WO2017110031A1 - 発光素子および照明装置 - Google Patents
発光素子および照明装置 Download PDFInfo
- Publication number
- WO2017110031A1 WO2017110031A1 PCT/JP2016/004853 JP2016004853W WO2017110031A1 WO 2017110031 A1 WO2017110031 A1 WO 2017110031A1 JP 2016004853 W JP2016004853 W JP 2016004853W WO 2017110031 A1 WO2017110031 A1 WO 2017110031A1
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- WIPO (PCT)
- Prior art keywords
- layer
- phosphor
- substrate
- light
- emitting element
- Prior art date
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- 238000005286 illumination Methods 0.000 title description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 139
- 239000000758 substrate Substances 0.000 claims abstract description 75
- 239000010410 layer Substances 0.000 claims description 240
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 18
- 230000005284 excitation Effects 0.000 claims description 14
- 238000009792 diffusion process Methods 0.000 claims description 12
- 230000003746 surface roughness Effects 0.000 claims description 6
- 229910044991 metal oxide Inorganic materials 0.000 claims description 5
- 150000004706 metal oxides Chemical class 0.000 claims description 5
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 claims description 3
- 239000012790 adhesive layer Substances 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 32
- 230000004048 modification Effects 0.000 description 36
- 238000012986 modification Methods 0.000 description 36
- 239000000463 material Substances 0.000 description 14
- 239000007769 metal material Substances 0.000 description 12
- 229910000679 solder Inorganic materials 0.000 description 7
- 230000017525 heat dissipation Effects 0.000 description 6
- 239000011521 glass Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000007747 plating Methods 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 238000004544 sputter deposition Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- -1 ITO Chemical class 0.000 description 1
- 206010037660 Pyrexia Diseases 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
- F21K9/64—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
- G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
- F21V13/12—Combinations of only three kinds of elements
- F21V13/14—Combinations of only three kinds of elements the elements being filters or photoluminescent elements, reflectors and refractors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
- F21V9/32—Elements containing photoluminescent material distinct from or spaced from the light source characterised by the arrangement of the photoluminescent material
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0284—Diffusing elements; Afocal elements characterized by the use used in reflection
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/08—Mirrors
- G02B5/0808—Mirrors having a single reflecting layer
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—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
- H05B33/145—Arrangements of the electroluminescent material
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/22—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
- H05B33/24—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers of metallic reflective layers
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/26—Light sources with substantially two-dimensional radiating surfaces characterised by the composition or arrangement of the conductive material used as an electrode
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
Definitions
- the present invention relates to a light emitting element in which a phosphor layer is laminated on a substrate and an illumination device including the light emitting element.
- a phosphor layer is irradiated with a laser beam transmitted by a light guide member as excitation light to a light emitting element in which a phosphor layer is laminated on a substrate, so that the phosphor layer emits light and is converted into a desired light color.
- a light guide member as excitation light
- a light emitting element in which a phosphor layer is laminated on a substrate
- the phosphor layer emits light and is converted into a desired light color.
- an illuminating device that illuminates (see Patent Document 1, for example).
- an object of the present invention is to increase the heat radiation efficiency in the light emitting element.
- a light-emitting element includes a phosphor layer including at least one kind of phosphor and a substrate having higher thermal conductivity than the phosphor layer, and the phosphor layer is disposed on one main surface side. And a bonding portion for metal bonding between the phosphor layer and the substrate interposed between the phosphor layer and the substrate, and the phosphor layer between the bonding portion and the phosphor layer.
- a translucent adhesion layer laminated on the main surface on the substrate side in the substrate and a reflective layer laminated on the main surface on the substrate side in the adhesion layer are interposed.
- the heat dissipation efficiency of the light emitting element can be increased.
- FIG. 1 is a schematic diagram illustrating a schematic configuration of a lighting apparatus according to an embodiment.
- FIG. 2 is a cross-sectional view illustrating a schematic configuration of the light-emitting element according to the embodiment.
- FIG. 3 is a cross-sectional view illustrating a state before assembly of the light-emitting element according to the embodiment.
- FIG. 4 is a cross-sectional view illustrating a schematic configuration of a light emitting device according to Modification 1.
- FIG. 5 is a cross-sectional view illustrating a schematic configuration of a light-emitting element according to Modification 2.
