WO2022176597A1 - 波長変換体及びそれを用いた発光装置 - Google Patents
波長変換体及びそれを用いた発光装置 Download PDFInfo
- Publication number
- WO2022176597A1 WO2022176597A1 PCT/JP2022/003779 JP2022003779W WO2022176597A1 WO 2022176597 A1 WO2022176597 A1 WO 2022176597A1 JP 2022003779 W JP2022003779 W JP 2022003779W WO 2022176597 A1 WO2022176597 A1 WO 2022176597A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- phosphor
- light
- wavelength converter
- wavelength
- emitting device
- Prior art date
Links
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 401
- 239000000919 ceramic Substances 0.000 claims abstract description 102
- 230000007704 transition Effects 0.000 claims abstract description 36
- 238000006243 chemical reaction Methods 0.000 claims description 51
- 239000007787 solid Substances 0.000 abstract description 2
- 239000011651 chromium Substances 0.000 description 32
- 230000005284 excitation Effects 0.000 description 26
- 239000000758 substrate Substances 0.000 description 25
- 238000007689 inspection Methods 0.000 description 19
- 239000000463 material Substances 0.000 description 19
- 230000000052 comparative effect Effects 0.000 description 14
- 238000009826 distribution Methods 0.000 description 14
- 239000002994 raw material Substances 0.000 description 13
- 239000002223 garnet Substances 0.000 description 12
- 229920002050 silicone resin Polymers 0.000 description 12
- 229910019655 synthetic inorganic crystalline material Inorganic materials 0.000 description 12
- 229910000323 aluminium silicate Inorganic materials 0.000 description 10
- 239000000843 powder Substances 0.000 description 10
- 239000012190 activator Substances 0.000 description 9
- 238000004458 analytical method Methods 0.000 description 9
- 239000011159 matrix material Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 239000003566 sealing material Substances 0.000 description 9
- OTEWWRBKGONZBW-UHFFFAOYSA-N 2-[[2-[[2-[(2-azaniumylacetyl)amino]-4-methylpentanoyl]amino]acetyl]amino]acetate Chemical compound NCC(=O)NC(CC(C)C)C(=O)NCC(=O)NCC(O)=O OTEWWRBKGONZBW-UHFFFAOYSA-N 0.000 description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 8
- 238000001514 detection method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 108010054666 glycyl-leucyl-glycyl-glycine Proteins 0.000 description 8
- 239000002245 particle Substances 0.000 description 8
- 230000003595 spectral effect Effects 0.000 description 8
- 238000010304 firing Methods 0.000 description 7
- -1 halosilicates Chemical class 0.000 description 7
- 229910010272 inorganic material Inorganic materials 0.000 description 7
- 239000011147 inorganic material Substances 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 7
- 150000004767 nitrides Chemical class 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 7
- 238000010791 quenching Methods 0.000 description 7
- 230000000171 quenching effect Effects 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 6
- 238000000605 extraction Methods 0.000 description 6
- 150000002500 ions Chemical group 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 241001465754 Metazoa Species 0.000 description 5
- 238000011049 filling Methods 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 5
- 230000001678 irradiating effect Effects 0.000 description 5
- 229910052746 lanthanum Inorganic materials 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 4
- 150000001342 alkaline earth metals Chemical class 0.000 description 4
- 210000004027 cell Anatomy 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 230000004907 flux Effects 0.000 description 4
- 230000036541 health Effects 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 4
- 229910001387 inorganic aluminate Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- 150000004760 silicates Chemical class 0.000 description 4
- 229910052688 Gadolinium Inorganic materials 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 230000003796 beauty Effects 0.000 description 3
- 229910019990 cerium-doped yttrium aluminum garnet Inorganic materials 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- 235000013305 food Nutrition 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 244000144972 livestock Species 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 108090000623 proteins and genes Proteins 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- MCSXGCZMEPXKIW-UHFFFAOYSA-N 3-hydroxy-4-[(4-methyl-2-nitrophenyl)diazenyl]-N-(3-nitrophenyl)naphthalene-2-carboxamide Chemical compound Cc1ccc(N=Nc2c(O)c(cc3ccccc23)C(=O)Nc2cccc(c2)[N+]([O-])=O)c(c1)[N+]([O-])=O MCSXGCZMEPXKIW-UHFFFAOYSA-N 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 2
- XUMBMVFBXHLACL-UHFFFAOYSA-N Melanin Chemical compound O=C1C(=O)C(C2=CNC3=C(C(C(=O)C4=C32)=O)C)=C2C4=CNC2=C1C XUMBMVFBXHLACL-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 150000004645 aluminates Chemical class 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 235000013361 beverage Nutrition 0.000 description 2
- 239000012472 biological sample Substances 0.000 description 2
- 150000001642 boronic acid derivatives Chemical class 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 150000004820 halides Chemical class 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 235000021317 phosphate Nutrition 0.000 description 2
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 229910052594 sapphire Inorganic materials 0.000 description 2
- 239000010980 sapphire Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 150000004763 sulfides Chemical class 0.000 description 2
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000012856 weighed raw material Substances 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 201000004384 Alopecia Diseases 0.000 description 1
- 241000271566 Aves Species 0.000 description 1
- 241000272201 Columbiformes Species 0.000 description 1
- 241000238424 Crustacea Species 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- 241000238631 Hexapoda Species 0.000 description 1
- 241000282412 Homo Species 0.000 description 1
- 241000237852 Mollusca Species 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 231100000360 alopecia Toxicity 0.000 description 1
- JNDMLEXHDPKVFC-UHFFFAOYSA-N aluminum;oxygen(2-);yttrium(3+) Chemical class [O-2].[O-2].[O-2].[Al+3].[Y+3] JNDMLEXHDPKVFC-UHFFFAOYSA-N 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 210000004204 blood vessel Anatomy 0.000 description 1
- 210000001124 body fluid Anatomy 0.000 description 1
- 239000010839 body fluid Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- 238000000701 chemical imaging Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 210000000349 chromosome Anatomy 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 235000013365 dairy product Nutrition 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 1
- AJNVQOSZGJRYEI-UHFFFAOYSA-N digallium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Ga+3].[Ga+3] AJNVQOSZGJRYEI-UHFFFAOYSA-N 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000000695 excitation spectrum Methods 0.000 description 1
- 230000029142 excretion Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 210000003608 fece Anatomy 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000799 fluorescence microscopy Methods 0.000 description 1
- 238000002189 fluorescence spectrum Methods 0.000 description 1
- 235000012055 fruits and vegetables Nutrition 0.000 description 1
- CMIHHWBVHJVIGI-UHFFFAOYSA-N gadolinium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[Gd+3].[Gd+3] CMIHHWBVHJVIGI-UHFFFAOYSA-N 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- CMGJQFHWVMDJKK-UHFFFAOYSA-N lanthanum;trihydrate Chemical compound O.O.O.[La] CMGJQFHWVMDJKK-UHFFFAOYSA-N 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000010801 machine learning Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 235000013622 meat product Nutrition 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 102000039446 nucleic acids Human genes 0.000 description 1
- 108020004707 nucleic acids Proteins 0.000 description 1
- 150000007523 nucleic acids Chemical class 0.000 description 1
- 230000000474 nursing effect Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000001579 optical reflectometry Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000003239 periodontal effect Effects 0.000 description 1
- 238000002428 photodynamic therapy Methods 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 235000015170 shellfish Nutrition 0.000 description 1
- 208000017520 skin disease Diseases 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 230000001225 therapeutic effect Effects 0.000 description 1
- 230000005676 thermoelectric effect Effects 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 229910001428 transition metal ion Inorganic materials 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers 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 having potential barriers 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
- H01L33/504—Elements with two or more wavelength conversion materials
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B18/00—Layered products essentially comprising ceramics, e.g. refractory products
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/50—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on rare-earth compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
- C09K11/7767—Chalcogenides
- C09K11/7769—Oxides
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
- C09K11/7774—Aluminates
-
- 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
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
-
- 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
- F21V9/38—Combination of two or more photoluminescent elements of different materials
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers 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 having potential barriers 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
- C04B2235/3225—Yttrium oxide or oxide-forming salts thereof
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3241—Chromium oxides, chromates, or oxide-forming salts thereof
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3286—Gallium oxides, gallates, indium oxides, indates, thallium oxides, thallates or oxide forming salts thereof, e.g. zinc gallate
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6562—Heating rate
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6565—Cooling rate
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/76—Crystal structural characteristics, e.g. symmetry
- C04B2235/762—Cubic symmetry, e.g. beta-SiC
- C04B2235/764—Garnet structure A3B2(CO4)3
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/30—Composition of layers of ceramic laminates or of ceramic or metallic articles to be joined by heating, e.g. Si substrates
- C04B2237/32—Ceramic
- C04B2237/34—Oxidic
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/30—Composition of layers of ceramic laminates or of ceramic or metallic articles to be joined by heating, e.g. Si substrates
- C04B2237/32—Ceramic
- C04B2237/34—Oxidic
- C04B2237/343—Alumina or aluminates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
- C04B2237/62—Forming laminates or joined articles comprising holes, channels or other types of openings
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
- C04B2237/70—Forming laminates or joined articles comprising layers of a specific, unusual thickness
- C04B2237/704—Forming laminates or joined articles comprising layers of a specific, unusual thickness of one or more of the ceramic layers or articles
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
- C04B2237/84—Joining of a first substrate with a second substrate at least partially inside the first substrate, where the bonding area is at the inside of the first substrate, e.g. one tube inside another tube
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/30—Semiconductor lasers
Definitions
- the present invention relates to a wavelength converter and a light emitting device using the same.
- a light-emitting device that combines a solid-state light source that emits primary light such as laser light and a wavelength converter that contains a phosphor.
- a light emitting device for example, a laser illumination device and a laser projector are known.
- the light-emitting device uses a phosphor wheel type wavelength converter that is rotated by a rotary drive device such as a motor.
- Patent Document 1 discloses a light source device including a light source and a phosphor wheel having a first substrate and a second substrate.
- the phosphor wheel has a first phosphor and a second phosphor disposed between a first substrate and a second substrate, the first phosphor and the second phosphor comprising: They are arranged at different positions in the rotation direction of the phosphor wheel.
- the first phosphor is in contact with the first substrate and the second substrate, and the second phosphor is in contact with the second substrate.
