WO2021200287A1 - 蛍光体粉末、複合体、発光装置および蛍光体粉末の製造方法 - Google Patents
蛍光体粉末、複合体、発光装置および蛍光体粉末の製造方法 Download PDFInfo
- Publication number
- WO2021200287A1 WO2021200287A1 PCT/JP2021/011488 JP2021011488W WO2021200287A1 WO 2021200287 A1 WO2021200287 A1 WO 2021200287A1 JP 2021011488 W JP2021011488 W JP 2021011488W WO 2021200287 A1 WO2021200287 A1 WO 2021200287A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- powder
- phosphor
- less
- fluorescent powder
- phosphor powder
- Prior art date
Links
- 239000000843 powder Substances 0.000 title claims abstract description 96
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 238000004519 manufacturing process Methods 0.000 title claims description 23
- 238000002189 fluorescence spectrum Methods 0.000 claims abstract description 26
- 230000005284 excitation Effects 0.000 claims abstract description 14
- 229910000789 Aluminium-silicon alloy Inorganic materials 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims description 49
- 239000002994 raw material Substances 0.000 claims description 34
- 238000010304 firing Methods 0.000 claims description 27
- 238000000137 annealing Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 21
- 229910052693 Europium Inorganic materials 0.000 claims description 14
- 238000010306 acid treatment Methods 0.000 claims description 14
- 239000011812 mixed powder Substances 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 14
- 239000007858 starting material Substances 0.000 claims description 12
- 239000003566 sealing material Substances 0.000 claims description 6
- 238000001354 calcination Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000013078 crystal Substances 0.000 abstract description 15
- 239000011575 calcium Substances 0.000 description 23
- 230000000052 comparative effect Effects 0.000 description 15
- 238000010438 heat treatment Methods 0.000 description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 11
- 239000000203 mixture Substances 0.000 description 11
- OGPBJKLSAFTDLK-UHFFFAOYSA-N europium atom Chemical compound [Eu] OGPBJKLSAFTDLK-UHFFFAOYSA-N 0.000 description 10
- 239000000126 substance Substances 0.000 description 8
- 239000012298 atmosphere Substances 0.000 description 7
- 229910001873 dinitrogen Inorganic materials 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- -1 strontium nitride Chemical class 0.000 description 7
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 229910052712 strontium Inorganic materials 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 238000004904 shortening Methods 0.000 description 5
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 5
- 229910052721 tungsten Inorganic materials 0.000 description 5
- 239000010937 tungsten Substances 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052791 calcium Inorganic materials 0.000 description 4
- 229910001940 europium oxide Inorganic materials 0.000 description 4
- AEBZCFFCDTZXHP-UHFFFAOYSA-N europium(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Eu+3].[Eu+3] AEBZCFFCDTZXHP-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 3
- 150000002178 europium compounds Chemical class 0.000 description 3
- 229910017604 nitric acid Inorganic materials 0.000 description 3
- 239000012299 nitrogen atmosphere Substances 0.000 description 3
- 238000000634 powder X-ray diffraction Methods 0.000 description 3
- 238000010298 pulverizing process Methods 0.000 description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000000295 emission spectrum Methods 0.000 description 2
- 239000008393 encapsulating agent Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000007561 laser diffraction method Methods 0.000 description 2
- 230000031700 light absorption Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000003870 refractory metal Substances 0.000 description 2
- 238000000790 scattering method Methods 0.000 description 2
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 2
- 150000003438 strontium compounds Chemical class 0.000 description 2
- 229910052715 tantalum Inorganic materials 0.000 description 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- PSBUJOCDKOWAGJ-UHFFFAOYSA-N azanylidyneeuropium Chemical compound [Eu]#N PSBUJOCDKOWAGJ-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229940043430 calcium compound Drugs 0.000 description 1
- 150000001674 calcium compounds Chemical class 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000007580 dry-mixing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000012442 inert solvent Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000001443 photoexcitation Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- PYWVYCXTNDRMGF-UHFFFAOYSA-N rhodamine B Chemical compound [Cl-].C=12C=CC(=[N+](CC)CC)C=C2OC2=CC(N(CC)CC)=CC=C2C=1C1=CC=CC=C1C(O)=O PYWVYCXTNDRMGF-UHFFFAOYSA-N 0.000 description 1
- 229940043267 rhodamine b Drugs 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- HPNURIVGONRLQI-UHFFFAOYSA-K trifluoroeuropium Chemical compound F[Eu](F)F HPNURIVGONRLQI-UHFFFAOYSA-K 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
-
- 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
- C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
- C09K11/77348—Silicon Aluminium Nitrides or Silicon Aluminium Oxynitrides
-
- 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
- C09K11/64—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing aluminium
-
- 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
- C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
- C09K11/7734—Aluminates
-
- 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
- C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
-
- 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
- C09K11/0883—Arsenides; Nitrides; Phosphides
-
- 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
- C09K11/59—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing silicon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2933/00—Details relating to devices covered by the group H01L33/00 but not provided for in its subgroups
- H01L2933/0008—Processes
- H01L2933/0033—Processes relating to semiconductor body packages
- H01L2933/0041—Processes relating to semiconductor body packages relating to wavelength conversion elements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Definitions
- the present invention relates to a fluorescent substance powder, a complex, a light emitting device, and a method for producing a fluorescent substance powder.
- Patent Document 1 includes a general formula M a Sr b Ca c Al d Si e N crystal phase represented by f, the quantum efficiency retention rate at 4000 mW / mm 2 photoexcitation is 85% A phosphor characterized by the above is described.
- the present invention has been made in view of such circumstances.
- One of the objects of the present invention is to improve the brightness of the white LED by improving the red phosphor.
- the peak wavelength of the fluorescence spectrum when irradiated with blue excitation light having a wavelength of 455 nm is 600 nm or more and 610 nm or less.
- a composite comprising the above-mentioned fluorescent powder and a sealing material for sealing the fluorescent powder is provided.
- a light emitting device including a light emitting element that emits excitation light and the above-mentioned complex that converts the wavelength of the excitation light is provided.
- the above-mentioned method for producing a fluorescent powder A mixing process in which the starting materials are mixed to form a raw material mixed powder, A firing step of calcining the raw material mixed powder to obtain a calcined product, and Including Provided is a method for producing a phosphor powder, wherein the starting material contains SCASSN phosphor nucleus particles having an average particle size of 5 ⁇ m or more and 30 ⁇ m or less.