- FIG. 6 is a cross-sectional view illustrating a schematic configuration of a light emitting device according to Modification 3.
- FIG. 1 is a schematic diagram illustrating a schematic configuration of a lighting apparatus according to an embodiment.
- FIG. 2 is a cross-sectional view illustrating a schematic configuration of the light-emitting element according to the embodiment.
- FIG. 3 is a cross-sectional
- FIG. 7 is a cross-sectional view illustrating a schematic configuration of a light-emitting element according to Modification 4.
- FIG. 8 is a cross-sectional view illustrating a schematic configuration of a light-emitting element according to Modification 5.
- FIG. 9 is a cross-sectional view illustrating a schematic configuration of a light-emitting element according to Modification 6.
- FIG. 1 is a schematic diagram illustrating a schematic configuration of a lighting apparatus according to an embodiment.
- the lighting device 1 includes a light source unit 2, a light guide member 3, and a light emitting element 4.
- the light source unit 2 is a device that generates laser light and supplies the laser light to the light emitting element 4 via a light guide member 3 such as an optical fiber.
- the light source unit 2 is a semiconductor laser element that emits laser light having a wavelength of bluish purple to blue (430 to 490 nm).
- the light emitting element 4 is a light emitting element that emits white light to the surface side using the laser light transmitted from the light guide member 3 and irradiated from the surface side as excitation light.
- FIG. 2 is a cross-sectional view showing a schematic configuration of the light-emitting element 4 according to the embodiment.
- the light-emitting element 4 includes a substrate 41, a bonding portion 42, a reflective layer 43, an adhesion layer 44, and a phosphor layer 45.
- the substrate 41 is a substrate whose planar view shape is, for example, a rectangular shape or a circular shape.
- the substrate 41 is a substrate having higher thermal conductivity than the phosphor layer 45. Thereby, the heat conducted from the phosphor layer 45 can be efficiently radiated from the substrate 41.
- the substrate 41 is made of a metal material such as Cu or Al.
- the substrate 41 may be made of a material other than a metal material as long as it has a higher thermal conductivity than the phosphor layer 45. Examples of the material other than the metal material include glass and sapphire.
- a heat sink such as a mirror surface heat sink may be in contact with and attached to the substrate 41 in order to further improve heat dissipation.
- the phosphor layer 45 is disposed on one main surface 411 side of the substrate 41 with the joint portion 42, the reflective layer 43, and the adhesion layer 44 interposed therebetween.
- the phosphor layer 45 is formed in the same shape as the substrate 41 in plan view.
- the phosphor layer 45 includes, for example, phosphor particles (phosphor particles 451) that are excited by laser light to emit fluorescence in a dispersed state, and the phosphor particles 451 emit fluorescence when irradiated with laser light. . For this reason, the outer main surface of the phosphor layer 45 becomes a light emitting surface.
- the phosphor layer 45 emits white light, and a first phosphor that emits red light when irradiated with laser light, a second phosphor that emits blue light, and a third phosphor that emits green light.
- a first phosphor that emits red light when irradiated with laser light a second phosphor that emits blue light
- a third phosphor that emits green light a third phosphor that emits green light.
- Three types of phosphor particles of the phosphor are included at an appropriate ratio.
- the type and characteristics of the phosphor are not particularly limited. However, since a relatively high output laser beam serves as excitation light, it is desirable that the phosphor has high heat resistance.
- the type of the substrate that holds the phosphor in a dispersed state is not particularly limited, but the substrate should be highly transparent with respect to the wavelength of the excitation light and the wavelength of the light emitted from the phosphor. desirable.
- the base material which consists of glass or ceramics is mentioned.
- the phosphor layer 45 may be a polycrystal or a single crystal made of one kind of phosphor.
- the adhesion layer 44 is laminated on the main surface 452 of the phosphor layer 45 on the substrate 41 side.
- the adhesion layer 44 is formed from a light-transmitting compound and is in close contact with the phosphor layer 45 and the reflection layer 43.
- the adhesion layer 44 is formed by depositing a compound on the main surface 452 of the phosphor layer 45 by a known film forming method such as sputtering or plating.
- examples of the compound forming the adhesion layer 44 include oxides, halides, nitrides, and fluorides.
- the oxide include metal oxides such as ITO, IZO, and Al 2 O 3 .
