone resin or epoxy resin, and storing such a liquid transparent resin in the container 40. It is formed by filling with a dispenser or the like. At this time, it is preferable to use a liquid transparent resin having a resin viscosity in the range of 0.1 to 10 OPa's in order to suppress the entrapment of air bubbles and the like. When the resin viscosity of the liquid transparent resin exceeds lOPa's, bubbles and the like are generated, and on the other hand, when the resin viscosity is less than 0.1 lpa's, even if the secondary particles of the phosphor 41 are used. It becomes difficult to form the dispersed phosphor layer 42.
- a liquid transparent resin such as silicone resin or epoxy resin
- the phosphor 41 contained in the phosphor layer 42 emits visible light when excited by light emitted from the light emitting diode element 37, for example, blue light or ultraviolet light.
- the phosphor layer 42 functions as a light emitting unit, and is disposed in front of the light emitting diode element 37 in the light emitting direction.
- the type of the phosphor 41 is appropriately selected according to the emission color of the intended light emitting device 31, and is not particularly limited.
- a yellow or orange light emitting phosphor is mainly used.
- a red light emitting phosphor may be used in addition to the yellow! / And orange light emitting phosphor.
- a yellow or orange light emitting phosphor for example, RE (Al, Ga) O: Ca phosphor (RE is
- YAG phosphors such as the following
- AE SiO: Eu phosphors AE is an alkaline earth element such as Sr, Ba, Ca, etc. The same applies hereinafter)
- a silicate phosphor such as is used.
- an RGB phosphor is mainly used.
- AE (PO) AE
- C1 a halophosphate phosphor such as Eu phosphor and (Ba, Mg) Al O: a phosphor such as Eu phosphor
- Aluminate phosphors such as Eu and Mn phosphors are used.
- an oxidized phosphor such as a La OS: Eu phosphor is used.
- nitride-based phosphors for example, AE: Si; N: Eu
- oxynitride-based phosphors for example, Y SiO N: Ce
- Gallon-based phosphor for example, AEx (Si, AI) (N, O): Eu) or the like may be applied.
- the light-emitting device 31 is not limited to a white light-emitting lamp, and may be a light-emitting device 31 having an emission color other than white.
- the light-emitting device 31 emits light other than white light, for example, light of an intermediate color, various phosphors are appropriately used according to the target light-emitting color.
- the phosphor 41 contained in the phosphor layer 42 is a phosphor particle in which the small particles 43 of the phosphor are bonded to each other to form secondary particles, that is, It has secondary body particles 44. Further, the phosphor secondary particles 44 have a particle size in the range of 5 to 10 m. When an RGB phosphor or the like is used as the phosphor 41, the phosphor 41 having phosphor secondary particles 44 having a particle size in the range of 5 to 10 ⁇ m is used for each of the blue, green, and red phosphors. use. The same applies to the case where two or more kinds of phosphors 41 other than the RGB phosphor are used in combination.
- the phosphor secondary particles 44 as shown in Fig. 5 are produced, for example, as follows. That is, when the phosphor raw material is fired to produce the phosphor particles, the firing temperature and the firing time are adjusted to control the crystal growth state of the phosphor particles, thereby forming the phosphor secondary particles 44. Phosphor particles can be obtained. Further, the particle size of the phosphor secondary particles 44 can be controlled by performing a classification process such as sieving in the manufacturing process.
- Such phosphor secondary particles 44 are formed by bonding small phosphor particles 43, 43 during the crystal growth process, they are not easily separated, and the particle size of the secondary particles 44 is small. It shows a luminous efficiency close to that of primary particles having a particle size equivalent to D. Furthermore, since the surface area is larger than the primary particles having the same particle size as the particle size D, the sedimentation speed in the liquid transparent resin is low. Thus, it is possible to suppress the sedimentation of the phosphor 41 in a liquid transparent resin having a resin viscosity in the range of 0.1 to lOPa's, for example, without lowering the luminous efficiency of the phosphor 41 itself. It becomes.