- the brightness of the white LED can be improved.
- luminance is a physical quantity (unit: cd / m 2 ) defined by using the luminous intensity of the light source and the angle facing the light source surface.
- luminance is a physical quantity (unit: cd / m 2 ) defined by using the luminous intensity of the light source and the angle facing the light source surface.
- brightness as used herein is used in a broader sense.
- the term “brightness” as used herein includes meanings such as “the degree of light brightness felt by humans” and “sensory light intensity in consideration of the luminosity factor of the human eye”.
- Phosphor powder in this embodiment is made of a red phosphor represented by general formula (Sr x, Ca 1-x -y, Eu y) AlSi (N, O) 3 having the same crystalline phase and CASN.
- the peak wavelength of the fluorescence spectrum when the phosphor powder of the present embodiment is irradiated with blue excitation light having a wavelength of 455 nm is 600 nm or more and 610 nm or less, preferably 602 nm or more and 609 nm or less.
- the full width at half maximum of this fluorescence spectrum is 73 nm or less, preferably 70 nm or more and 73 nm or less, and more preferably 71 nm or more and 73 nm or less.
- the brightness of the white LED by improving the red phosphor it is conceivable to simply increase the peak intensity itself of the emission spectrum of the red phosphor.
- the brightness can be improved by shortening the peak "wavelength" of the emission (fluorescence) spectrum due to the relationship of visual sensitivity. That is, in the wavelength region of red light, humans tend to feel "brighter” in short wavelength light than in long wavelength light.
- the red phosphor represented by the general formula (Sr x , Ca 1-xy , Eu y ) AlSi (N, O) 3 having the same crystal phase as CASN
- the phosphor was designed so that the peak wavelength of the fluorescence spectrum when irradiated with blue excitation light having a wavelength of 455 nm was 600 nm or more and 610 nm or less. By this "shortening of the peak wavelength", the brightness of the white LED can be improved.
- the peak wavelength of the red phosphor is designed to be shortened, the peak intensity may decrease, but in the present embodiment, half of the fluorescence spectrum is used.
- the red phosphor so that the value range is 73 nm or less, the peak intensity of the fluorescence spectrum is increased (the peak top is not decreased).
- the phosphor particles of the present embodiment, in which the peak wavelength of the fluorescence spectrum is a short wavelength and the half width of the fluorescence spectrum is small, are preferably used for improving the brightness of the white LED.
- the fluorescent powder of the present embodiment can be obtained by appropriately selecting raw materials, usage ratio of each raw material, manufacturing procedure, manufacturing conditions, and the like. Regarding the selection of raw materials and the amount ratio of raw materials, it is preferable to use a large amount of Sr-containing raw materials, use a small amount of Eu-containing raw materials, add a “nucleus” described later, and the like. As for the manufacturing procedure and manufacturing conditions, it is preferable to perform firing using a container made of a refractory metal, for example, a container made of tungsten, molybdenum, or tantalum. These details will be described later.
- the crystal phase can be confirmed by powder X-ray diffraction.
- the crystal phase is preferably a single phase of a crystal, but may contain a heterogeneous phase as long as it does not significantly affect the characteristics of the phosphor.
- the presence or absence of a heterogeneous phase can be determined by, for example, powder X-ray diffraction by the presence or absence of a peak other than that due to the target crystal phase.
- Skeletal structure of CASN is, (Si, Al) -N 4 tetrahedra are constituted by bonding, Ca atoms in the gaps of the skeleton is obtained by position. A part of Ca 2+ is replaced with Eu 2+, which acts as a light emitting center, to form a red phosphor.
- x it is preferably 0.9 ⁇ x ⁇ 1, more preferably 0.92 ⁇ x ⁇ 1, and even more preferably 0.95 ⁇ x ⁇ 1.
- the molar ratio of Sr / (Sr + Ca) is preferably 0.96 or more and 0.999 or less, and more preferably 0.97 or more and 0.999 or less.
- y it is preferably y ⁇ 0.01, more preferably 0.0005 ⁇ y ⁇ 0.005, and even more preferably 0.001 ⁇ y ⁇ 0.005.
- the phosphor particles contain a certain amount of Eu, but from the viewpoint of shortening the wavelength, the amount of Eu is preferably relatively small in the present embodiment.
- the median diameter of the phosphor particles of the present embodiment is preferably 1 ⁇ m or more and 40 ⁇ m or less, and more preferably 10 ⁇ m or more and 30 ⁇ m or less. In an application for converting blue light from a blue LED into red light, a median diameter of this degree is preferable in terms of a balance of various performances such as brightness and conversion efficiency.
- the median diameter can be measured as a volume-based value by the laser diffraction / scattering method. The median diameter can be adjusted by appropriately applying known means such as pulverization and sieving. Details will be described later.
- the fluorescent powder of the present embodiment can be obtained by appropriately selecting raw materials, usage ratios of each raw material, manufacturing procedure, manufacturing conditions, and the like.
- the fluorescent powder of the present embodiment is preferably ⁇ A mixing process in which the starting materials are mixed to form a raw material mixed powder, ⁇ A firing process in which the raw material mixed powder is fired to obtain a fired product, It can be manufactured by passing through.
- the starting raw materials are mixed to obtain a raw material mixed powder.
- the starting material include a europium compound, a strontium compound such as strontium nitride, a calcium compound such as calcium nitride, silicon nitride, and aluminum nitride.
- the form of each starting material is preferably powdery.
- Examples of the europium compound include oxides containing europium, hydroxides containing europium, nitrides containing europium, oxynitrides containing europium, halides containing europium, and the like. These can be used alone or in combination of two or more. Among these, it is preferable to use europium oxide, europium nitride, and europium fluoride alone, and it is more preferable to use europium oxide alone.
- europium is divided into those that dissolve in solid solution, those that volatilize, and those that remain as heterogeneous components.
- the heterophase component containing europium can be removed by acid treatment or the like. However, if it is produced in an excessively large amount, an insoluble component is generated by the acid treatment, and the brightness is lowered. Further, as long as it is a different phase that does not absorb excess light, it may be in a residual state, and europium may be contained in this different phase.