- the reflective layer 43 is laminated on the main surface 441 of the adhesion layer 44 on the substrate 41 side.
- the reflection layer 43 reflects the laser light and the light emitted from the phosphor particles 451.
- the reflective layer 43 is formed of a material having a high reflectance with respect to the laser light and the light emitted from the phosphor particles 451.
- the material having high reflectivity is a metal material such as Ag or Al.
- the reflective layer 43 is formed by forming a metal material on the main surface 441 of the adhesion layer 44 by a known film forming method such as sputtering or plating. Further, for example, an increased reflection film such as a dielectric multilayer film may be formed on the layer formed of these metal materials.
- the bonding portion 42 includes a first electrode layer 421, a second electrode layer 422, and a metal bonding layer 423.
- the first electrode layer 421 is laminated on the main surface 411 of the substrate 41 on the phosphor layer 45 side.
- the first electrode layer 421 is made of a metal material such as Au, Ag, Ni, Pd, Ti, for example.
- the first electrode layer 421 is formed by forming a metal material on the main surface 411 of the substrate 41 by a known film forming method such as sputtering or plating.
- the second electrode layer 422 is laminated on the main surface 431 of the reflective layer 43 on the substrate 41 side.
- the second electrode layer 422 is made of a metal material such as Au, Ag, Ni, Pd, Ti, for example.
- the second electrode layer 422 is formed by forming a metal material on the main surface 431 of the reflective layer 43 by a film forming method such as sputtering or plating.
- the metal bonding layer 423 is laminated on the main surface 4211 on the phosphor layer 45 side in the first electrode layer 421 and the main surface 4221 on the substrate 41 side in the second electrode layer 422.
- the metal bonding layer 423 is formed of a metal material capable of metal bonding. Examples of metal materials that can be metal-bonded include AuSn-based, AuGe-based, and SnAgCu-based solder materials.
- FIG. 3 is a cross-sectional view showing a state before assembly of the light-emitting element 4 according to the embodiment.
- the first electrode layer 421 is integrated with the substrate 41 in advance, and the adhesion layer 44, the reflective layer 43, the first layer with respect to the phosphor layer 45.
- the two-electrode layer 422 and the solder material 423a are integrated in advance.
- the solder material 423a is melted by heating, and the first electrode layer 421 and the second electrode layer 422 are metal-bonded.
- the solder material is interposed between the first electrode layer 421 and the second electrode layer 422, thereby forming the metal bonding layer 423 that bonds the first electrode layer 421 and the second electrode layer 422.
- solder material 423a may be integrated with the second electrode layer 422 in advance before the light-emitting element 4 is assembled. Further, the solder material 423a may be a separate body from the first electrode layer 421 and the second electrode layer 422, and may be attached to the first electrode layer 421 and the second electrode layer 422 at the time of assembly.
- the phosphor particles 451 generate heat, but the heat is transferred to the substrate through the adhesion layer 44, the reflective layer 43, the second electrode layer 422, the metal bonding layer 423, and the first electrode layer 421. Heat is transmitted to 41.
- the illumination device 1 includes the light emitting element 4 and the light source unit 2 that emits excitation light for exciting the phosphor particles 451 of the light emitting element 4.
- the light emitting element 4 has a phosphor layer 45 including at least one kind of phosphor particles 451 and a higher thermal conductivity than the phosphor layer 45, and the phosphor layer 45 is disposed on one main surface 411 side.
- a substrate 41 and a bonding portion 42 interposed between the phosphor layer 45 and the substrate 41 for metal bonding of the phosphor layer 45 and the substrate 41 are provided.
- the resin becomes a thermal barrier and the heat dissipation efficiency is lowered.
- the substrate 41 having a higher thermal conductivity than the phosphor layer 45 and the phosphor layer 45 are metal-bonded by the joint portion 42, the phosphor layer 45 smoothly transfers to the substrate 41. It can heat and can improve heat dissipation efficiency.
- the reflection layer 43 is laminated
- a minute gap may be formed between the reflective layer 43 and the phosphor layer 45. If there is such a minute gap, the heat transfer from the phosphor layer 45 to the substrate 41 is weakened. However, since the phosphor layer 45 and the reflective layer 43 are in close contact with the adhesive layer 44, it is possible to suppress a decrease in heat transfer due to the gap. Therefore, heat dissipation efficiency can be increased.