- the particle diameter of the phosphor secondary particles 44 is less than 5 m, a decrease in the luminous efficiency of the phosphor 41 itself is inevitable. On the other hand, if the particle size exceeds 10 m, even the phosphor secondary particles 44 tend to settle in the liquid transparent resin. As described above, by using the phosphor 41 having the phosphor secondary particles 44 having a particle diameter of 5 to 10 m, the liquid viscosity in the range of 0.1 to lOPa's is obtained. Even when a fat is used, it is possible to obtain a phosphor layer 42 in which phosphor particles are dispersed with good reproducibility, while suppressing a decrease in the luminous efficiency of the phosphor 41 itself.
- the light emitting device 31 having excellent luminous efficiency. Further, in the manufacturing process of the phosphor layer 42, for example, the sedimentation of the phosphor particles in the dispenser is suppressed, so that the dispersed phosphor layer 42 can be manufactured efficiently and with high precision. As a result, it is possible to improve the manufacturing yield of the light emitting device 31 and reduce the manufacturing cost.
- the blue light emitted from the light emitting diode element 37 emits blue light passing between the particles of the phosphor 41 and blue light emitted from the phosphor 41.
- White light emission is obtained by mixing with yellow light or orange light that emits light when excited. For this reason, the particle size and shape of the phosphor 41 greatly affect the emission color of the light emitting device 11. If the particle size of the phosphor 41 is large, the gap becomes large. Therefore, a desired color temperature cannot be obtained unless the mixing ratio of the phosphor 41 is increased.
- the phosphor 41 having the phosphor secondary particles 44 by using the phosphor 41 having the phosphor secondary particles 44, the gap between the phosphors 41 is reduced, so that the amount of the phosphor necessary to obtain a target white temperature can be reduced. It becomes possible. Thus, the manufacturing cost of the light emitting device 31 can be reduced.
- the light emitting device 31 having a phosphor having phosphor particles having two or more peaks instead of using the secondary particles 44 will be described. Note that the basic configuration of the light emitting device 31 is the same.
- the phosphor 41 contained in the phosphor layer 42 has phosphor particles having two or more peaks in the particle size distribution.
- a first phosphor particle group mainly comprising the phosphor 41 in the phosphor layer 42 and a second phosphor particle group having an average particle diameter force S smaller than the first phosphor particle group
- the average particle diameter of the first phosphor particle group is preferably, for example, in the range of 5 to 15 m in order to maintain the luminous efficiency of the light emitting device 31 and the like.
- the second phosphor particle group exists between the particles of the first phosphor particle group and improves the dispersion state of the phosphor 41 in the phosphor layer 42. It preferably has an average particle size.
- the emission color and luminous efficiency of the light emitting device 31 can be improved, or the amount of the phosphor 41 used can be improved. Can be reduced.
- a yellow or orange light emitting phosphor is formed by providing a second phosphor particle group between the first phosphor particle groups. The light emission amount of the light emitting device is improved. Therefore, it is possible to reduce the amount of phosphor required to obtain a target white temperature. Further, when the amount of the phosphor is the same, the white temperature and the emission luminance can be increased.
- a lighting device can be configured by combining the light emitting device 31 and a lens.
- a YAG phosphor having a composition of (Y, Gd) (Al, Ga) O: Ce was produced as follows. Each element
- a predetermined amount of element (Y, Gd, Ga, Ce) was weighed, and after dissolving them, they were coprecipitated.
- the coprecipitate was mixed with alumina and alumina as a flux, and then fired in air under the conditions shown in the table of FIG. After pulverizing each of the fired products, they were subjected to washing, separation, and drying treatments, and further classified using a sieve to obtain a target YAG phosphor.
- the average particle size of the YAG phosphor was adjusted by opening the sieve. For example, in Example 1, particles smaller than 5 m and particles larger than 10 ⁇ m were removed by a sieve.
- each of the YAG phosphors thus obtained had secondary particles.