- the amount of the europium compound used is not limited, but assuming that the charging ratio is directly reflected in the final composition ratio, y in the above general formula is y ⁇ 0.01, more preferably 0.0005. It is preferably used in an amount such that ⁇ y ⁇ 0.005, more preferably 0.001 ⁇ y ⁇ 0.005.
- y in the above inequality does not include the amount of europium in the nuclear particles. In terms of shortening the wavelength, it is preferable that the amount of europium is relatively small in this embodiment.
- x in the above general formula is 0.9 ⁇ x ⁇ 1, more preferably 0.92. It is preferably used in an amount such that ⁇ x ⁇ 1, more preferably 0.95 ⁇ x ⁇ 1.
- x in the above inequality does not include the amount of strontium in the nuclear particles. In terms of shortening the wavelength, it is preferable that the amount of strontium is relatively large in this embodiment.
- the starting material preferably contains SCASN phosphor nuclei particles having a median diameter of 5 ⁇ m or more and 30 ⁇ m or less. That is, it is preferable that a part of the starting material is SCASN phosphor nucleus particles having an average particle size of 5 ⁇ m or more and 30 ⁇ m or less. The average particle size is more preferably 10 ⁇ m or more and 20 ⁇ m or less.
- the SCASSN phosphor nucleus particles are also simply referred to as "nuclear particles", "nuclei” and the like.
- the method of crystal growth differs from the case where the firing process is performed without using the nuclei (for example, by using the nuclei, the composition of each particle is compared with the case where the nuclei are not used. It is thought that it will be easier to align). Then, probably as a result, it is considered that it becomes easy to obtain a phosphor powder in which the peak wavelength of the fluorescence spectrum when irradiated with blue excitation light having a wavelength of 455 nm is 600 nm or more and 610 nm or less, and the half width of the fluorescence spectrum is 73 nm or less. ..
- the nuclear particle can be a red phosphor represented by the same general formula as the red phosphor of the present embodiment described above.
- the peak wavelength of the fluorescence spectrum when irradiated with blue excitation light having a wavelength of 455 nm is not necessarily 600 nm or more and 610 nm or less, and / or the half width of the fluorescence spectrum is not 73 nm or less.
- the composition is the same as or similar to that of the red phosphor of the present embodiment.
- the amount thereof is, for example, 1% by mass or more and 20% by mass or less, preferably 2% by mass or more and 15% by mass or less, based on the total amount of the raw material mixed powder.
- Nuclear particles can be obtained, for example, by undergoing a process substantially similar to that of the phosphor powder of the present embodiment. That is, in the process for producing the fluorescent powder of the present embodiment, the nuclear particles can be obtained in substantially the same manner except that the nuclear particles are not added in the mixing step.
- the composition of the nuclear particles (general formula) is also preferably the same as that of the phosphor powder of the present embodiment.
- the raw material mixed powder can be obtained by, for example, a method of dry mixing the starting materials, a method of wet mixing in an inert solvent that does not substantially react with each starting material, and then removing the solvent.
- a method of dry mixing the starting materials for example, a method of wet mixing in an inert solvent that does not substantially react with each starting material, and then removing the solvent.
- the mixing device for example, a small mill mixer, a V-type mixer, a locking mixer, a ball mill, a vibration mill and the like can be used.
- the raw material mixed powder can be obtained by removing the agglomerates with a sieve if necessary.
- the mixing step is preferably carried out in a nitrogen atmosphere or in an environment where the water content (humidity) is as low as possible.
- the firing temperature in the firing step is preferably 1800 ° C. or higher and 2100 ° C. or lower, and more preferably 1900 ° C. or higher and 2000 ° C. or lower.
- the firing temperature is at least the above lower limit value, the grain growth of the phosphor particles proceeds more effectively. Therefore, the light absorption rate, the internal quantum efficiency, and the external quantum efficiency can be further improved.
- the firing temperature is not more than the above upper limit value, the decomposition of the phosphor particles can be further suppressed. Therefore, the light absorption rate, the internal quantum efficiency, and the external quantum efficiency can be further improved.
- the heating time, the heating rate, the heating holding time, and the pressure in the firing step are not particularly limited, and may be appropriately adjusted according to the raw materials used.
- the heating holding time is preferably 3 hours or more and 30 hours or less
- the pressure is preferably 0.6 MPa or more and 10 MPa or less (gauge pressure).
- the firing step is performed in a nitrogen gas atmosphere. That is, the firing step is preferably performed in a nitrogen gas atmosphere having a pressure of 0.6 MPa or more and 10 MPa or less (gauge pressure).
- a container that does not easily react with the mixture during firing for example, a container made of refractory metal, specifically a container whose inner wall is made of tungsten, molybdenum or tantalum, and heat the mixture.
- a container made of refractory metal specifically a container whose inner wall is made of tungsten, molybdenum or tantalum
- a powdering step may be performed.
- the calcined product obtained through the calcining step is usually a granular or massive sintered body.
- the fired product can be once powdered to obtain a sintered powder by using treatments such as crushing, crushing, and classification alone or in combination.
- Specific treatment methods include, for example, a method of pulverizing a sintered body to a predetermined particle size using a general pulverizer such as a ball mill, a vibration mill, or a jet mill.
- a general pulverizer such as a ball mill, a vibration mill, or a jet mill.
- excessive pulverization may generate fine particles that easily scatter light, or may cause crystal defects on the particle surface, resulting in a decrease in luminous efficiency.
- an annealing step may be performed. Specifically, after the firing step, there may be an annealing step of annealing the firing powder at a temperature lower than the firing temperature in the firing step to obtain an annealing powder.
- the annealing step is performed by an inert gas such as a rare gas or nitrogen gas, a reducing gas such as hydrogen gas, carbon monoxide gas, hydrocarbon gas or ammonia gas, a mixed gas thereof, or a non-pure nitrogen other than pure nitrogen such as in a vacuum. It is preferable to carry out in an oxidizing atmosphere. Particularly preferably, it is carried out in a hydrogen gas atmosphere or an argon atmosphere.
- the annealing step may be performed under atmospheric pressure, pressurization, or depressurization.
- the heat treatment temperature in the annealing step is preferably 1300 ° C. or higher and 1400 ° C. or lower.