- each of the first electrode layer 421, the adhesion layer 44, the reflective layer 43, the second electrode layer 422, and the metal bonding layer 423 has a higher thermal conductivity than the phosphor layer 45. May be formed.
- the bonding portion 42 includes a first electrode layer 421 stacked on the main surface 411 of the substrate 41, a second electrode layer 422 stacked on the main surface 431 of the reflective layer 43 on the substrate 41 side, and a first electrode layer. And a metal bonding layer 423 that is interposed between the first electrode layer 421 and the second electrode layer 422 and is interposed between the first electrode layer 422 and the second electrode layer 422.
- the metal bonding layer 423 is sandwiched between the first electrode layer 421 and the second electrode layer 422, by applying a current to the first electrode layer 421 and the second electrode layer 422 at the time of manufacture, Metal bonding by the metal bonding layer 423 can be easily realized.
- the adhesion layer 44 is formed of a metal oxide.
- the adhesion layer 44 is formed of a metal oxide, the adhesion to both the phosphor layer 45 and the reflection layer 43 can be enhanced.
- FIG. 4 is a cross-sectional view showing a schematic configuration of a light emitting element 4A according to Modification 1, and specifically corresponds to FIG.
- the same parts as those of the light-emitting element 4 according to the embodiment are denoted by the same reference numerals, the description thereof is omitted, and only different parts are described.
- the case where the phosphor particles 451 are dispersed almost uniformly throughout the phosphor layer 45 has been described as an example.
- the light emitting element 4A in which the phosphor particles 451 are arranged on the substrate 41 side in the phosphor layer 45a will be described.
- the phosphor layer 45a has a two-layer structure.
- a second layer 454 is formed by stacking 455. The second layer 454 is disposed on the substrate 41 side, and the first layer 453 is disposed on the side opposite to the substrate 41, whereby the phosphor particles 451 are disposed on the substrate 41 side in the phosphor layer 45a.
- the phosphor particles 451 are arranged so as to be biased toward the substrate 41 in the phosphor layer 45a, the interval between any of the phosphor particles 451 and the substrate 41 can be reduced. For this reason, heat can be efficiently transferred to the substrate 41 side.
- the second layer 454 containing the phosphor particles 451 can be protected by the first layer 453.
- the phosphor particles are aggregated on one main surface side of the phosphor layer so that the main surface is on the substrate 41 side. You may arrange.
- FIG. 5 is a cross-sectional view showing a schematic configuration of a light-emitting element 4B according to Modification Example 2, and specifically corresponds to FIG.
- the bonding portion 42 includes the first electrode layer 421, the second electrode layer 422, and the metal bonding layer 423 has been described as an example.
- a light-emitting element 4B in which the joint portion 42b is formed from sintered silver nanoparticles will be described.
- the joint portion 42 b is interposed between the adhesion layer 44 and the substrate 41.
- the bonding portion 42b is formed by sintering silver nanoparticles, metal bonding can be performed without the first electrode layer 421 and the second electrode layer 422.
- the reflectance is raised by sintering silver nanoparticle, it can function also as a reflection layer. That is, the reflective layer 43 in the light emitting element 4 according to the embodiment can be omitted, so that the manufacturing efficiency can be increased.
- FIG. 6 is a cross-sectional view showing a schematic configuration of a light emitting element 4C according to Modification 3, and specifically corresponds to FIG.
- the through-hole 5 continuous in the normal direction of the main surface 411 of the substrate 41 is formed in the substrate 41, the bonding portion 42, the reflective layer 43, and the adhesion layer 44. Is formed.
- the through-hole 5 can be used as an optical path of excitation light (laser light) incident from the substrate 41 side. Thereby, white light can be emitted in the traveling direction of the excitation light.
- the light source part 2 and the light guide member 3 can be arrange
- the through-hole 5 is continuous in the normal direction of the main surface 411 of the substrate 41 in the third modification.
- the through-hole 5 is formed in any direction as long as the direction intersects the main surface 411. May be continuous.
- FIG. 7 is a cross-sectional view showing a schematic configuration of a light-emitting element 4D according to Modification Example 4, and specifically corresponds to FIG.
- the light emitting element 4D according to the modification 4 is different from the light emitting element 4 according to the above embodiment in that the light emitting element 4D includes the diffusion layer 46.