- Each YAG phosphor contained primary particles as a part thereof, but the ratio was shifted by about 20%. That is, the ratio of primary particles to secondary particles (quantity ratio) is 2: 8.
- all of the YAG phosphors of Comparative Examples 13 to 13 remained primary particles.
- the average particle size of each of these YAG phosphors was measured by a force counter method. The results are shown in the table of FIG.
- each YAG phosphor was dispersed in a silicone resin having a resin viscosity of 0.3 Pa's. After each of these silicone resins was filled into the container with a dispenser, the silicone resins were cured to produce light emitting devices.
- YA for silicone resin The amount of the G phosphor added was 10% by mass.
- the luminous efficiency of the phosphor, the applicability of the silicone resin containing the phosphor, and the dispersibility of the phosphor in the silicone resin layer were examined. The measurement results are shown in the table of FIG.
- the luminous efficiency of the phosphor is a relative value when Comparative Example 3 is set to 1.
- the applicability of the silicone resin containing the phosphor is determined when the dispersion of the amount of application under the same application conditions (application pressure and time) is small so that the phosphor does not settle in the dispenser. X settled when X was settled and the variation in the coating amount under the same coating conditions was large.
- the dispersibility of the phosphor in the silicone resin layer was evaluated as ⁇ when the phosphor 41 was uniformly dispersed above the light emitting diode 37 as shown in FIG.
- the phosphor 41 is dispersed throughout the phosphor layer 42 as shown in b)
- the phosphor 41 is dispersed in a range of less than half of the phosphor layer 42 as shown in FIG.
- the phosphor of Example 5 was prepared by mixing a YAG phosphor having a particle size range of 5 to 10 Pm by sieving and a YAG phosphor having a particle diameter of 13 to 13 Pm.
- a phosphor of Example 6 was prepared by mixing a YAG phosphor having a particle size range of 7 to 15 m and a YAG phosphor having a particle diameter of 11 to 13 ⁇ m by sieving.
- YAG phosphors having a particle size range of 5 to 10 m, YAG phosphors of 715 m, and 1 to 7 m were used alone.
- Example 2 The phosphors of the above Examples and Comparative Examples were used in the same manner as in Example 1, respectively. Thus, a light emitting device was manufactured. At this time, a fluorescent body weight (a blending amount of the phosphor with respect to the silicone resin) at which a white temperature of 5000 K was obtained was examined. Furthermore, the luminous efficiency of a light emitting device with a white temperature of 5000K was measured. The results of these measurements are shown in the table in FIG. The luminous efficiency of the phosphor is a relative value when Comparative Example 4 is set to 1.
- FIG. 13 to FIG. 16 show a third embodiment.
- 13 is a cross-sectional view of the light emitting module of the lighting device
- FIG. 14 is a front view of the light emitting module
- FIG. 15 is a front view of the lighting device
- FIG. 16 is an explanatory diagram of a combination example of the materials of the light emitting module.
- reference numeral 51 denotes an illuminating device.
- the illuminating device 51 has an appliance main body 52 formed in a rectangular and thin shape, and a rectangular opening 53 is formed on the surface of the appliance main body 52.
- a plurality of rectangular light emitting modules 54 are arranged in a matrix in the opening 53, and a light emitting surface 55 is formed by the plurality of light emitting modules 54.
- each light-emitting module 54 has a light-emitting diode element (light-emitting diode chip) 61 which is a solid-state light-emitting element as a light-emitting element, and the plurality of light-emitting diode elements 61
- the substrate 62 is formed in a matrix shape on one surface of the substrate 62 formed of a material having high thermal conductivity such as glass epoxy resin, aluminum, and aluminum nitride.
- an insulating layer which is a thermosetting resin or a thermoplastic resin having an elasticity lower than that of the epoxy resin, higher than that of the engineering plastic, and having insulation and heat conductivity as well as insulating properties is provided.
- An adhesive 63 is applied, and a conductive layer 64 of, for example, copper, gold, nickel, or the like is bonded and arranged via a first insulating layer 63a formed of the adhesive 63.