- the phosphor wheel type wavelength conversion body needs to be rotated using a rotary drive device, the structure of the light emitting device is complicated and miniaturization is difficult.
- the use of a rotary drive device may increase the risk of failure of the light emitting device.
- An object of the present invention is to provide a wavelength converter capable of increasing the luminous efficiency of phosphors without using a rotary drive device, and a light-emitting device using the wavelength converter.
- a wavelength converter includes phosphor ceramics containing a first phosphor that emits fluorescence due to parity forbidden transition and fluorescence due to parity allowed transition. and a phosphor section containing a second phosphor.
- the main surface of the phosphor ceramic has an uneven structure including a plurality of protrusions and a plurality of recesses, and the phosphor portions are arranged inside the plurality of recesses in the phosphor ceramic.
- a light-emitting device comprises the above-described wavelength converter, a solid-state light source that irradiates the wavelength converter and emits light having an emission peak within a wavelength range of 400 nm or more and less than 500 nm, Prepare.
- FIG. 1(a) is a schematic diagram showing a light-emitting device with a wavelength conversion body containing a phosphor that emits fluorescence due to parity-allowed transitions.
- FIG. 1(b) is a schematic diagram showing a light-emitting device with a wavelength converter containing a phosphor that emits fluorescence by parity-forbidden transition.
- FIG. 2 is a schematic diagram showing a light-emitting device comprising both a wavelength conversion body including phosphors emitting fluorescence due to parity-allowed transitions and a wavelength conversion body including phosphors emitting fluorescence due to parity-forbidden transitions.
- FIG. 3 is a perspective view schematically showing an example of the wavelength conversion body according to this embodiment.
- FIG. 4 is a perspective view schematically showing another example of the wavelength conversion body according to this embodiment.
- FIG. 5 is a diagram schematically showing another example of the wavelength conversion body according to this embodiment.
- FIG. 6 is a schematic perspective view for explaining the method of manufacturing the wavelength conversion body according to this embodiment.
- FIG. 7 is a schematic diagram showing an example of a light-emitting device provided with a wavelength converter according to this embodiment.
- FIG. 8 is a schematic diagram showing another example of a light-emitting device provided with a wavelength converter according to this embodiment.
- FIG. 9 is a schematic diagram showing an example of an electronic device provided with the light emitting device according to this embodiment.
- FIG. 10 is a schematic diagram showing another example of an electronic device including the light emitting device according to this embodiment.
- FIG. 11 is a photograph of a wavelength conversion body produced in an example viewed from above.
- FIG. 12 is a perspective view schematically showing a wavelength converter according to a comparative example.
- FIG. 13 is a graph showing the relationship between the output of laser light when irradiated with laser light as excitation light and the output of fluorescence emitted from the wavelength converter in the wavelength converters according to Examples and Comparative Examples. be.
- FIG. 14 is a graph showing the relationship between the output of laser light and the spectral distribution of fluorescence emitted from the wavelength converter when the wavelength converter according to the example is irradiated with laser light as excitation light.
- FIG. 15 is a graph showing the relationship between the output of laser light and the spectral distribution of fluorescence emitted from the wavelength converter when the wavelength converter according to the comparative example is irradiated with laser light as excitation light.
- a light-emitting device comprising a combination of a solid-state light source and a phosphor includes a solid-state light source 2 that emits primary light (excitation light), a wavelength converter 3 containing a phosphor, and a wavelength converter 3. and a base material 4 holding on the surface thereof.
- the solid-state light source 2 is a light emitting element that emits laser light L as primary light, and for example, a laser diode such as a surface emitting laser diode can be used.
- the wavelength converter 3 Upon receiving the laser light L, the wavelength converter 3 emits fluorescence F having a longer wavelength than the laser light L. As shown in FIG. That is, the wavelength converter 3 receives the laser light L from the front surface 3a and emits the fluorescence F from the rear surface 3b.
- the base material 4 has a transparency that allows the laser light L to pass therethrough, and the laser light L incident from the main surface 4a, which is the surface of the base material 4, is transmitted therethrough.
- the transparent base material 4 for example, a quartz base material, a sapphire base material, or a translucent fluorescent ceramics base material is used.
- the laser light L irradiated onto the base material 4 passes through the base material 4 and the wavelength converter 3 . Then, when the laser light L is transmitted through the wavelength converter 3 , the phosphor contained in the wavelength converter 3 absorbs a part of the laser light L and emits fluorescence F. Thereby, the light emitting device 1 emits light including the laser light L and the fluorescence F as the output light. Therefore, for example, when the laser light L is blue and the fluorescence F is yellow, additive color mixture of the laser light L and the fluorescence F emits white output light.
- the phosphor contained in the wavelength converter 3 (3A) is a phosphor that emits fluorescence due to parity-allowed transition
- the phosphor has a high transition probability and thus efficiently absorbs the laser light L. be able to.
- the phosphor is, for example, Ce 3+ -activated yttrium aluminum garnet (Y 3 Al 2 (AlO 4 ) 3 :Ce 3+ , YAG:Ce 3+ )
- the phosphor is a blue laser beam L , and emits yellow fluorescence F. Therefore, as shown in FIG.
- the thickness t1 of the wavelength converter 3A in the light-emitting device 1, when the phosphor contained in the wavelength converter 3A is a phosphor that emits fluorescence due to parity-allowed transition, the thickness t1 of the wavelength converter 3A is set to It can be made relatively thin. Specifically, the thickness t1 of the wavelength conversion body 3A can be, for example, 50 ⁇ m to 100 ⁇ m.
- the transition probability of the phosphor is low. cannot be absorbed.
- the phosphor is, for example, a Cr3+-activated (Gd,La) 3 (Ga,Sc) 2 ( GaO4 ) 3 : Cr3 + phosphor (GSG phosphor)
- the phosphor is It absorbs about 60% of blue laser light L and emits near-infrared fluorescence F. Therefore, as shown in FIG.
- the thickness t2 of the wavelength converter 3B is It is necessary to increase the wavelength conversion efficiency by making it relatively thick. Specifically, the thickness t2 of the wavelength converter 3B should be, for example, 300 ⁇ m to 400 ⁇ m.
- a light-emitting device that emits both white light and near-infrared light as output light.
- a light-emitting element that emits blue laser light L is used as the solid-state light source 2
- a member containing a YAG:Ce 3+ phosphor is used as the wavelength converter 3A
- a member containing a GSG phosphor is used as the wavelength converter 3B.
- the wavelength converter 3A is laminated above the substrate 4, and the wavelength converter 3B is further laminated above the wavelength converter 3A.
- the wavelength converter 3B is laminated above the substrate 4, and the wavelength converter 3A is further laminated above the wavelength converter 3B.
- the irradiated laser light L is emitted from the base material 4 and the wavelength converters 3A and 3B. pass through.
- the YAG:Ce 3+ phosphor contained in the wavelength converter 3A absorbs part of the laser light L and emits yellow fluorescence.
- the GSG phosphor contained in the wavelength converter 3B partially absorbs the laser light L and emits near-infrared fluorescence. Therefore, the light-emitting device in FIG. 2 can emit both white light generated by additive color mixing of the laser light L and yellow fluorescence and near-infrared light from the light emission surface O. As shown in FIG.
- the thickness of the wavelength converter 3A can be made relatively thin.
- the phosphor contained in the wavelength converter 3B is a phosphor that emits fluorescence due to parity forbidden transition, it is necessary to increase the wavelength conversion efficiency by increasing the thickness of the wavelength converter 3B. Therefore, in the light emitting device 1B shown in FIG. 2(a), the yellow fluorescence emitted from the wavelength converter 3A is blocked by the thick-film wavelength converter 3B, and cannot be sufficiently transmitted through the wavelength converter 3B. may not be possible. Further, in the light emitting device 1C shown in FIG. 2B, the laser light L transmitted through the base material 4 may be absorbed by the wavelength converter 3B and may not sufficiently reach the wavelength converter 3A.
- the wavelength converter 3A and the wavelength converter 3B are laminated in the thickness direction of the substrate 4. Therefore, due to the thick-film wavelength converter 3B, There is a problem that the extraction efficiency of white light is lowered, resulting in insufficient luminous efficiency as a whole.
- the wavelength conversion body of the present embodiment includes both a phosphor that emits fluorescence due to parity-allowed transition and a phosphor that emits fluorescence due to parity-forbidden transition, it is possible to increase light extraction efficiency and improve luminous efficiency. It has a configuration that allows
- the wavelength converter 10 includes phosphor ceramics 11 and a phosphor portion 12 .
- a plurality of protrusions 11b are formed on the main surface 11a of the phosphor ceramic 11, and recesses 11c are formed between adjacent protrusions 11b. Inside the recesses 11c of the phosphor ceramic 11, the phosphor portions 12 are arranged.
- the wavelength converter 10 includes phosphor ceramics 11 that are substantially rectangular parallelepiped (plate-shaped) as a whole.
- a concave portion 11c is formed by cutting the phosphor ceramic 11 from one main surface 11a to the other main surface 11d. Further, the concave portion 11c is formed from one end to the other end of the phosphor ceramic 11 along the z-axis direction in FIG.
- a convex portion 11b is formed between adjacent concave portions 11c. Therefore, one main surface 11a of the phosphor ceramic 11 and the other main surface 11d on the opposite side of the main surface 11a have an uneven structure including a plurality of protrusions 11b and a plurality of recesses 11c.
- the wavelength converter 10 has a structure in which the convex portions 11b of the phosphor ceramics 11 and the phosphor portions 12 are alternately laminated along the x-axis direction in FIG.
- the thickness t of the wavelength converter 10, in other words, the thickness t of the phosphor ceramics 11 is not particularly limited, but is preferably 100 ⁇ m to 800 ⁇ m, more preferably 200 ⁇ m to 600 ⁇ m, and more preferably 300 ⁇ m to 500 ⁇ m. More preferred.
- the phosphor ceramic 11 contains a first phosphor that emits fluorescence due to parity forbidden transition. Therefore, since it is necessary to increase the wavelength conversion efficiency of the first phosphor by making the thickness t relatively large, the thickness t is preferably set within the above range.
- the phosphor ceramic 11 contains a first phosphor that emits fluorescence due to parity forbidden transition.