- a diffusion layer 46 that diffuses light is interposed between the phosphor layer 45 and the adhesion layer 44 in the light emitting element 4 ⁇ / b> D.
- the diffusion layer 46 diffuses the laser light that is excitation light and the fluorescence emitted by the phosphor particles 451.
- the diffusion layer 46 is formed, for example, by dispersing diffusion particles such as silica-based particles or titanium-based particles in an inorganic sealing material such as glass.
- the diffusion layer 46 is interposed between the phosphor layer 45 and the reflection layer 43, the laser light and the fluorescence can be diffused by the diffusion layer 46 and mixed. Therefore, uniform white light can be realized.
- the diffusion layer 46 is interposed between the phosphor layer 45 and the adhesion layer 44 has been described as an example.
- the diffusion layer 46 only needs to be interposed between the phosphor layer 45 and the reflection layer 43. That is, the diffusion layer 46 may be interposed between the adhesion layer 44 and the reflection layer 43.
- FIG. 8 is a cross-sectional view showing a schematic configuration of a light-emitting element 4E according to Modification Example 5, and specifically corresponds to FIG.
- the light emitting element 4E according to the modified example 5 is different from the light emitting element 4 according to the above-described embodiment in that the surface of the phosphor layer 45e has an uneven pattern 455. Specifically, as shown in FIG. 8, an uneven pattern in which fine unevenness 454 is repeated in a region R1 irradiated with laser light on a surface 453 of the phosphor layer 45e opposite to the substrate 41. 455 is formed.
- the concavo-convex pattern 455 is formed by, for example, nanoimprint technology or blasting.
- the surface roughness due to the uneven pattern 455 may be a surface roughness equal to or greater than the wavelength of the laser beam.
- the uneven pattern 455 is formed only in the region R1 in the surface 453 of the phosphor layer 45e is illustrated, but the uneven pattern 455 only needs to be formed in at least the region R1. . That is, the uneven pattern 455 may be formed on the entire surface 453 of the phosphor layer 45e.
- FIG. 9 is a cross-sectional view showing a schematic configuration of a light-emitting element 4F according to Modification Example 6, and specifically corresponds to FIG.
- the light emitting element 4F according to the modified example 6 is different from the light emitting element 4 according to the above-described embodiment in that the main surface 452f of the phosphor layer 45f has an uneven pattern 459.
- a concavo-convex pattern 459 in which fine concavo-convex 458 is repeated is provided in a region R2 irradiated with laser light. Is formed.
- the uneven pattern 459 is formed by, for example, nanoimprint technology or blasting.
- the surface roughness due to the uneven pattern 459 may be a surface roughness equal to or greater than the wavelength of the laser beam.
- the concave / convex pattern 459 is formed only in the region R2 of the main surface 452f of the phosphor layer 45f is illustrated, but the concave / convex pattern 459 is at least formed in the region R2. Good. That is, the uneven pattern 459 may be formed on the entire main surface 452f of the phosphor layer 45f.
- the light emitting element 4 is applied to the lighting device 1 as an example, but the light emitting element 4 can also be used for other illumination systems.
- Examples of other illumination systems include a projector and an in-vehicle headlight.
- the light emitting element 4 is used as a phosphor wheel.
- a reflection suppressing layer such as an AR coating layer may be laminated on the surface of the phosphor layer 45 opposite to the main surface 452, that is, the light emitting surface. Thereby, the light extraction efficiency can be increased.