- a circuit pattern 65 is formed by the conductive layer 64, and a light emitting element disposing portion 66 for mounting the light emitting diode element 61 is formed on the circuit pattern 65 in a matrix.
- each light emitting element disposition section 66 one electrode of the light emitting diode element 61 is connected to one electrode pattern of the circuit pattern 65 by die bonding using silver paste as a connection layer 81.
- the other electrode is connected to the other pole pattern of the circuit pattern 65 by a wire 67 by wire bonding.
- a reflector 68 made of a material having high heat resistance and high reflection characteristics such as aluminum nitride is bonded and arranged.
- a plurality of housing portions 69 in which the respective light emitting diode elements 61 are provided in a housed state corresponding to the respective light emitting element mounting portions 66 are formed.
- Each of the housing portions 69 is formed such that the opening diameter A on the lens 76 side, that is, the front side, which is opposite to the substrate 62 side, is larger than the opening diameter B on the substrate 62 side, that is, the back side, from the substrate 62 side to the lens 76 side, that is, the back side.
- the lateral force is expanded toward the front surface side, and a reflecting surface 70 that is inclined toward the inside of the housing portion 69 is formed.
- a reflection film having high light reflectivity such as white oxidized titanium, copper, nickel, or aluminum may be formed.
- the housing 69 is formed with two transparent resin layers 72 and 73 covering the light emitting diode element 61.
- the lower resin layer 72 directly covering the light emitting diode element 61 is made of, for example, silicone resin having elasticity that is strong against ultraviolet light, and a diffusing agent for diffusing visible light and ultraviolet light from the light emitting diode element 61 is dispersed therein. Diffusion layer 74.
- the upper resin layer 61 is made of a silicone resin, an epoxy resin, a modified epoxy resin, or the like, and is a visible light converting material such as a phosphor that converts ultraviolet light from the light emitting diode element 61 into visible light. Is formed as a visible light conversion layer 75 as a phosphor layer in which is settled.
- a lens 76 made of a translucent resin such as fat is provided on the surface side of the reflector 68.
- a thermosetting resin is used for the substrate 62
- the same type of thermosetting resin is used for the material of the lens 76.
- a thermoplastic resin is used for the substrate 62
- the same type of thermoplastic resin is used for the lens 76.
- the lens 76 has a lens portion 77 formed in a lens shape corresponding to each light emitting diode element 61, and each of the lens portions 77 has a concave incident shape in which light is incident opposite the housing portion 69.
- a surface 78 is formed, and a reflecting surface 79 for reflecting light incident on the incident surface 78 and an emitting surface 80 for emitting light incident on the incident surface 78 and light reflected on the reflecting surface 79 are formed.
- the light emitting surface 55 common to the light emitting module 54 is formed by the light emitting surface 80 of the plurality of lens portions 77.
- a base is formed of the substrate 62, the circuit pattern 65, the reflector 68, and the like.
- a light emitting device is formed by combining the light emitting diode element 61 with this base.
- a light emitting module 54 is formed by combining this light emitting device with a lens 76 and the like, and a lighting device 51 is formed by the plurality of light emitting modules 54.
- FIG. 16 shows the substrate 62, the adhesive 63 (the first insulating layer 63a, the second insulating layer 63b, and the third insulating layer 63c), the conductive layer 64, the reflector 68, and the lens 76. Examples 1, 2, 3, and 4 of combinations of material combinations are shown. Combination examples 2, 3, and 4 show only combinations of materials different from combination example 1.
- a similar adhesive 63 which is a thermosetting resin or a thermoplastic resin having an elastic modulus lower than that of the epoxy resin and higher than that of the engineering plastic.
- the adhesive fixation absorbs the difference in thermal expansion, suppresses the occurrence of peeling, and can reliably maintain the adhesive fixation state.
- a conductive layer 64, a light emitting diode element 61, a reflector 68, resin layers 72 and 73, and a lens 76 are disposed on a substrate 62, and the reflector 68 and the lens 76 are each made of the same type of adhesive.