- the phosphor ceramic 11 preferably contains the first phosphor as a main component and is a molded body made entirely of an inorganic material. Accordingly, since the phosphor ceramic 11 has high thermal conductivity, it is possible to suppress the temperature quenching of the first phosphor and increase the luminous efficiency.
- the phosphor ceramic 11 is preferably a sintered body containing the first phosphor, and more preferably a sintered body made of the first phosphor. That is, the phosphor ceramic 11 is a sintered powder obtained by pressing the powder of the first phosphor or the raw material powder of the first phosphor to form a compact, and then firing the compact. A body is preferred.
- the phosphor ceramics 11 may be a molded body formed by binding the particles of the first phosphor using a binder made of an inorganic material.
- the first phosphor is a phosphor that emits fluorescence due to parity forbidden transition (first fluorescence). That is, since the light emission of the first phosphor is caused by the parity forbidden transition, the absorptivity of the excitation light tends to decrease.
- a phosphor that emits fluorescence based on electron energy transition of transition metal ions can be used.
- a phosphor containing at least one ion selected from the group consisting of Cr, Mn, Fe, Cu and Ni as an activator (luminescence center element) can be used as an activator (luminescence center element).
- a phosphor containing at least one of Cr 3+ and Mn 4+ as an activator can be used as the first phosphor.
- the matrix of the first phosphor is not particularly limited, but at least one selected from the group consisting of oxides, sulfides, nitrides, halides, oxysulfides, oxynitrides and oxyhalides can be used. can.
- the activator of the first phosphor absorbs the excitation light (primary light) emitted from the solid-state light source and converts it into a light component having a longer wavelength than the excitation light.
- the activator of the first phosphor is an ion capable of emitting fluorescence due to parity-forbidden transition, and is preferably at least one of Cr 3+ and Mn 4+ , for example.
- aluminosilicates, oxynitride silicates, and oxynitride aluminosilicates are aluminosilicates, oxynitride silicates, and oxynitride aluminosilicates. Therefore, the one suitable for lighting design may be appropriately selected and used from among these.
- the activator of the first phosphor is preferably Cr 3+ .
- Cr 3+ it is possible to obtain the first phosphor having the property of absorbing visible light, especially blue light or red light, and converting it into light components of deep red to near infrared.
- many Cr 3+ -activated phosphors that absorb blue light and red light and convert them into near-infrared fluorescent components are also known.
- the phosphor whose fluorescent ion is Cr 3+ is not particularly limited as long as it absorbs excitation light and converts it into fluorescence with a longer wavelength than the excitation light . You can choose.
- the Cr 3+ -activated phosphor is preferably a phosphor based on a composite metal oxide, which is easy to manufacture.
- the Cr 3+ -activated phosphor is preferably a composite oxide phosphor having a garnet-type crystal structure, which has been widely used in practical applications.
- Such a Cr 3+ -activated garnet phosphor is preferably at least one of a rare earth aluminum garnet phosphor and a rare earth gallium garnet phosphor.
- the Cr 3+ -activated garnet phosphor is Y 3 Al 2 (AlO 4 ) 3 :Cr 3+ , La 3 Al 2 (AlO 4 ) 3 :Cr 3+ , Gd 3 Al 2 (AlO 4 ) 3 :Cr 3+ , Y3Ga2 ( AlO4 ) 3 : Cr3 + , La3Ga2 ( AlO4 ) 3 : Cr3 + , Gd3Ga2 ( AlO4 ) 3 : Cr3 + , Y3Sc2 ( AlO4 ) 3 : Cr 3+ , La 3 Sc 2 (AlO 4 ) 3 : Cr 3+ , Gd 3 Sc 2 (AlO 4 ) 3 : Cr 3+ , Y 3 Ga 2 (GaO 4 ) 3 : Cr 3+ , La 3 Ga 2 (GaO 4 ) 3 : Cr 3+ , (Gd, La) 3 Ga 2 (GaO 4 ) 3 : Cr 3
- the first phosphor preferably contains Cr as an emission center element and has an emission peak within the wavelength range of 700 nm or more and less than 1600 nm.
- Such a first phosphor can absorb excitation light and emit near-infrared light. Therefore, by using the wavelength conversion body 10 including the first phosphor, it is possible to obtain a light-emitting device that is advantageous for imaging and sensing using near-infrared light, as well as medical and cosmetic applications.
- the phosphor section 12 contains a second phosphor that emits fluorescence due to parity-allowed transition.
- the phosphor part 12 is preferably a sealing body obtained by sealing particles of the second phosphor with a sealing material.
- the sealing material is not particularly limited as long as it can transmit visible light, but it is preferably at least one of an organic material and an inorganic material, particularly at least one of a transparent organic material and a transparent inorganic material.
- at least one of a silicone resin and an epoxy resin can be used as the organic sealing material.
- Low-melting-point glass for example, can be used as the inorganic sealing material.
- the second phosphor is a phosphor that emits fluorescence due to parity-allowed transitions (second fluorescence). In other words, the emission of light from the second phosphor is caused by parity-allowed transitions, and thus the absorptance of the excitation light tends to be high.
- a phosphor containing at least one selected from the group consisting of Ce 3+ , Eu 2+ and Yb 2+ as an activator can be used.
- the matrix of the second phosphor is not particularly limited, for example, at least one selected from the group consisting of oxides, sulfides, nitrides, halides, oxysulfides, oxynitrides and oxyhalides can be used. can.
- the activator of the second phosphor absorbs the excitation light (primary light) emitted from the solid-state light source and converts it into a light component having a longer wavelength than the excitation light.
- the activator of the second phosphor is an ion capable of emitting fluorescence due to parity-allowed transition, and may be, for example, at least one selected from the group consisting of Ce 3+ , Eu 2+ and Yb 2+ . preferable.
- aluminosilicates, oxynitride silicates, and oxynitride aluminosilicates are aluminosilicates, oxynitride silicates, and oxynitride aluminosilicates. Therefore, for the second phosphor, one suitable for lighting design may be appropriately selected and used.
- a phosphor that is particularly preferable as the second phosphor is a complex oxide phosphor that has a garnet-type crystal structure and is activated with Ce 3+ .
- Such Ce 3+ -activated garnet phosphors include Lu 3 Al 2 (AlO 4 ) 3 :Ce 3+ , Y 3 Al 2 (AlO 4 ) 3 :Ce 3+ , Lu 3 Ga 2 (AlO 4 ) 3 :Ce 3+ , and Y 3 Ga 2 (AlO 4 ) 3 :Ce 3+ .
- the Ce 3+ -activated garnet phosphor may be a solid solution containing these phosphors as end members.
- Ce 3+ -activated garnet phosphors have the property of absorbing blue light and converting it into yellow to green light. Further, as described above, many Cr 3+ -activated garnet phosphors have the property of absorbing blue or red light and converting it into deep red to near-infrared light. Therefore, by using a solid-state light source that emits blue light, a Cr 3+ -activated garnet phosphor as the first phosphor, and a Ce 3+ -activated garnet phosphor as the second phosphor, the three primary colors of light are configured. It is possible to obtain an output light that includes a light component that emits light and a near-infrared light component.
- the second phosphor preferably contains Ce as an emission center element and has an emission peak within the wavelength range of 500 nm or more and less than 600 nm.
- a second phosphor can absorb excitation light and emit green-yellow-orange fluorescence. Therefore, by combining the solid-state light source emitting blue excitation light and the wavelength conversion body 10 containing the second phosphor, it is possible to emit white light generated by additive color mixture of blue excitation light and fluorescence. . Then, the white light can be used as illumination light.
- the phosphor part 12 preferably further contains a third phosphor having an emission peak within the wavelength range of 600 nm or more and less than 700 nm, in addition to the second phosphor.
- the phosphor part 12 is preferably a sealing body obtained by sealing both the particles of the second phosphor and the particles of the third phosphor with a sealing material.
- Such a third phosphor can absorb excitation light and emit red fluorescence.
- the solid-state light source emitting blue excitation light and the second phosphor are combined. By combining them, white light can be emitted.
- red light is additively mixed with the white light, so that the color rendering of the white light can be enhanced.
- the third phosphor is not particularly limited as long as it is a phosphor having an emission peak within the wavelength range of 600 nm or more and less than 700 nm. can be used.
- Such Eu 2+ -activated nitride-based phosphors include alkaline earth metal oxynitride aluminosilicates, alkaline earth metal oxynitride aluminosilicates, alkaline earth metal oxynitride aluminosilicates, and alkaline earth metal oxynitride aluminosilicates. Mention may be made of salt phosphors.
- MAlSiN 3 :Eu 2+ , MAlSi 4 N 7 :Eu 2+ , and M 2 Si 5 N 8 :Eu 2+ can be mentioned as Eu 2+ -activated nitride phosphors.
- M is at least one element selected from the group consisting of Ca, Sr and Ba.
- Eu 2+ -activated nitride-based phosphor a phosphor obtained by replacing part of the combination of Si 4+ -N 3+ in the composition of the above compound with Al 3+ -O 2- can also be mentioned.
- the action of the wavelength converter 10 having the above configuration will be described.
- a light-emitting device using the wavelength conversion body 10 as shown in FIG. can be configured.
- the primary light L applied to the main surface 11 d (lower surface) of the wavelength converter 10 passes through the wavelength converter 10 .
- the first phosphor contained in the phosphor ceramics 11 absorbs at least part of the primary light L and converts it into first fluorescence.
- the first fluorescent light is radiated upward.
- the second phosphor contained in the phosphor portion 12 absorbs at least part of the primary light L and converts it into second fluorescence. Then, the second fluorescent light is emitted upward from the upper surface of the phosphor section 12 . Output light, which is a mixture of the first fluorescent light and the second fluorescent light, is then emitted from the light exit surface of the light emitting device.
- the first phosphor contained in the phosphor ceramic 11 is a phosphor that emits fluorescence due to parity forbidden transition. Therefore, since the first phosphor cannot efficiently absorb the primary light L emitted from the solid-state light source 20, the phosphor ceramic 11 needs to contain a large amount of the first phosphor. However, since the phosphor ceramic 11 is a sintered body containing the first phosphor, the filling rate of the first phosphor is high. Therefore, the phosphor ceramics 11 as a whole can efficiently absorb the primary light L and convert the wavelength into the first fluorescence. Also, by adjusting the thickness t of the phosphor ceramics 11, the conversion efficiency from the primary light L to the first fluorescence can be optimized.