- the time of the annealing step is not particularly limited, but is preferably 3 hours or more and 12 hours or less, and more preferably 5 hours or more and 10 hours or less.
- an acid treatment step may be performed.
- the annealing powder obtained in the annealing step is usually acid-treated. Thereby, at least a part of impurities that do not contribute to light emission can be removed. By the way, it is presumed that impurities that do not contribute to light emission are generated during the firing step and the annealing step.
- an aqueous solution containing one or more acids selected from hydrofluoric acid, sulfuric acid, phosphoric acid, hydrochloric acid, and nitric acid can be used.
- hydrofluoric acid, nitric acid, and a mixed acid of hydrofluoric acid and nitric acid are preferable.
- the acid treatment can be carried out by dispersing the annealing powder in the above-mentioned aqueous solution containing an acid.
- the stirring time is, for example, 10 minutes or more and 6 hours or less, preferably 30 minutes or more and 3 hours or less.
- the temperature at the time of stirring can be, for example, 40 ° C. or higher and 90 ° C. or lower, preferably 50 ° C.
- the liquid in which the annealing powder is dispersed may be boiled.
- substances other than the fluorescent substance powder may be separated by filtration, and if necessary, the substances attached to the fluorescent substance particles may be washed with water.
- the fluorescent powder is usually dried by natural drying or drying in a dryer. You may put the dried fluorescent powder in a crucible and heat it to modify the surface.
- the fluorescent powder of the present embodiment can be obtained by the series of steps as described above.
- the complex includes, for example, the above-mentioned fluorescent powder and a sealing material for sealing the fluorescent powder.
- the above-mentioned fluorescent powder is dispersed in the encapsulant.
- the sealing material a well-known material such as resin, glass, or ceramics can be used.
- the resin used for the sealing material include transparent resins such as silicone resin, epoxy resin, and urethane resin.
- a method for producing the complex a method in which the fluorescent powder according to the embodiment is added to a liquid resin, glass, ceramics or the like, mixed uniformly, and then cured or sintered by heat treatment is used. Can be mentioned.
- FIG. 1 is a schematic cross-sectional view showing an example of the structure of a light emitting device.
- the light emitting device 100 includes a light emitting element 120, a heat sink 130, a case 140, a first lead frame 150, a second lead frame 160, a bonding wire 170, a bonding wire 172, and a complex 40.
- the light emitting element 120 is mounted in a predetermined area on the upper surface of the heat sink 130. By mounting the light emitting element 120 on the heat sink 130, the heat dissipation of the light emitting element 120 can be improved.
- a packaging substrate may be used instead of the heat sink 130.
- the light emitting element 120 is a semiconductor element that emits excitation light.
- the light emitting element 120 for example, an LED chip that generates light having a wavelength of 300 nm or more and 500 nm or less, which corresponds to blue light from near-ultraviolet light, can be used.
- One electrode (not shown) arranged on the upper surface side of the light emitting element 120 is connected to the surface of the first lead frame 150 via a bonding wire 170 such as a gold wire.
- the other electrode (not shown) formed on the upper surface of the light emitting element 120 is connected to the surface of the second lead frame 160 via a bonding wire 172 such as a gold wire.
- the case 140 is formed with a substantially funnel-shaped recess in which the hole diameter gradually expands from the bottom surface upward.
- the light emitting element 120 is provided on the bottom surface of the recess.
- the wall surface of the recess surrounding the light emitting element 120 serves as a reflector.
- the complex 40 is filled in the recess where the wall surface is formed by the case 140.
- the complex 40 is a wavelength conversion member that converts the excitation light emitted from the light emitting element 120 into light having a longer wavelength.
- the complex 40 the complex of the present embodiment is used, and the above-mentioned fluorescent powder 1 is dispersed in a sealing material 30 such as a resin.
- the light emitting device 100 emits a mixed color of the light of the light emitting element 120 and the light generated from the phosphor powder 1 that is excited by absorbing the light of the light emitting element 120.
- the composite 40 contains, for example, LuAG fluorescent powder in addition to the fluorescent powder 1 (encapsulating material 30). In addition to the fluorescent powder 1, it is preferable that the LuAG fluorescent powder is dispersed therein). In the present embodiment, good white light can be easily obtained because the peak wavelength and the half width of the fluorescence spectrum of the phosphor powder 1 are within a certain numerical range.
- a surface mount type light emitting device is illustrated, but the light emitting device is not limited to the surface mount type.
- the light emitting device may be a cannonball type, a COB (chip on board) type, a CSP (chip scale package) type, or the like.
- strontium nitride Sr 3 N 2 , purity 2 N, manufactured by High Purity Chemical Laboratory Co., Ltd.
- strontium nitride Sr 3 N 2 , purity 2 N, manufactured by High Purity Chemical Laboratory Co., Ltd.
- the glove box 240 g of the above raw material powder was filled in a container with a lid made of tungsten. After closing the lid of this container with a lid, it was taken out from the glove box and placed in an electric furnace equipped with a carbon heater. Then, sufficient vacuum exhaust was performed until the pressure in the electric furnace became 0.1 PaG or less. While continuing the vacuum exhaust, the temperature inside the electric furnace was raised to 600 ° C. After reaching 600 ° C., nitrogen gas was introduced into the electric furnace, and the pressure in the electric furnace was adjusted to 0.9 MPaG. Then, in the atmosphere of nitrogen gas, the temperature in the electric furnace was raised to 1950 ° C., and after reaching 1950 ° C., heat treatment was performed for 8 hours.
- nuclear particles having an average particle size of 11 ⁇ m and nuclear particles having an average particle size of 18 ⁇ m were prepared.
- Example 1 ⁇ Manufacturing of fluorescent powder> (Example 1)
- the obtained calcined powder was filled in a tungsten container, quickly transferred into an electric furnace equipped with a carbon heater, and sufficiently evacuated until the pressure in the furnace became 0.1 PaG or less. Heating was started while the vacuum exhaust was continued, and when the temperature reached 600 ° C., argon gas was introduced into the furnace, and the pressure in the atmosphere inside the furnace was adjusted to atmospheric pressure. Even after the introduction of argon gas was started, the temperature was continuously raised to 1350 ° C. After the temperature reached 1350 ° C., heat treatment was performed for 8 hours. Then, the heating was finished and the mixture was cooled to room temperature. After cooling to room temperature, the annealed powder was recovered from the container. The recovered powder was passed through a sieve to adjust the particle size. From the above, a red phosphor (annealed powder) was obtained.