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- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
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- Non-Portable Lighting Devices Or Systems Thereof (AREA)
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Abstract
Description
まず、実施の形態に係る照明装置について説明する。
以下、発光素子4について詳細に説明する。
次に、照明装置1の動作について説明する。
以上のように、本実施の形態によれば、照明装置1は、発光素子4と、発光素子4の蛍光体粒子451を励起するための励起光を照射する光源部2とを備えている。そして、発光素子4は、少なくとも一種類の蛍光体粒子451を含む蛍光体層45と、蛍光体層45よりも熱伝導率が高く、蛍光体層45が1つの主面411側に配置された基板41と、蛍光体層45と基板41との間に介在して蛍光体層45と基板41とを金属接合するための接合部42とを備えている。接合部42と蛍光体層45との間には、蛍光体層45における基板41側の主面452に積層された透光性の密着層44と、密着層44における基板41側の主面441に積層された反射層43とが介在している。
次に、本実施の形態に係る変形例1について説明する。
次に、本実施の形態に係る変形例2について説明する。
次に、本実施の形態に係る変形例3について説明する。
次に、本実施の形態に係る変形例4について説明する。
次に、本実施の形態に係る変形例5について説明する。
次に、本実施の形態に係る変形例6について説明する。
以上、本発明に係る照明装置について、上記実施の形態および変形例1~6に基づいて説明したが、本発明は、上記の実施の形態および変形例1~6に限定されるものではない。
2 光源部
4,4A,4B,4C 発光素子
5 貫通孔
41 基板
42,42b 接合部
43 反射層
44 密着層
45,45a 蛍光体層
46 拡散層
411,441 主面
421 第1電極層
422 第2電極層
423 金属接合層
451 蛍光体粒子(蛍光体)
452,452e 主面
453e 表面
Claims (10)
- 少なくとも一種類の蛍光体を含む蛍光体層と、
前記蛍光体層よりも熱伝導率の高い基板であって、前記蛍光体層が1つの主面側に配置された基板と、
前記蛍光体層と前記基板との間に介在して前記蛍光体層と前記基板とを金属接合するための接合部とを備え、
前記接合部と前記蛍光体層との間には、
前記蛍光体層における前記基板側の主面に積層された透光性の密着層と、
前記密着層における前記基板側の主面に積層された反射層と、が介在している
発光素子。 - 前記接合部は、
前記基板における前記主面に積層された第1電極層と、
前記反射層における前記基板側の主面に積層された第2電極層と、
前記第1電極層と前記第2電極層との間に介在され、前記第1電極層と前記第2電極層とを接合する金属接合層と、を有する
請求項1に記載の発光素子。 - 前記接合部は、焼結された銀ナノ粒子からなる
請求項1に記載の発光素子。 - 前記蛍光体は、前記蛍光体層における前記基板側に配置されている
請求項1~3のいずれか一項に記載の発光素子。 - 前記密着層は、金属酸化物から形成されている
請求項1~4のいずれか一項に記載の発光素子。 - 前記基板と、前記接合部と、前記反射層と、前記密着層とには、前記基板の前記主面に交差する方向に連続する貫通孔が形成されており、
前記貫通孔は、前記蛍光体を励起させるため、前記基板側から入射する励起光の光路となる
請求項1~5のいずれか一項に記載の発光素子。 - 前記蛍光体層と前記反射層との間には、光を拡散する拡散層が介在している
請求項1~6のいずれか一項に記載の発光素子。 - 前記蛍光体層における前記基板とは反対側の表面のうち、前記蛍光体を励起させるための励起光が照射される領域は、当該励起光の波長以上の表面粗さを有する
請求項1~7のいずれか一項に記載の発光素子。 - 前記蛍光体層における前記基板側の前記主面のうち、前記蛍光体を励起させるための励起光が照射される領域は、当該励起光の波長以上の表面粗さを有する
請求項1~7のいずれか一項に記載の発光素子。 - 請求項1~9のいずれか一項に記載の発光素子と、
前記発光素子の前記蛍光体を励起するための励起光を照射する光源部と、を備える
照明装置。
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EP16877936.1A EP3396232B1 (en) | 2015-12-24 | 2016-11-10 | Light-emitting element and illumination device |
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WO2019159441A1 (ja) | 2018-02-14 | 2019-08-22 | 日本特殊陶業株式会社 | 光波長変換装置 |
WO2020044426A1 (ja) * | 2018-08-28 | 2020-03-05 | 日本碍子株式会社 | 蛍光体素子および照明装置 |
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CN113970872A (zh) * | 2020-07-24 | 2022-01-25 | 中强光电股份有限公司 | 波长转换元件及投影机 |
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US20230038009A1 (en) * | 2020-03-18 | 2023-02-09 | Sharp Kabushiki Kaisha | Wavelength conversion element and optical device |
CN114967302A (zh) * | 2021-02-22 | 2022-08-30 | 中强光电股份有限公司 | 波长转换模块及投影机 |
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JP6493713B2 (ja) | 2019-04-03 |
JPWO2017110031A1 (ja) | 2018-06-21 |
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