- the phosphor part 12 included in the phosphor ceramics 11 is a phosphor that emits fluorescence due to parity-allowed transition. Therefore, since the second phosphor can efficiently absorb the primary light L emitted from the solid-state light source, the phosphor part 12 need not contain a large amount of the second phosphor. Further, as described above, the phosphor part 12 is preferably a sealing body obtained by sealing particles of the second phosphor with a sealing material. Therefore, by adjusting the amount of the second phosphor dispersed in the phosphor portion 12, the conversion efficiency from the primary light L to the second fluorescence can be optimized.
- the conversion efficiency from the primary light L to the second fluorescence can also be adjusted by adjusting the thickness of the phosphor portion 12 filled in the concave portion 11c of the phosphor ceramic 11, that is, the thickness in the y-axis direction in FIG. can be optimized.
- the phosphor ceramic 11 has an uneven structure consisting of a plurality of protrusions 11b and a plurality of recesses 11c.
- the interior of the phosphor ceramic 11 is finely divided by the plurality of concave portions 11c.
- the interior of the phosphor ceramic 11 is separated by the recesses 11c. Therefore, the first fluorescence whose wavelength has been converted within the phosphor ceramics 11 is difficult to guide along the x-axis in FIG. .
- the wavelength-converted second fluorescence in the phosphor portion 12 is also difficult to guide along the x-axis, so that the second fluorescence is less likely to emerge from the side surface 11 e of the phosphor ceramics 11 .
- the first fluorescent light and the second fluorescent light are more likely to be emitted from the main surface 11a (upper surface) of the phosphor ceramic 11, so that the extraction efficiency of the fluorescent light from the wavelength converter 10 can be increased. .
- the first phosphor contained in the phosphor ceramics 11 may generate heat due to energy loss caused by wavelength conversion from excitation light to first fluorescence.
- the whole phosphor ceramic 11 is made of an inorganic material, it has high thermal conductivity. Therefore, even when the first phosphor generates heat, the heat can be released to the outside through the phosphor ceramics 11, and as a result, temperature quenching of the first phosphor can be suppressed.
- the second phosphor may also generate heat due to energy loss caused by wavelength conversion from the excitation light to the second fluorescence, like the first phosphor.
- the phosphor portion 12 containing the second phosphor is arranged inside the concave portion 11 c of the phosphor ceramics 11 , the phosphor portion 12 is in direct contact with the phosphor ceramics 11 . Further, the phosphor portion 12 is sandwiched between adjacent convex portions 11b.
- the phosphor ceramic 11 is made of an inorganic material, it has high thermal conductivity.
- the heat can be released to the outside through the sealing material of the phosphor part 12 and the phosphor ceramics 11, and as a result, temperature quenching of the second phosphor can be suppressed. can be done.
- the wavelength converter 10A of this embodiment may have a bottom wall portion 11f on the other main surface 11d of the phosphor ceramics 11 .
- the bottom wall portion 11f is a plate member made of a sintered body containing the first phosphor, like the convex portion 11b, and is formed on the entire main surface 11d.
- the convex portion 11b and the bottom wall portion 11f are integrally formed, and the concave portion 11c is formed by the convex portion 11b and the bottom wall portion 11f.
- the phosphor ceramic 11A is produced by first producing a substantially rectangular parallelepiped (plate-like) sintered body containing the first phosphor, and then cutting out the surface of the sintered body by dicing or the like. Thereby, the recess 11c is formed. Therefore, in the phosphor ceramic 11A, the convex portion 11b and the bottom wall portion 11f are integrated.
- the wavelength converter 10A can be obtained.
- the primary light L passes through the bottom wall portion 11f and reaches the convex portion 11b of the phosphor ceramics 11 and the phosphor portion 12.
- the first phosphor absorbs at least part of the primary light L, converts it into first fluorescence, and emits the first fluorescence upward from main surface 11a.
- the second phosphor absorbs at least part of the primary light L, converts it into second fluorescence, and emits the second fluorescence upward from the upper surface of the phosphor section 12 .
- the wavelength conversion body of the present embodiment can be a striped type in which phosphor ceramics 11 and phosphor portions 12 are alternately laminated when viewed from above.
- the wavelength conversion body of this embodiment is not limited to such a shape.
- it may be a dot type in which phosphor portions 12 are dispersed in a matrix of phosphor ceramics 11 when viewed from above.
- a dot type in which phosphor ceramics 11 are dispersed in a matrix of phosphor portions 12 when viewed from above may be used.
- FIG. 5(a) is a plan view showing a configuration in which phosphor portions 12 are dispersed in a matrix of phosphor ceramics 11 when viewed from above.
- FIG. 5(b) is a cross-sectional view taken along line BB in FIG. 5(a).
- FIG. 5(c) is a plan view showing a configuration in which the phosphor ceramics 11 are dispersed in the matrix of the phosphor portion 12 when viewed from above.
- FIG. 5(d) is a cross-sectional view taken along line DD in FIG. 5(c).
- the wavelength conversion body 10B has a structure in which a plurality of phosphor parts 12B are dispersed in a grid matrix of phosphor ceramics 11B.
- the wavelength converter 10B can emit output light containing a large amount of the first fluorescence.
- the phosphor portion 12B is surrounded by phosphor ceramics 11B. Therefore, even when the second phosphor generates heat, heat can be efficiently released through the phosphor ceramics 11B, and temperature quenching of the second phosphor can be suppressed. Further, as shown in (c) and (d) of FIG.
- the wavelength converter 10C has a structure in which a plurality of phosphor ceramics 11C are dispersed in a lattice matrix of phosphor portions 12C. In this case, since the proportion of the phosphor portion 12C is higher than that of the phosphor ceramics 11C, the wavelength converter 10C can emit output light containing a large amount of the second fluorescence.
- the average length PSm of the cross-sectional curve elements in the concave-convex structure is 400 ⁇ m or less.
- the average length PSm of the cross-sectional curvilinear elements specified in Japanese Industrial Standard JIS B0601 is preferably 400 ⁇ m or less.
- the average length PSm of the cross-sectional curvilinear element is 400 ⁇ m or less, the period of the protrusions 11b and the recesses 11c is reduced, so that the heat dissipation characteristics of the protrusions 11b can be enhanced, and temperature quenching can be further suppressed. Further, as described above, the first fluorescent light is emitted from the upper surface of the convex portion 11b, and the second fluorescent light is emitted from the upper surface of the phosphor portion 12. Therefore, the average length PSm is set within the above range and the convex By making the periodic structure of the portion 11b finer, it is possible to suppress uneven fluorescence emission.
- the average length PSm of the cross-sectional curve elements in the concave-convex structure is more preferably 350 ⁇ m or less, even more preferably 300 ⁇ m or less, and particularly preferably 250 ⁇ m or less. Also, the lower limit of the average length PSm is not particularly limited, but can be set to 50 ⁇ m, for example.
- the wavelength conversion body of this embodiment may be fixed by placing it on the surface of the substrate, like the wavelength conversion bodies shown in FIGS. 1 and 2 . With such a configuration, the durability and impact resistance of the wavelength converter can be enhanced.
- the base material can be translucent.
- a base material is not particularly limited, but for example, a base material made of quartz, sapphire, or translucent fluorescent ceramics can be used.
- a substrate having characteristics of reflecting the excitation light emitted from the solid-state light source and the fluorescence emitted from the first phosphor and the second phosphor can be used.
- the base material can have light reflectivity.
- a substrate made of metal can be used, and specifically, a substrate made of aluminum can be used.
- a substantially rectangular parallelepiped (plate-like) sintered body 11D containing a first phosphor is produced.
- the sintered body 11D can be obtained by pressing the powder of the first phosphor to form a green compact, and then firing the green compact. Further, the sintered body 11D can be obtained by pressing raw material powder for synthesizing the first phosphor to form a green compact, and then firing the green compact.
- recesses 11c are formed by notching the main surface of the sintered body 11D.
- a method for forming the concave portion 11c is not particularly limited, but it can be performed using, for example, a dicing saw.
- the recess 11c may be formed in the sintered body 11D using a drill or the like. By forming the concave portion 11c in this manner, the phosphor ceramic 11 can be obtained.
- the concave portion 11c can be formed by cutting halfway through the sintered body 11D from one main surface to the other main surface of the sintered body 11D.
- the recesses 11c of the obtained phosphor ceramic 11 are filled with a sealing material in which the second phosphor is dispersed.
- the wavelength converter can be obtained by polishing the main surface and side surfaces of the phosphor ceramics 11 as necessary.
- the wavelength conversion body 10A of FIG. 6(c) has a bottom wall portion 11f. Therefore, as shown in FIG. 6D, the bottom wall portion 11f is removed by polishing to obtain the wavelength converter 10 shown in FIG.
- the wavelength converter 10 of the present embodiment includes the phosphor ceramics 11 containing the first phosphor that emits fluorescence due to parity forbidden transition and the second phosphor that emits fluorescence due to parity allowed transition. and a phosphor portion 12 containing it.
- the main surface 11a of the phosphor ceramic 11 has an uneven structure including a plurality of protrusions 11b and a plurality of recesses 11c. Inside the recesses 11c of the phosphor ceramic 11, the phosphor portions 12 are arranged.
- the phosphor ceramics 11 is a sintered body containing the first phosphor, so the filling rate of the first phosphor is high. Therefore, the phosphor ceramics 11 as a whole can efficiently absorb the excitation light and convert the wavelength. Furthermore, by adjusting the thickness t of the phosphor ceramics 11, the conversion efficiency from the excitation light to the first fluorescence can be optimized. In addition, since the second phosphor is dispersed in the phosphor portion 12, by adjusting the amount of the second phosphor and the thickness of the phosphor portion 12, the excitation light is converted into the second fluorescence. Efficiency can be optimized.
- the wavelength converter 10 of the present embodiment can increase the luminous efficiency of the phosphor without using a rotary drive device.
- the phosphor ceramics 11 and the phosphor portions 12 are alternately laminated. Further, when the wavelength conversion body 10 is viewed from above, the phosphor part 12 is arranged separately through the phosphor ceramics 11, or the phosphor ceramics 11 is arranged separately through the phosphor part 12. It is also preferable that With such a configuration, the first fluorescence is directly emitted from the phosphor ceramics 11 portion on the light emission surface (main surface 11a) of the wavelength conversion body 10, and the second fluorescence is emitted from the phosphor portion 12 portion on the light emission surface. Fluorescence is emitted directly. Therefore, it is possible to enhance the extraction efficiency of the first fluorescence and the second fluorescence from the wavelength conversion body 10 .