- the annealing powder was added to 2.0 M hydrochloric acid at room temperature so that the slurry concentration was 25% by mass, and immersed for 1 hour. This resulted in acid treatment.
- the hydrochloric acid slurry was boiled for 1 hour with stirring.
- the slurry after the boiling treatment was cooled to room temperature and filtered to separate the acid treatment liquid from the synthetic powder.
- the synthetic powder after the acid treatment liquid was separated was placed in a dryer having a temperature setting in the range of 100 ° C. to 120 ° C. for 12 hours.
- the dried powder after the acid treatment step was filled in an alumina crucible, heated in the air at a heating rate of 10 ° C./min, and heat-treated at 400 ° C. for 3 hours. After heat treatment, it was left to stand until it reached room temperature. From the above, the fluorescent powder of Example 1 was obtained.
- the obtained phosphor sample was subjected to powder X-ray diffraction using CuK ⁇ rays using an X-ray diffractometer (Ultima IV manufactured by Rigaku Co., Ltd.).
- Fluorescence measurement was performed using a spectrofluorescence meter (F-7000, manufactured by Hitachi High-Technologies Corporation) corrected by Rhodamine B and a sub-standard light source.
- a solid sample holder attached to the photometer was used, and a fluorescence spectrum at an excitation wavelength of 455 nm was obtained. From the obtained fluorescence spectrum, the peak wavelength of the fluorescence spectrum and the half width of the fluorescence spectrum were determined. The peak intensity (relative emission peak intensity) was also determined.
- the peak intensity (relative emission peak intensity) will be supplemented.
- the relative emission peak intensity is obtained from phosphor particles as an object to be measured, with the peak height of the emission spectrum obtained by irradiating YAG: Ce (P46Y3 manufactured by Kasei Optonics Co., Ltd.) with monochromatic light of 455 nm as 100%.
- the peak height obtained is expressed as a relative peak intensity (%).
- the peak intensity in this example / comparative example is a relative value with respect to the standard sample.
- Luminance was evaluated by calculating a value I obtained by integrating the product of the fluorescence spectrum intensity and the luminosity factor at each wavelength in the wavelength region of 500 nm to 780 nm, with the wavelength as an integral variable, as described below.
- Table 1 summarizes the raw material preparation ratio and various measurement / evaluation results.
- “addition of a large amount of Sr” means that Sr 3 N 2 was used in an amount such that x in the above general formula was 0.95 ⁇ x ⁇ 1 at least in the charging ratio of the raw materials.
- the numerical values in the columns of Si (mol ratio), Al (mol ratio), Eu (mol ratio), Ca (mol ratio), Sr (mol ratio), Eu + Sr + Ca, Sr / (Sr + Ca) include nuclear particles. The elements inside are not included.
- the numerical value in the column of Sr / (Sr + Ca) corresponds to the value of x / (1-y) in the above general formula.