- the heat dissipation from the substrate 62 can be improved, the peeling and warping between the substrate 62 and the reflector 68 and the lens 76 can be suppressed, and the optical characteristics can be maintained. Deterioration of 72, 73, lens 76, etc. can be suppressed and light extraction efficiency can be improved.
- the lens 76 can be attached at the time of manufacturing the substrate, which is efficient.
- the shape of the housing portion 69 is such that the opening diameter on the lens 76 side is A, the opening diameter on the substrate 62 side is B,
- the relationship stipulates that ⁇ tan _1 ⁇ / (AB) ⁇ > 45 °
- the upper resin layer 73 of the two resin layers 72 and 73 covering the light emitting diode element 61 provided in the accommodating section 69 is the visible light conversion layer 75 in which the visible light conversion substance is settled. Therefore, a large amount of light in the visible light region can be easily extracted, and the light extraction efficiency can be increased.
- the visible light converting substance is sedimented, the visible light and ultraviolet light irradiated to the lower resin layer can be efficiently irradiated to the lower resin layer 72, and the thickness of the upper resin layer 73 can be optionally set. Can be set to
- the light emitting diode element 61 can also uniformly irradiate the emitted light to the boundary surface with the upper visible light conversion layer 75. .
- the wire 67 is located at the boundary between the two resin layers 72 and 73, it causes color unevenness.
- the height position of the wire 67 also determines the height of the light-emitting diode element 61, the strength of the wire 67, the workability, and the like. Therefore, if the height of the light emitting diode element 61 is about 75 m and the bottom surface force of the housing part 69 is 200 m in height up to the highest position of the wire 67, the thickness of the lower resin layer 72 is set to 250 / It is preferable that the thickness of the upper resin layer 73 be 750 m.
- the lower layer Preferably, the thickness of the resin layer 72 is 475 ⁇ m, and the thickness of the upper resin layer 73 is 525 ⁇ m. Therefore, the depth of the storage section 69 is optimally 800 to 1200 ⁇ m, and more preferably 1000 ⁇ m.
- inorganic nanoparticles as fillers of 10 to 9 m or less are dispersed in the lower resin layer 72.
- nanoparticles nano-silica with a narrow viscosity distribution of 50 nm or less is used.
- the weight component is 0.1% to 60%, and the visible light transmittance is 50% to 90%.
- the heat transfer coefficient to the substrate 62, the reflector 68, the lens 76, and the like can be improved, and the heat dissipation can be improved.
- the present invention is used for fixed lighting for indoors and outdoors, mobile lighting for vehicles, and the like.
Abstract
Description
Claims
Priority Applications (3)
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EP05727174.4A EP1737050A4 (en) | 2004-03-24 | 2005-03-23 | LIGHT SOURCE AND LIGHTING DEVICE |
JP2006511302A JP5083503B2 (ja) | 2004-03-24 | 2005-03-23 | 発光装置および照明装置 |
US10/599,296 US20080191620A1 (en) | 2004-03-24 | 2005-03-23 | Light Emitting Device and Illuminating Device |
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JP2004-086667 | 2004-03-24 | ||
JP2004086667 | 2004-03-24 | ||
JP2004248203 | 2004-08-27 | ||
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JP2005-020984 | 2005-01-28 | ||
JP2005020984 | 2005-01-28 |
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EP (1) | EP1737050A4 (ja) |
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- 2005-03-23 JP JP2006511302A patent/JP5083503B2/ja not_active Expired - Fee Related
- 2005-03-23 EP EP05727174.4A patent/EP1737050A4/en not_active Withdrawn
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Also Published As
Publication number | Publication date |
---|---|
US20080191620A1 (en) | 2008-08-14 |
TWI286393B (en) | 2007-09-01 |
JPWO2005091387A1 (ja) | 2008-02-07 |
JP5083503B2 (ja) | 2012-11-28 |
TW200536157A (en) | 2005-11-01 |
EP1737050A1 (en) | 2006-12-27 |
EP1737050A4 (en) | 2014-03-12 |
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