- the thermal conductivity of the phosphor ceramics 11 is preferably higher than the thermal conductivity of the phosphor portion 12 .
- the phosphor portion 12 is arranged in the concave portion 11 c of the phosphor ceramics 11 . Therefore, by making the thermal conductivity of the phosphor ceramics 11 higher than that of the phosphor part 12, the heat dissipation of the first phosphor and the second phosphor can be promoted, and the temperature quenching of these can be suppressed.
- the light-emitting device 100 of the present embodiment includes the above-described wavelength converter 10 and a solid-state light source 20 that emits light (excitation light, primary light L) that irradiates the wavelength converter 10. ing.
- a solid-state light source 20 a solid-state light-emitting element that emits primary light L having an emission peak within a wavelength range of 400 nm or more and less than 500 nm, preferably 440 nm or more and less than 480 nm can be used.
- a light emitting diode (LED) or laser diode can be used for the solid-state light source 20 for example.
- a light emitting diode (LED) or laser diode can be used.
- a light-emitting device that can be expected to have an optical output of several hundred mW class can be obtained.
- an LED module or the like that emits high-energy light of 3 W or more or 10 W or more a light output of several W can be expected.
- the light emitting device can be expected to have a light output exceeding 10 W.
- the light-emitting device can be expected to have a light output exceeding 30 W.
- the wavelength conversion body 10 is radiated with high-density spot light. Therefore, the obtained light-emitting device can be a high-output point light source, and thus the range of industrial use of solid-state lighting can be expanded.
- a laser diode for example, an edge emitting laser (EEL), a vertical cavity surface emitting laser (VCSEL), or the like can be used.
- a light guide member such as an optical fiber may be interposed between the wavelength converter 10 and the solid-state light source 20 .
- the wavelength converter 10 and the solid-state light source 20 can be configured to be spatially separated from each other. Therefore, the light-emitting portion is light and can be freely moved, and as a result, the light-emitting device can easily change the irradiation place.
- the solid-state light source 20 is preferably at least one of a light-emitting diode and a laser diode.
- the solid-state light source 20 is not limited to these, and any light-emitting element can be used as long as it can emit high-output primary light.
- the number of solid-state light sources 20 included in the light-emitting device is not particularly limited, and may be singular or plural. By using a plurality of solid-state light sources 20, the output of the primary light can be easily increased, so that the light emitting device is advantageous in increasing the output.
- the number of solid-state light sources 20 is not particularly limited. . Also, the upper limit of the number is not particularly limited, but for example, 9 or less, 16 or less, 25 or less, 36 or less, 49 or less, 64 or less, 81 or less, 100 or less, as appropriate. You can choose.
- the solid-state light source 20 is preferably a surface-emitting type surface-emitting light source.
- the primary light emitted by the solid-state light source 20 is directly irradiated onto the phosphor ceramics 11 and the phosphor portion 12 of the wavelength converter 10 . That is, at least part of the primary light L irradiated to the lower surface of the wavelength conversion body 10 is absorbed by the first phosphor contained in the phosphor ceramics 11 and the second phosphor contained in the phosphor portion 12. .
- the first phosphor converts the primary light L into a first fluorescence and the second phosphor converts the primary light L into a second fluorescence.
- Output light which is a mixture of the first fluorescent light and the second fluorescent light, is then emitted from the light exit surface of the light emitting device.
- the output light may contain the primary light L transmitted through the wavelength converter 10 in addition to the first fluorescent light and the second fluorescent light.
- the wavelength converter 10 may be fixed by placing it on the surface of the substrate.
- FIG. 8 shows a light-emitting device 100A in which the wavelength converter 10 is fixed by a base material 13 having translucency.
- the primary light L irradiated toward the substrate 13 from below passes through the substrate 13 and reaches the wavelength converter 10 .
- the primary light L is wavelength-converted by the first phosphor contained in the phosphor ceramics 11 and the second phosphor contained in the phosphor portion 12 .
- output light in which the first fluorescence and the second fluorescence are mixed is emitted from the emission surface of the light emitting device 100A.
- the output light may contain the primary light L transmitted through the substrate 13 and the wavelength converter 10 in addition to the first fluorescence and the second fluorescence.
- the light-emitting device of this embodiment can increase the absolute number of photons forming the output light by using a high-power solid-state light source 20 or increasing the number of solid-state light sources 20 . This allows the light energy of the output light emitted from the light emitting device to exceed 3W, preferably 10W, more preferably 30W.
- a high-power light emitting device it is possible to illuminate with strong output light (for example, near-infrared light), so even if the distance from the irradiation target is large, relatively strong near-infrared light can be emitted. can do. Further, even if the object to be irradiated is minute or thick, the light-emitting device can easily obtain information about the object.
- the light-emitting device uses a light-emitting element such as a laser diode that emits high-density primary light as the solid-state light source 20, or collects the light emitted by the solid-state light source 20 with an optical lens, and supplies it to the phosphor. It is also possible to increase the photon density.
- the optical energy density of the primary light emitted by the solid-state light source 20 can be greater than 0.3 W/mm 2 , preferably 1.0 W/mm 2 , more preferably 3.0 W/mm 2 . In this case, since the optical energy density of the primary light is high, even if the wavelength conversion body is irradiated with the diffused primary light, the light emitting device emits relatively strong output light.
- the wavelength conversion body is irradiated with primary light that is not diffused
- a light emitting device that emits output light with a high light energy density can be obtained. Therefore, it is possible to provide a light-emitting device that can irradiate output light over a large area and a light-emitting device that irradiates output light with high light energy density while using a light-emitting element having a small light-emitting surface. Furthermore, for example, it becomes a light-emitting device capable of point-outputting near-infrared light having a high optical energy density.
- the upper limit of the optical energy density of the primary light emitted by the solid-state light source is not particularly limited, it can be set to 30 W/mm 2 , for example.
- the wavelength converter can reduce the energy density of the emitted light to 0.3 W/mm 2 , preferably 1.0 W/mm 2 , more preferably 1.0 W/mm 2 . can be greater than 3.0 W/mm 2 .
- the intensity of the light component in the wavelength region shorter than 440 nm in the output light can be less than 3% of the maximum fluorescence intensity.
- the intensity of the light component in the wavelength region shorter than 440 nm in the output light can also be adjusted to be less than 1% of the maximum fluorescence intensity. In this way, since the intensity of the light component in the ultraviolet to blue wavelength region, to which the photoresist is likely to be exposed, becomes output light whose intensity is close to zero, the light emitting device is advantageous for inspection work related to semiconductors.
- the light emitting device of this embodiment may further include a light distribution control mechanism for controlling light distribution characteristics. With such a configuration, it becomes a light-emitting device that is advantageous in obtaining output light having a desired light distribution characteristic, for example, in a vehicle-mounted variable light distribution lighting system.
- the light emitting device of the present embodiment may further include an output intensity variable mechanism for changing the intensity of output light, such as an input power control device.
- an output intensity variable mechanism for changing the intensity of output light such as an input power control device.
- the light emitting device of this embodiment may further include a variable mechanism that changes the peak wavelength of the light component having the maximum fluorescence intensity within the wavelength range of 700 nm or more and less than 2500 nm, for example.
- a variable mechanism of fluorescence peak wavelength for example, an optical filter such as a band-pass filter or a low-cut filter can be used.
- the light-emitting device of this embodiment may further include a light control mechanism for controlling ON-OFF of at least part of the output light. Even with such a configuration, the light-emitting device has great versatility and can easily be used for miscellaneous uses.
- the light emitting device of the present embodiment can convert visible light components with a wavelength of less than 700 nm and light components with a wavelength of 700 nm or more in the output light into pulsed light.
- the half width of the pulsed light irradiation time can be less than 300 ms. Also, the higher the output intensity of the output light, the shorter the half width. Therefore, the half width can be set to less than 100 ms, less than 30 ms, less than 10 ms, less than 3 ms, or less than 1 ms according to the output intensity of the output light. Note that the pulsed light extinguishing time can be set to 1 ms or more and less than 10 s.
- one preferred form is a light-off time of less than 30 ms, at which these creatures do not perceive flicker.
- the extinguishing time of the pulsed light is preferably 100 ms or more, particularly 300 ms or more.
- the light energy of the output light which is preferable for the purpose of adjusting the growth of human hair or body hair, is 0.01 J/cm 2 or more and less than 1 J/cm 2 .
- the light energy of the output light emitted from the light emitting device is set within this range and the vicinity of the hair root is irradiated with the output light, the light can be absorbed by the melanin existing inside the skin. As a result, the growth of hair or the like can be adjusted.
- the 1/10 afterglow time of the output light that is, the time until the light intensity immediately before turning off is reduced to 1/10 is preferably less than 100 ⁇ s, more preferably less than 10 ⁇ s, Less than 1 ⁇ s is particularly preferred. This makes it possible to obtain a light-emitting device that can be turned on and off instantaneously.
- the light-emitting device of this embodiment can further include an ultraviolet light source that emits ultraviolet light having a maximum intensity within a wavelength range of 120 nm or more and less than 380 nm, preferably 250 nm or more and less than 370 nm. By doing so, the light-emitting device also has a sterilizing effect by ultraviolet rays.
- the light-emitting device of this embodiment is preferably a medical light-emitting device. That is, the light-emitting device of this embodiment capable of emitting a near-infrared light component can be a light source or illumination device for medical or biotechnology.
- the light-emitting device of the present embodiment may be a medical light-emitting device used for fluorescence imaging or photodynamic therapy, or a biotechnology light-emitting device used for examination and analysis of cells, genes, specimens, etc. can be done. Since near-infrared light components have the property of penetrating living bodies and cells, such light-emitting devices enable observation and treatment of affected areas from inside and outside the body, and use in biotechnology.
- the light-emitting device of this embodiment capable of emitting a near-infrared light component can be used as a light source for a sensing system or a lighting system for a sensing system.
- a near-infrared light component that has the property of penetrating organic matter or a near-infrared light component that is reflected by an object
- the contents or foreign matter in an organic bag or container can be It can be inspected in an unopened state.