- the brightness I of the phosphor powders of Examples 1 to 3 "the peak wavelength is relatively short but the peak intensity is large" is 170 or more, which is clearly larger than that of Comparative Examples 1 to 4. there were. From this, it is understood that the fluorescent powders of Examples 1 to 3 can be preferably used for producing a high-brightness white LED.
Abstract
Description
具体例として、特許文献1には、一般式MaSrbCacAldSieNfで表される結晶相を含み、4000mW/mm2光励起での量子効率維持率が85%以上であることを特徴とする蛍光体が記載されている。この一般式において、Mは付活元素を表し、0<a<0.05、0.95≦b≦1、0≦c<0.1、a+b+c=1、0.7≦d≦1.3、0.7≦e≦1.3、2.5≦f≦3.5である。
CASNと同一の結晶相を有する一般式(Srx,Ca1-x-y,Euy)AlSi(N,O)3で表される赤色蛍光体からなる蛍光体粉末であって、
x<1、1-x-y>0であり、
波長455nmの青色励起光を照射したときの蛍光スペクトルのピーク波長が600nm以上610nm以下であり、
前記蛍光スペクトルの半値幅が73nm以下である蛍光体粉末
が提供される。
上記の蛍光体粉末と、前記蛍光体粉末を封止する封止材と、を備える複合体
が提供される。
励起光を発する発光素子と、前記励起光の波長を変換する上記の複合体と、を備える発光装置
が提供される。
上記の蛍光体粉末の製造方法であって、
出発原料を混合して原料混合粉末となす混合工程と、
前記原料混合粉末を焼成して焼成物を得る焼成工程と、
を含み、
前記出発原料が、平均粒径が5μm以上30μm以下であるSCASN蛍光体核粒子を含む、蛍光体粉末の製造方法
が提供される。
図面において、同様な構成要素には同様の符号を付し、適宜説明を省略する。
煩雑さを避けるため、同一図面内に同一の構成要素が複数ある場合には、その1つのみに符号を付し、全てには符号を付さない場合がある。
図面はあくまで説明用のものである。図面中の各部材の形状や寸法比などは、必ずしも現実の物品と対応しない。
本実施形態の蛍光体粉末は、CASNと同一の結晶相を有する一般式(Srx,Ca1-x-y,Euy)AlSi(N,O)3で表される赤色蛍光体からなる。この一般式において、x<1、1-x-y>0である。
また、本実施形態の蛍光体粉末に、波長455nmの青色励起光を照射したときの蛍光スペクトルのピーク波長は600nm以上610nm以下、好ましくは602nm以上609nm以下である。さらに、この蛍光スペクトルの半値幅は73nm以下、好ましくは70nm以上73nm以下、より好ましくは71nm以上73nm以下である。
一方、赤色光においては、視感度の関係から、発光(蛍光)スペクトルのピーク「波長」を短波長化することでも、輝度を向上させうる。つまり、赤色光の波長領域においては、長波長の光よりも、短波長の光のほうが、人間は「明るく」感じやすい傾向がある。本実施形態では、このことに基づき、CASNと同一の結晶相を有する一般式(Srx,Ca1-x-y,Euy)AlSi(N,O)3で表される赤色蛍光体において、波長455nmの青色励起光を照射したときの蛍光スペクトルのピーク波長が600nm以上610nm以下となるように蛍光体を設計した。この「ピーク波長の短波長化」により、白色LEDの輝度を向上させうる。
蛍光スペクトルのピーク波長が短波長であり、かつ、蛍光スペクトルの半値幅が小さい本実施形態の蛍光体粒子は、白色LEDの輝度の向上のために好ましく用いられる。
本実施形態の蛍光体粒子は、CASN(すなわちCaAlSiN3)と同一の結晶相を有する一般式(Srx,Ca1-x-y,Euy)AlSi(N,O)3で表される赤色蛍光体からなる。この一般式において、x<1、1-x-y>0である。ここで、(N,O)とあるのは、Nの一部が不可避的にOに置換されていることを表す。
CASNの骨格構造は、(Si,Al)-N4正四面体が結合することにより構成され、その骨格の間隙にCa原子が位置したものである。Ca2+の一部が発光中心として作用するEu2+で置換されることによって赤色蛍光体となる。
「Sr量が多い」という観点の別指標として、Sr/(Sr+Ca)のモル比は、好ましくは0.96以上0.999以下、より好ましくは0.97以上0.999以下である。
本実施形態の蛍光体粒子のメジアン径は、好ましくは1μm以上40μm以下、より好ましくは10μm以上30μm以下である。青色LEDからの青色光を赤色光に変換する用途においては、この程度のメジアン径が、輝度や変換効率などの諸性能のバランスの点で好ましい。
メジアン径は、レーザ回折散乱法により、体積基準の値として測定することができる。
メジアン径の調整は、粉砕、篩分けなどの公知の手段を適宜適用することで行うことができる。詳細は後述する。
本実施形態の蛍光体粉末は、原材料の選択、各原材料の使用比率、製造手順・製造条件などを適切に選択することによって得ることができる。具体的には、本実施形態の蛍光体粉末は、好ましくは、
・出発原料を混合して原料混合粉末となす混合工程と、
・原料混合粉末を焼成して焼成物を得る焼成工程と、
を経ることで製造することができる。また、蛍光体粉末の製造に際しては、これら以外の追加の工程があってもよい。
混合工程においては、出発原料を混合して原料混合粉末とする。
出発原料としては、ユウロピウム化合物、窒化ストロンチウムなどのストロンチウム化合物、窒化カルシウムなどのカルシウム化合物、窒化ケイ素、窒化アルミニウム、などを挙げることができる。
各出発原料の形態は、好ましくは粉末状である。
短波長化の点で、本実施形態においてはユウロピウムの量は比較的少なめであることが好ましい。
短波長化の点で、本実施形態においてはストロンチウムの量は比較的多めであることが好ましい。
本明細書では、このSCASN蛍光体核粒子を、単に「核粒子」「核」などとも表記する。
出発原料の劣化や、意図せぬ酸素の混入を抑えるため、混合工程は、窒素雰囲気下や、水分(湿気)ができるだけ少ない環境下で行われることが好ましい。
焼成工程においては、混合工程で得られた原料混合粉末を焼成して焼成物を得る。
焼成工程における焼成温度は、1800℃以上2100℃以下が好ましく、1900℃以上2000℃以下がより好ましい。焼成温度が上記下限値以上であることで、蛍光体粒子の粒成長がより効果的に進行する。そのため、光吸収率、内部量子効率及び外部量子効率をより一層良好にすることができる。焼成温度が上記上限値以下であることで、蛍光体粒子の分解をより一層抑制できる。そのため、光吸収率、内部量子効率および外部量子効率をより一層良好にすることができる。