- animals, plants, and objects including humans can be monitored by using such a light-emitting device.
- An electronic device includes the light emitting device described above.
- FIG. 9 schematically shows an example of an electronic device according to this embodiment.
- the electronic device 200 includes at least a power supply circuit 31 , a conductor 32 , and a light emitting device 100 including the wavelength converter 10 and the solid-state light source 20 .
- the power supply circuit 31 supplies power to the solid-state light source 20 in the light emitting device 100 . Also, the power supply circuit 31 supplies electrical energy to the solid-state light source 20 through the conductor 32 .
- the light emitting device 100 converts electrical energy into light energy as described above.
- the light emitting device 100 converts at least part of the electrical energy supplied from the power supply circuit 31 into light energy that becomes the output light 33 and outputs the light energy.
- the light emitting device 100 of FIG. 9 is configured to emit output light 33 including near-infrared light.
- the electronic device 200 of FIG. 9 further includes a first detector 37A and a second detector 37B.
- the first detector 37A detects the transmitted light component 35 of the output light 33 emitted from the light emitting device 100 and applied to the object 34 to be irradiated. Specifically, the first detector 37A detects near-infrared light in the transmitted light component 35 transmitted through the object 34 to be irradiated.
- the second detector 37B detects the reflected light component 36 in the output light 33 emitted from the light emitting device 100 and applied to the object 34 to be irradiated. Specifically, the second detector 37B detects near-infrared light in the reflected light component 36 reflected by the object 34 to be irradiated.
- the object to be irradiated 34 is irradiated with the output light 33 containing the near-infrared light component, and the transmitted light component 35 transmitted through the object to be irradiated 34 and the transmitted light component 35 reflected by the object to be irradiated 34
- the reflected light component 36 is detected by a first detector 37A and a second detector 37B, respectively. Therefore, the electronic device 200 can detect characteristic information of the irradiated object 34 related to the near-infrared light component.
- the light-emitting device of this embodiment can emit output light 33 that includes visible light and near-infrared light and is convenient for both human eyes and detectors. Therefore, by combining the light-emitting device with a near-infrared detector, an electronic device suitable for industrial use can be obtained.
- the light emitting device of the present embodiment can be configured so that the energy of the output light 33 is large and illuminates a wide range. Therefore, even if the object 34 is irradiated with the output light 33 from a distant distance, a signal with a good S/N ratio (signal/noise ratio) can be detected. Therefore, the electronic equipment is suitable for inspection of a large irradiated object 34, batch inspection of objects distributed over a wide range, detection of objects existing in a part of a wide inspection area, and detection of people or objects from a distance. .
- the size of the light emitting device of this embodiment will be described.
- the area of the main light extraction surface of the light emitting device 100 can be 1 cm 2 or more and less than 1 m 2 , preferably 10 cm 2 or more and less than 1000 cm 2 .
- the shortest distance from the light emitting device 100 to the irradiated object 34 is, for example, 1 mm or more and less than 10 m.
- the shortest distance from the light emitting device 100 to the object to be irradiated 34 is, for example, 1 mm or more and 30 cm. less than, preferably 3 mm or more and less than 10 cm. Furthermore, when it is necessary to inspect a wide range of the object to be irradiated 34, the shortest distance from the light emitting device 100 to the object to be irradiated 34 can be 30 cm or more and less than 10 m, preferably 1 m or more and less than 5 m.
- the light-emitting device 100 is configured to be movable, and it is more preferable to be configured so that it can be freely moved depending on the shape of the object to be illuminated.
- the light-emitting device 100 has a structure that can travel in a straight line or a curved line, a structure that can scan in the XY-axis directions or the XYZ directions, or a structure that is attached to a moving body (car, bicycle, flying body such as a drone). be able to.
- Various photodetectors can be used for the first detector 37A and the second detector 37B.
- a quantum photodetector photodiode, phototransistor, photo IC, CCD image sensor, CMOS image sensor, etc.
- a thermal photodetector thermal photodetector (thermopile using the thermoelectric effect, pyroelectric element, etc.), or an infrared film sensitive to light, etc. can also be used.
- first detector 37A and the second detector 37B a single element using a single photoelectric conversion element may be used, or an imaging element in which photoelectric conversion elements are integrated may be used.
- the form of the imaging element may be a linear one-dimensional arrangement or a two-dimensional planar arrangement. Imaging cameras can also be used as the first detector 37A and the second detector 37B.
- the electronic device 200 of FIG. 9 includes both the first detector 37A and the second detector 37B. It is sufficient to have one.
- the electronic device of this embodiment can be used as an inspection device, a detection device, a monitoring device, or a sorting device for an irradiated object by using output light.
- the near-infrared light component of the output light has the property of penetrating most substances. Therefore, by irradiating near-infrared light from the outside of the substance and detecting the transmitted light or reflected light, it is possible to inspect the internal state and the presence or absence of foreign matter without destroying the substance. can be done.
- near-infrared light components are invisible to the human eye, and their reflection characteristics depend on the material. Therefore, by irradiating an object with near-infrared light and detecting the reflected light, it is possible to detect people, animals, plants, and objects even in darkness without being noticed by people.
- the electronic device of this embodiment can inspect the internal state and the presence or absence of foreign matter without destroying the substance, determine the quality of the substance, and sort out good products from defective products. Therefore, when the electronic device is further provided with a mechanism for distinguishing between normal irradiation objects and abnormal irradiation objects, objects can be separated.
- the light emitting device 1 is not movable and can be fixed. With this configuration, it is not necessary to provide a complicated mechanism for mechanically moving the light-emitting device, so that the electronic device is less likely to malfunction. In addition, by fixing the light-emitting device indoors or outdoors, it is possible to observe the state of people and things at a predetermined place and count the number of people and things. Therefore, it is an electronic device that is advantageous for collecting big data that is useful for problem discovery and business utilization.
- the light emitting device 1 can be made movable to change the irradiation location.
- the light emitting device 1 can be attached to a moving stage or a moving object (vehicle, flying object, etc.) to make it movable.
- the light-emitting device 1 can irradiate a desired place and a wide range, so that it becomes an electronic device that is advantageous for inspection of large objects and inspection of the state of objects outdoors.
- the electronic device of this embodiment can be configured to include a hyperspectral camera as an imaging camera in addition to the light emitting device. This allows the electronic device to perform hyperspectral imaging. Electronic devices equipped with hyperspectral cameras can distinguish differences in images that cannot be distinguished with the naked eye or ordinary cameras, making them useful inspection devices in a wide range of fields related to product inspection and sorting.
- an electronic device 200A includes a light emitting device 100 and a hyperspectral camera 41. Then, while irradiating output light 44 from the light emitting device 100 to the irradiation object 43 placed on the surface 42a of the conveyor 42, the hyperspectral camera 41 captures the reflected light 45 from the irradiation object 43. . By analyzing the obtained image of the object to be irradiated 43, the object to be irradiated 43 can be inspected and sorted.
- the electronic device of this embodiment include a data processing system for machine learning in addition to the light emitting device. This will allow the computer to iteratively learn from the data it receives and discover hidden patterns in it. Also, it becomes possible to apply newly acquired data to the pattern. Therefore, it is an electronic device that is advantageous for automating inspection, detection, monitoring, etc., improving accuracy, and predicting the future using big data.
- the electronic device of this embodiment is for medical use, veterinary medical use, biotechnology use, agriculture, forestry and fisheries use, livestock industry (meat, meat products, dairy products, etc.), industrial use (foreign matter inspection, content inspection, shape inspection , packaging condition inspection, etc.).
- Electronic devices can also be used for inspection of pharmaceuticals, animal experiments, foods, beverages, agricultural, forestry and fishery products, livestock products, and industrial products.
- the electronic device of this embodiment can be used for any of the human body, animals and plants, and objects, and can also be used for any of gases, liquids, and solids.
- the electronic device of this embodiment is preferably used as a medical device, therapeutic device, beauty device, health device, care-related device, analytical device, measuring device, and evaluation device.
- the electronic device of the present embodiment can be used for 1) blood/body fluids/components thereof, 2) excrement (urine/feces), 3) proteins/amino acids, 4) cells ( (including cancer cells), 5) genes, chromosomes, nucleic acids, 6) biological samples, bacteria, specimens, antibodies, 7) biological tissues, organs, blood vessels, 8) skin diseases, alopecia, examination, detection, measurement, and evaluation of , analysis, analysis, observation, monitoring, isolation, diagnosis, treatment, purification, etc.
- the electronic device of the present embodiment can be used for 1) skin, 2) hair/body hair, 3) mouth/endodontics/periodontal, 4) ear/nose, 5) vital signs. , inspection, detection, measurement, evaluation, analysis, analysis, observation, monitoring, beautification, hygiene, growth promotion, health promotion, diagnosis, etc.
- the electronic device of the present embodiment includes: 1) industrial products (including electronic members and electronic devices), 2) agricultural products (fruits and vegetables, etc.), 3) enzymes/bacteria, 4) Marine products (fish, shellfish, crustaceans, molluscs), 5) Pharmaceuticals and biological samples, 6) Foods and beverages, 7) Presence and state of people, animals and objects, 8) State of gases (including water vapor) 9) Liquid/Fluid/Water/Humidity 10) Shape/Color/Internal Structure/Physical State of Object 11) Space/Position/Distance 12) Contamination State of Object 13) Molecule/Particle State 14) It can be used for inspection, detection, measurement, measurement, evaluation, analysis, analysis, observation, monitoring, recognition, sorting, sorting, etc. of industrial waste.
- the electronic device of the present embodiment can be used for checking excretion, identifying, managing, and monitoring health conditions.
- the electronic device of this embodiment can be used for inspection, detection, measurement, measurement, evaluation, analysis, analysis, observation, monitoring, recognition, sorting, sorting, and so on.
- the phosphor raw materials were filled into a ⁇ 13 mm mold and press-molded at a gauge pressure of about 2 MPa to obtain a plate-shaped compact made of the phosphor raw materials.
- the powder compact was placed on an alumina plate installed in a large alumina firing boat, and fired in a nitrogen atmosphere at 1500 to 1600° C. for 2 hours using a tubular atmosphere furnace. Note that the temperature rising/falling rate during firing was set to 150° C./h. Thus, a plate-like sintered body was obtained.
- a sintered body 11D made of the GLGG phosphor was obtained by mechanically polishing the top surface and the bottom surface of the sintered body with a grinder to a thickness of 300 ⁇ m.
- a plurality of recesses 11c as shown in FIG. 6(b) were formed by notching the main surface of the sintered body 11D using a dicing saw.
- the width of each concave portion 11c in the x-axis direction was set to 160 ⁇ m, and the width of each convex portion 11b was also set to 160 ⁇ m. Therefore, the average length PSm of the cross-sectional curvilinear elements in the concave-convex structure of the phosphor ceramic was set to 320 ⁇ m.
- the depth of each concave portion 11c in the y-axis direction was set to 200 ⁇ m.
- a Y 3 Al 2 (AlO 4 ) 3 :Ce 3+ phosphor (YAG phosphor) was prepared as a second phosphor.
- a YAG phosphor manufactured by Tokyo Kagaku Kenkyusho Co., Ltd. and having a median particle size D50 of about 24 ⁇ m was used.
- This YAG phosphor had a fluorescence peak near a wavelength of 540 nm and emitted yellowish green light.
- a two-liquid mixed thermosetting silicone resin manufactured by Shin-Etsu Chemical Co., Ltd., product name: KER-2500A/B was prepared as a sealing material for the YAG phosphor.
- a phosphor paste composed of YAG phosphor and silicone resin was produced.
- the content of the YAG phosphor in the phosphor paste was 30% by volume.
- the phosphor paste thus obtained was dropped on the entire concave portion 11c of the phosphor ceramic. Then, the phosphor paste was cured by heating the phosphor ceramics with the phosphor paste filled in the concave portions 11c in the air at 150° C. for 2 hours. Thus, a wavelength converter as shown in FIG. 6(c) was obtained. Further, the wavelength converter of this example as shown in FIG. 6(d) was obtained by polishing so as to remove the bottom wall portion 11f of the wavelength converter. Incidentally, the thickness t of the wavelength converter of this example was 200 ⁇ m.
- FIG. 11 shows a photograph of the obtained wavelength conversion body when viewed from above.
- GLGG phosphor particles were produced as follows. First, as shown in Table 1, phosphor raw materials were weighed. Next, 20 g of the weighed raw material was charged into an alumina pot mill having a capacity of 250 ml, and alumina balls and 60 ml of ethanol were further charged. The alumina balls had a diameter of ⁇ 3 mm and were charged in a total of 200 g. The pot mill was then mixed with a planetary ball mill at a rotational speed of 150 rpm for 30 minutes.
- a sieve was used to remove the alumina balls to obtain a slurry-like mixed raw material consisting of the raw material and ethanol. Thereafter, the slurry mixed raw material was entirely dried at 125° C. using a dryer. The dried mixed raw material was lightly mixed with a mortar and pestle to obtain a phosphor raw material.
- the phosphor raw material was placed in an alumina firing container (material SSA-H, B3 size, with lid) and fired in the air at 1500°C for 2 hours using a box-type electric furnace. Note that the temperature rising/falling rate during firing was set to 300° C./h.
- the obtained baked product was manually pulverized using an alumina mortar and pestle, and then passed through a nylon mesh (95 ⁇ m opening) to remove coarse particles.
- a powdery GLGG phosphor represented by the composition formula (Gd 0.95 La 0.05 ) 3 (Ga 0.97 Cr 0.03 ) 2 (GaO 4 ) 3 was obtained.
- a first phosphor sheet was produced. Specifically, first, the silicone resin and the GLGG phosphor were weighed so that the filling rate of the GLGG phosphor powder in the resin was 30% by volume. In addition, the same silicone resin as in the example was used. Next, the silicone resin and the phosphor powder were mixed using a mortar and pestle. Then, the resulting mixture was evacuated (degassed) to obtain a phosphor paste.
- the phosphor paste was dropped onto the glass substrate, and the surface was smoothed using a squeegee. Then, the phosphor paste was cured by heating in the air at 150° C. for 2 hours to obtain a first phosphor sheet. The thickness of the first phosphor sheet was set to 100 ⁇ m.
- a second phosphor sheet was produced using the same YAG phosphor as in the example. Specifically, first, the silicone resin and the YAG phosphor were weighed so that the filling rate of the YAG phosphor powder in the resin was 30% by volume. In addition, the same silicone resin as in the example was used. Next, the silicone resin and the phosphor powder were mixed using a mortar and pestle. Then, the resulting mixture was evacuated (degassed) to obtain a phosphor paste.
- the phosphor paste was dropped onto the glass substrate, and the surface was smoothed using a squeegee. Then, the phosphor paste was cured by heating in the air at 150° C. for 2 hours to obtain a second phosphor sheet. The thickness of the second phosphor sheet was set to 100 ⁇ m.
- the obtained first phosphor sheet 51 and second phosphor sheet 52 were superimposed to obtain the wavelength converter of this example.
- the thickness of the wavelength converter of this example was 200 ⁇ m.
- the wavelength converters of Examples and Comparative Examples were irradiated with laser light, and the radiant flux and spectral distribution of the output light emitted from the wavelength converters were measured. Specifically, after irradiating the main surface of the wavelength converters of Examples and Comparative Examples with laser light, the output light emitted from the wavelength converters was applied to an integrating sphere ( ⁇ 20 inches, product number: LMS-200, manufactured by Labsphere ). Then, the radiant flux and spectral distribution of the output light were measured using a total luminous flux measurement system (product number: SLMS-CDS-2021, manufactured by Labsphere).
- the laser light was blue light with a wavelength of 450 nm, and the outputs were 0.5 W, 1.0 W, 1.5 W, 2.0 W, 2.5 W, and 3.0 W. Also, the wavelength converter of the comparative example was irradiated with laser light from the second phosphor sheet side in which the YAG phosphor was dispersed.
- FIG. 13 shows the relationship between the output of laser light and the output (radiant flux) of fluorescence emitted from the wavelength converters for the wavelength converters of Examples and Comparative Examples.
- the output from the wavelength converters tended to increase as the laser light output increased.
- the laser beam output was 3 W
- the output from the wavelength converter decreased, but this was because the silicone resin in the phosphor section was burnt and turned black.
- the output from the wavelength converter of the comparative example also tended to increase as the output of laser light increased.
- the silicone resin was scorched and turned black, resulting in a decrease in the output from the wavelength converter.
- the wavelength converters of Examples have a higher emitted fluorescence output than Comparative Examples. Moreover, it can be seen that the wavelength converters of Examples have higher heat dissipation and superior heat resistance than those of Comparative Examples.
- FIG. 14 shows the relationship between the output of the laser light and the spectral distribution of the output light emitted from the wavelength converter when the wavelength converter of the example is irradiated with laser light.
- FIG. 15 shows the relationship between the output of the laser light and the spectral distribution of the output light emitted from the wavelength conversion body when the wavelength conversion body of the comparative example is irradiated with the laser light.
- the wavelength converter of Example gave a spectral distribution having emission peaks near a wavelength of 550 nm and near a wavelength of 740 nm. Therefore, it turns out that the wavelength converter of an Example can radiate both green light and near-infrared light with high efficiency. Also, it can be seen that both the green light and the near-infrared light can be emitted with high efficiency even if the output of the laser light is increased from 0.5 W to 2.5 W.
- the wavelength conversion body of the comparative example has a strong emission peak near the wavelength of 550 nm, but the emission peak near the wavelength of 740 nm is significantly lower than that of the example.
- the YAG phosphor absorbs a large amount of the laser light, resulting in insufficient absorption by the GLGG phosphor. Also, it can be seen that when the output of the laser light is increased from 0.5 W to 1.5 W, the intensity of the green light is improved, but the intensity of the near-infrared light is not greatly improved.
- the wavelength converters of the examples can radiate both fluorescence due to parity-forbidden transitions and fluorescence due to parity-allowed transitions with high efficiency without using a rotary drive device.
- the present disclosure it is possible to provide a wavelength converter capable of increasing the luminous efficiency of phosphors and a light-emitting device using the wavelength converter without using a rotation drive device.