焼成工程における昇温時間、昇温速度、加熱保持時間および圧力等の他の条件も特に限定されず、使用する原料に応じて適宜調整すればよい。典型的には、加熱保持時間は3時間以上30時間以下が好ましく、圧力は0.6MPa以上10MPa以下(ゲージ圧)が好ましい。酸素濃度のコントロールなどの観点では、焼成工程は窒素ガス雰囲気下で行われることが好ましい。つまり、焼成工程は、圧力0.6MPa以上10MPa以下(ゲージ圧)の窒素ガス雰囲気下で行われることが好ましい。
追加の工程として、粉状化工程を行ってもよい。焼成工程を経て得られる焼成物は、通常、粒状または塊状の焼結体である。焼成物が塊状で取り扱いにくい場合などには、解砕、粉砕、分級等の処理を単独または組み合わせて用いることにより、焼成物を一旦粉状にして焼結粉を得ることができる。
具体的な処理方法としては、例えば、焼結体をボールミルや振動ミル、ジェットミル等の一般的な粉砕機を使用して所定の粒度に粉砕する方法が挙げられる。ただし、過度の粉砕は、光を散乱しやすい微粒子を生成する場合や、粒子表面に結晶欠陥をもたらすことで発光効率の低下を引き起こす場合があるので留意する。
追加の工程として、アニール工程を行ってもよい。具体的には、焼成工程後に、焼成工程における焼成温度よりも低い温度で、焼成粉をアニールしてアニール粉を得るアニール工程があってもよい。
アニール工程は、希ガス、窒素ガス等の不活性ガス、水素ガス、一酸化炭素ガス、炭化水素ガス、アンモニアガス等の還元性ガス、若しくはこれらの混合ガス、または真空中等の純窒素以外の非酸化性雰囲気中で行うことが好ましい。特に好ましくは、水素ガス雰囲気中やアルゴン雰囲気中で行われる。
アニール工程は、大気圧下、加圧下、減圧下のいずれで行われてもよい。アニール工程における熱処理温度は、1300℃以上1400℃以下が好ましい。アニール工程の時間は、特に限定されないが、3時間以上12時間以下が好ましく、5時間以上10時間以下がより好ましい。
アニール工程を行うことにより、蛍光体粒子の発光効率を十分に向上させることができる。また、元素の再配列により、ひずみや欠陥が除去されるため、透明性も向上させることができる。
アニール工程では、異相が発生する場合がある。しかし、これは後述する工程によって十分に除去することができる。
追加の工程として、酸処理工程を行ってもよい。酸処理工程においては、通常、アニール工程で得られたアニール粉を酸処理する。これにより、発光に寄与しない不純物の少なくとも一部を除去することができる。ちなみに、発光に寄与しない不純物は、焼成工程やアニール工程の際に発生すると推察される。
酸処理は、アニール粉を、上述の酸を含む水溶液に分散させることにより行うことができる。攪拌の時間は、例えば10分以上6時間以下、好ましくは30分以上3時間以下である。攪拌の際の温度は、例えば40℃以上90℃以下、好ましくは50℃以上70℃以下とすることができる。
酸処理工程の後、アニール粉が分散した液を煮沸処理してもよい。
酸処理工程の後、蛍光体粉末以外の物質をろ過で分離し、必要に応じて蛍光体粒子に付着した物質を水洗してもよい。水洗後は、通常、自然乾燥または乾燥機での乾燥により、蛍光体粉末を乾燥させる。乾燥した蛍光体粉末をるつぼに入れて加熱して表面改質してもよい。
複合体は、例えば、上述した蛍光体粉末と、その蛍光体粉末を封止する封止材と、を備える。複合体においては、上述した蛍光体粉末が封止材中に分散している。
封止材としては、周知の樹脂やガラス、セラミックスなどの材料を用いることができる。封止材に用いる樹脂としては、例えば、シリコーン樹脂、エポキシ樹脂、ウレタン樹脂などの透明樹脂が挙げられる。
図1は、発光装置の構造の一例を示す概略断面図である。図1に示されるように、発光装置100は、発光素子120、ヒートシンク130、ケース140、第1リードフレーム150、第2リードフレーム160、ボンディングワイヤ170、ボンディングワイヤ172および複合体40を備える。
本実施形態においては、蛍光体粉末1の蛍光スペクトルのピーク波長や半値幅が一定の数値範囲内にあることにより、良好な白色光を得やすい。
まず、容器に、61.38gのα型窒化ケイ素(Si3N4、宇部興産株式会社製、SN-E10グレード)、53.80gの窒化アルミニウム(AlN、株式会社トクヤマ製、Eグレード)、および0.92gの酸化ユウロピウム(Eu2O3、信越化学工業株式会社製)を入れ、予備混合した。
次に、水分が1質量ppm以下、酸素濃度が50ppm以下に調整された窒素雰囲気に保持したグローブボックス中で、上記容器に、2.98gの窒化カルシウム(Ca3N2、Materion社製)、および120.92gの窒化ストロンチウム(Sr3N2、純度2N、株式会社高純度化学研究所製)を更に入れ、乾式混合した。以上により、原料粉末(混合粉末)を得た。
真空排気を継続したまま、電気炉内の温度が600℃になるまで昇温した。600℃に到達した後、電気炉内に窒素ガスを導入し、電気炉内の圧力が0.9MPaGとなるように調整した。その後、窒素ガスの雰囲気下で、電気炉内の温度が1950℃になるまで昇温し、1950℃に到達してから8時間かけて加熱処理した。その後、加熱を終了し、室温まで冷却した。室温まで冷却した後、容器から赤色の塊状物を回収した。回収した塊状物を乳鉢で解砕及び通篩し、粒度を調整した。
粒度を調整する方法を変えることにより、平均粒径11μmの核粒子と、平均粒径18μmの核粒子と、を作製した。
(実施例1)
容器に、54.96gのα型窒化ケイ素(Si3N4、宇部興産株式会社製、SN-E10グレード)、48.18gの窒化アルミニウム(AlN、株式会社トクヤマ製、Eグレード)、および0.41gの酸化ユウロピウム(Eu2O3、信越化学工業株式会社製)、24.00gの上記で作製した平均粒径18μmの核を入れ、予備混合した。
次に、水分が1質量ppm以下、酸素濃度が50ppm以下に調整された窒素雰囲気に保持したグローブボックス中で、上記容器に、1.34gの窒化カルシウム(Ca3N2、Materion社製)、および111.11gの窒化ストロンチウム(Sr3N2、純度2N、株式会社高純度化学研究所製)を更に測り取り、乾式混合した。これにより原料粉末(混合粉末)を得た。
真空排気を継続したまま、電気炉内の温度が600℃になるまで昇温した。600℃に到達した後、電気炉内に窒素ガスを導入し、電気炉内の圧力が0.9MPaGとなるように調整した。その後、窒素ガスの雰囲気下で、電気炉内の温度が1950℃になるまで昇温し、1950℃に到達してから8時間かけて加熱処理した。その後、加熱を終了し、室温まで冷却させた。室温まで冷却した後、容器から赤色の塊状物を回収した。回収した塊状物を解砕、通篩し、粒度を調整して赤色蛍光体(焼成粉)を得た。
煮沸処理後のスラリーを室温まで冷却し濾過し、合成粉末から酸処理液を分離した。酸処理液分離後の合成粉末を、100℃から120℃の範囲の温度設定をした乾燥機内に12時間置いた。
酸処理工程後の乾燥した粉末をアルミナ製坩堝に充填し、大気中、昇温速度10℃/分で昇温し、400℃で3時間加熱処理した。加熱処理後、室温になるまで放置した。
以上により、実施例1の蛍光体粉末を得た。