- Reference Signs List 10 10A, 10B, 10C wavelength converter 11, 11A, 11B, 11C phosphor ceramics 11a main surface of phosphor ceramics 11b convex portion 11c concave portion 12, 12B, 12C phosphor portion 20 solid-state light source 100, 100A light emitting device
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Ceramic Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Hardware Design (AREA)
- Inorganic Chemistry (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Structural Engineering (AREA)
- Multimedia (AREA)
- Semiconductor Lasers (AREA)
- Luminescent Compositions (AREA)
Abstract
Description
本実施形態に係る波長変換体10は、図3及び図4に示すように、蛍光体セラミックス11と、蛍光体部12とを備えている。蛍光体セラミックス11の主表面11aには、複数の凸部11bが形成されており、隣り合う凸部11bの間には凹部11cが形成されている。そして、蛍光体セラミックス11における複数の凹部11cの内部には、蛍光体部12が配置されている。
次に、本実施形態に係る発光装置について説明する。本実施形態の発光装置100は、図7に示すように、上述の波長変換体10と、波長変換体10に照射される光(励起光、一次光L)を放射する固体光源20とを備えている。このような固体光源20としては、400nm以上500nm未満、好ましくは440nm以上480nm未満の波長範囲内に発光ピークを持つ一次光Lを放つ固体発光素子を使用することができる。
次に、本実施形態に係る電子機器について説明する。本実施形態に係る電子機器は、上述の発光装置を備えている。図9では、本実施形態に係る電子機器の一例を概略的に示している。電子機器200は、電源回路31と、導体32と、波長変換体10及び固体光源20を備える発光装置100と、を少なくとも備えている。
(実施例)
まず、化学反応によってCr3+で付活された複合金属酸化物からなる第一の蛍光体を生成するように、表1に示す原料を秤量した。なお、Cr3+で付活された複合金属酸化物は、(Gd0.95La0.05)3(Ga0.97Cr0.03)2(GaO4)3の組成式で表され、ガーネット型の結晶構造を持つ(Gd,La)3Ga2(GaO4)3:Cr3+蛍光体とした。以後、(Gd,La)3Ga2(GaO4)3:Cr3+蛍光体をGLGG蛍光体ともいう。また、表1に示す原料は、次のものを使用した。
酸化ガドリニウム(Gd2O3):純度3N、日本イットリウム株式会社製
水酸化ランタン(La(OH)3):純度3N、信越化学工業株式会社製
酸化ガリウム(Ga2O3):純度4N、アジア物性材料株式会社製
酸化クロム(Cr2O3):純度3N、株式会社高純度化学研究所製
まず、次のようにして、GLGG蛍光体の粒子を作製した。最初に、表1に示すように蛍光体原料を秤量した。次いで、秤量した原料20gを、容量250mlであるアルミナ製のポットミルに投入し、さらにアルミナボール及びエタノール60mlを投入した。アルミナボールは、直径φ3mmであり、合計200g投入した。そして、ポットミルを、遊星ボールミルを用いて回転速度150rpmで30分間混合した。
実施例及び比較例の波長変換体にレーザー光を照射し、波長変換体から放射される出力光の放射束及び分光分布を測定した。具体的には、実施例及び比較例の波長変換体の主表面にレーザー光を照射した後、波長変換体から放射された出力光を積分球(φ20インチ、品番:LMS-200、Labsphere社製)で積分した。そして、全光束測定システム(品番:SLMS-CDS-2021、Labsphere社製)を用いて、出力光の放射束及び分光分布を測定した。なお、レーザー光は波長450nmの青色光とし、出力は0.5W,1.0W,1.5W,2.0W,2.5W、3.0Wとした。また、比較例の波長変換体は、YAG蛍光体が分散した第二の蛍光体シート側からレーザー光を照射した。
11,11A,11B,11C 蛍光体セラミックス
11a 蛍光体セラミックスの主表面
11b 凸部
11c 凹部
12,12B,12C 蛍光体部
20 固体光源
100,100A 発光装置
Claims (9)
- パリティー禁制遷移による蛍光を放射する第一の蛍光体を含有する蛍光体セラミックスと、
パリティー許容遷移による蛍光を放射する第二の蛍光体を含有する蛍光体部と、
を備え、
前記蛍光体セラミックスの主表面は、複数の凸部及び複数の凹部からなる凹凸構造を有しており、
前記蛍光体セラミックスにおける複数の前記凹部の内部には、前記蛍光体部が配置されている、波長変換体。 - 前記蛍光体部が前記凹部の内部に配置されていない前記蛍光体セラミックスにおいて、前記凹凸構造における断面曲線要素の平均長さPSmは400μm以下である、請求項1に記載の波長変換体。
- 前記第一の蛍光体は、発光中心元素としてCrを含み、700nm以上1600nm未満の波長範囲内に発光ピークを持つ蛍光体である、請求項1又は2に記載の波長変換体。
- 前記第二の蛍光体は、発光中心元素としてCeを含み、500nm以上600nm未満の波長範囲内に発光ピークを持つ蛍光体である、請求項1から3のいずれか一項に記載の波長変換体。
- 平面視した場合、前記蛍光体セラミックスと前記蛍光体部とが交互に積層されている、請求項1から4のいずれか一項に記載の波長変換体。
- 平面視した場合、前記蛍光体部が前記蛍光体セラミックスを介して分離して配置されている、又は、前記蛍光体セラミックスが前記蛍光体部を介して分離して配置されている、請求項1から4のいずれか一項に記載の波長変換体。
- 前記蛍光体セラミックスの熱伝導率は、前記蛍光体部の熱伝導率よりも大きい、請求項1から6のいずれか一項に記載の波長変換体。
- 前記蛍光体部は、600nm以上700nm未満の波長範囲内に発光ピークを持つ第三の蛍光体をさらに含有する、請求項1から7のいずれか一項に記載の波長変換体。
- 請求項1から8のいずれか一項に記載の波長変換体と、
前記波長変換体に照射され、かつ、400nm以上500nm未満の波長範囲内に発光ピークを持つ光を放射する固体光源と、
を備える、発光装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP22755918.4A EP4296731A1 (en) | 2021-02-18 | 2022-02-01 | Wavelength converter and light emitting device provided therewith |
JP2023500695A JPWO2022176597A1 (ja) | 2021-02-18 | 2022-02-01 | |
CN202280013194.1A CN116848440A (zh) | 2021-02-18 | 2022-02-01 | 波长转换体以及使用了该波长转换体的发光装置 |
US18/275,863 US20240128413A1 (en) | 2021-02-18 | 2022-02-01 | Wavelength converter and light emitting device provided therewith |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021024564 | 2021-02-18 | ||
JP2021-024564 | 2021-02-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022176597A1 true WO2022176597A1 (ja) | 2022-08-25 |
Family
ID=82932026
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2022/003779 WO2022176597A1 (ja) | 2021-02-18 | 2022-02-01 | 波長変換体及びそれを用いた発光装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20240128413A1 (ja) |
EP (1) | EP4296731A1 (ja) |
JP (1) | JPWO2022176597A1 (ja) |
CN (1) | CN116848440A (ja) |
WO (1) | WO2022176597A1 (ja) |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013197395A (ja) * | 2012-03-21 | 2013-09-30 | Casio Comput Co Ltd | 蛍光体デバイス、照明装置及びプロジェクタ装置 |
JP2016161709A (ja) | 2015-02-27 | 2016-09-05 | 日亜化学工業株式会社 | 光源装置及び光源装置を備えたプロジェクタ |
WO2018084282A1 (ja) * | 2016-11-07 | 2018-05-11 | 富士フイルム株式会社 | 蛍光体含有フィルムおよびバックライトユニット |
WO2018230207A1 (ja) * | 2017-06-15 | 2018-12-20 | パナソニックIpマネジメント株式会社 | ガーネット珪酸塩、ガーネット珪酸塩蛍光体、並びにガーネット珪酸塩蛍光体を用いた波長変換体及び発光装置 |
JP2019179920A (ja) * | 2015-10-28 | 2019-10-17 | パナソニックIpマネジメント株式会社 | 発光装置 |
JP2020052234A (ja) * | 2018-09-27 | 2020-04-02 | 日亜化学工業株式会社 | 波長変換部材複合体、発光装置及び波長変換部材複合体の製造方法 |
JP2020166012A (ja) * | 2019-03-28 | 2020-10-08 | パナソニックIpマネジメント株式会社 | 波長変換部材、光源装置、及び照明装置 |
JP2021024564A (ja) | 2019-07-30 | 2021-02-22 | ツェット・エフ・フリードリヒスハーフェン・アクチェンゲゼルシャフト | 作動可能な保護デバイスを制御する、改善された区別の方法及び装置 |
-
2022
- 2022-02-01 WO PCT/JP2022/003779 patent/WO2022176597A1/ja active Application Filing
- 2022-02-01 JP JP2023500695A patent/JPWO2022176597A1/ja active Pending
- 2022-02-01 CN CN202280013194.1A patent/CN116848440A/zh active Pending
- 2022-02-01 US US18/275,863 patent/US20240128413A1/en active Pending
- 2022-02-01 EP EP22755918.4A patent/EP4296731A1/en active Pending
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013197395A (ja) * | 2012-03-21 | 2013-09-30 | Casio Comput Co Ltd | 蛍光体デバイス、照明装置及びプロジェクタ装置 |
JP2016161709A (ja) | 2015-02-27 | 2016-09-05 | 日亜化学工業株式会社 | 光源装置及び光源装置を備えたプロジェクタ |
JP2019179920A (ja) * | 2015-10-28 | 2019-10-17 | パナソニックIpマネジメント株式会社 | 発光装置 |
WO2018084282A1 (ja) * | 2016-11-07 | 2018-05-11 | 富士フイルム株式会社 | 蛍光体含有フィルムおよびバックライトユニット |
WO2018230207A1 (ja) * | 2017-06-15 | 2018-12-20 | パナソニックIpマネジメント株式会社 | ガーネット珪酸塩、ガーネット珪酸塩蛍光体、並びにガーネット珪酸塩蛍光体を用いた波長変換体及び発光装置 |
JP2020052234A (ja) * | 2018-09-27 | 2020-04-02 | 日亜化学工業株式会社 | 波長変換部材複合体、発光装置及び波長変換部材複合体の製造方法 |
JP2020166012A (ja) * | 2019-03-28 | 2020-10-08 | パナソニックIpマネジメント株式会社 | 波長変換部材、光源装置、及び照明装置 |
JP2021024564A (ja) | 2019-07-30 | 2021-02-22 | ツェット・エフ・フリードリヒスハーフェン・アクチェンゲゼルシャフト | 作動可能な保護デバイスを制御する、改善された区別の方法及び装置 |
Also Published As
Publication number | Publication date |
---|---|
EP4296731A1 (en) | 2023-12-27 |
US20240128413A1 (en) | 2024-04-18 |
JPWO2022176597A1 (ja) | 2022-08-25 |
CN116848440A (zh) | 2023-10-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6964270B2 (ja) | 内視鏡用発光装置及びそれを用いた内視鏡、並びに蛍光イメージング方法 | |
JP6851036B2 (ja) | 発光装置、電子機器及び発光装置の使用方法 | |
WO2020217669A1 (ja) | 発光装置並びにそれを用いた医療システム、電子機器及び検査方法 | |
JP7361347B2 (ja) | 波長変換体、並びにそれを用いた発光装置、医療システム、電子機器及び検査方法 | |
JP7361346B2 (ja) | 発光装置並びにそれを用いた医療システム、電子機器及び検査方法 | |
JP7445866B2 (ja) | 発光装置及びそれを用いた電子機器 | |
WO2022176597A1 (ja) | 波長変換体及びそれを用いた発光装置 | |
US11692687B2 (en) | Wavelength converting composite member, and light emitting device and electronic instrument employing same | |
WO2022176782A1 (ja) | 発光装置及びそれを用いた電子機器 | |
EP4300606A1 (en) | Light emitting device and electronic apparatus using same | |
WO2023008028A1 (ja) | 発光装置及び電子機器 | |
JP7296563B2 (ja) | 発光装置並びにそれを用いた電子機器及び検査方法 | |
WO2020235369A1 (ja) | 発光装置並びにそれを用いた電子機器及び検査方法 | |
WO2021261251A1 (ja) | 発光装置及びこれを用いた電子機器 | |
WO2022176596A1 (ja) | 検査装置及び検査方法 | |
CN113227321B (zh) | 发光装置、电子设备以及发光装置的使用方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22755918 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2023500695 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 202280013194.1 Country of ref document: CN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 18275863 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2022755918 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 2022755918 Country of ref document: EP Effective date: 20230918 |