使用原料について、Si3N4=54.68g、AlN=47.93g、Eu2O3=0.41g、Ca3N2=0.17g、Sr3N2=112.81g、核(平均粒径18μm)=24.00gであったこと以外は、実施例1と同様にして、実施例2の蛍光体粉末を得た。
使用原料について、Si3N4=54.94g、AlN=48.18g、Eu2O3=0.41g、Ca3N2=1.34g、Sr3N2=111.13g、核(平均粒径11μm)=24.00gであったこと以外は、実施例1と同様にして、実施例3の蛍光体粉末を得た。
使用原料について、Si3N4=61.47g、AlN=53.88g、Eu2O3=0.46g、Ca3N2=3.12g、Sr3N2=121.07gであり、かつ、核を用いなかったこと以外は、実施例1と同様にして、比較例1の蛍光体粉末を得た。
使用原料について、Si3N4=61.38g、AlN=53.80g、Eu2O3=0.92g、Ca3N2=2.98g、Sr3N2=120.92gであり、かつ、核を用いなかったこと以外は、実施例1と同様にして、比較例2の蛍光体粉末を得た。
使用原料について、Si3N4=60.98g、AlN=53.46g、Eu2O3=0.92g、Ca3N2=1.35g、Sr3N2=123.29gであり、かつ、核を用いなかったこと以外は、実施例1と同様にして、比較例3の蛍光体粉末を得た。
使用原料について、Si3N4=60.91g、AlN=53.39g、Eu2O3=0.92g、Ca3N2=1.03g、Sr3N2=123.75gであり、かつ、核を用いなかったこと以外は、実施例1と同様にして、比較例4の蛍光体粉末を得た。
Microtrac MT3300EX II(マイクロトラック・ベル株式会社製)を用い、JIS R1629:1997に準拠したレーザ回折散乱法により測定した。イオン交換水100ccに蛍光体粉末0.5gを投入し、そこにUltrasonic Homogenizer US-150E(株式会社日本精機製作所、チップサイズφ20mm、Amplitude100%、発振周波数19.5KHz、振幅約31μm)で3分間、分散処理を行い、その後、MT3300EX IIで粒度測定を行った。得られた粒度分布からメジアン径を求めた。
ローダミンBと副標準光源により補正を行った分光蛍光光度計(日立ハイテクノロジーズ社製、F-7000)を用いて蛍光測定を行った。測定には、光度計に付属の固体試料ホルダーを使用し、励起波長455nmでの蛍光スペクトルを得た。得られた蛍光スペクトルから、蛍光スペクトルのピーク波長および蛍光スペクトルの半値幅を求めた。また、ピーク強度(相対発光ピーク強度)も求めた。
相対発光ピーク強度は、455nmの単色光をYAG:Ce(化成オプトニクス株式会社製P46Y3)に照射して得られる発光スペクトルのピーク高さを100%とし、被測定物としての蛍光体粒子より得られたピーク高さを相対ピーク強度(%)で表したものである。要するに、本実施例・比較例におけるピーク強度は、標準サンプルに対する相対値である。
輝度は、以下のように、波長を積分変数として、波長が500nmから780nmの領域において、各波長における蛍光スペクトル強度と視感度との積を積分した値Iを算出することで評価した。視感度の値は、波長555nmの光=1と規定されている明所視標準比視感度に依った。
値Iが大きいSCASN蛍光体粉末は、高輝度な白色LEDの製造に好ましく使用可能であるといえる。
表1において、「Sr多量添加」とは、少なくとも原料の仕込み比において、前述の一般式におけるxが0.95≦x<1となるような量でSr3N2を用いたことを表す。
表1において、Si(mol比)、Al(mol比)、Eu(mol比)、Ca(mol比)、Sr(mol比)、Eu+Sr+Ca、Sr/(Sr+Ca)の欄の数値には、核粒子中の元素は含まれていない。
表1において、Sr/(Sr+Ca)の欄の数値は、前述の一般式において、x/(1-y)の値に相当する。
実施例1~3の蛍光体粉末のピーク波長は比較的短い(600nm以上610nm以下)にもかかわらず、それら蛍光体粉末のピーク強度は、比較例2~4(ピーク波長が610nm超である)と同程度の大きな値であった。これは、おそらくは、半値幅が73nm以下となるように実施例1~3の蛍光体粉末は設計されたためと推測される。
また、ピーク波長が同程度である実施例1~3と比較例1を比べると、比較例1は、おそらくは半値幅が73nm超であるために、ピーク強度が小さかった。
そして、「ピーク波長が比較的短いにもかかわらず、ピーク強度が大きい」実施例1~3の蛍光体粉末の輝度Iは、170以上と、比較例1~4に比べて明らかに大きな値であった。このことから、実施例1~3の蛍光体粉末は、高輝度な白色LEDの製造に好ましく使用可能であることが理解される。
30 封止材
40 複合体
100 発光装置
120 発光素子
130 ヒートシンク
140 ケース
150 第1リードフレーム
160 第2リードフレーム
170 ボンディングワイヤ
172 ボンディングワイヤ
Claims (10)
- CASNと同一の結晶相を有する一般式(Srx,Ca1-x-y,Euy)AlSi(N,O)3で表される赤色蛍光体からなる蛍光体粉末であって、
x<1、1-x-y>0であり、
波長455nmの青色励起光を照射したときの蛍光スペクトルのピーク波長が600nm以上610nm以下であり、
前記蛍光スペクトルの半値幅が73nm以下である蛍光体粉末。 - 請求項1に記載の蛍光体粉末であって、
y<0.01である蛍光体粉末。 - 請求項1または2に記載の蛍光体粉末であって、
当該蛍光体粉末の、Sr/(Sr+Ca)のモル比は、0.96以上0.999以下である蛍光体粉末。 - 請求項1から3のいずれか1項に記載の蛍光体粉末であって、
前記蛍光スペクトルの半値幅は、70nm以上73nm以下である蛍光体粉末。 - 請求項1から4のいずれか1項に記載の蛍光体粉末であって、
メジアン径が1μm以上40μm以下である蛍光体粉末。 - 請求項1から5のいずれか1項に記載の蛍光体粉末と、前記蛍光体粉末を封止する封止材と、
を備える複合体。 - 励起光を発する発光素子と、
前記励起光の波長を変換する請求項6に記載の複合体と、
を備える発光装置。 - 請求項1から5のいずれか1項に記載の蛍光体粉末の製造方法であって、
出発原料を混合して原料混合粉末となす混合工程と、
前記原料混合粉末を焼成して焼成物を得る焼成工程と、
を含み、
前記出発原料が、平均粒径が5μm以上30μm以下であるSCASN蛍光体核粒子を含む、蛍光体粉末の製造方法。 - 請求項8に記載の蛍光体粉末の製造方法であって、
さらに、前記焼成工程の後に、前記焼成工程における焼成温度よりも低い温度で、焼成粉をアニールしてアニール粉を得るアニール工程を含む、蛍光体粉末の製造方法。 - 請求項9に記載の蛍光体粉末の製造方法であって、
さらに、前記アニール工程で得られたアニール粉を酸処理する酸処理工程を含む、蛍光体粉末の製造方法。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020227034138A KR20220155312A (ko) | 2020-03-30 | 2021-03-19 | 형광체 분말, 복합체, 발광 장치 및 형광체 분말의 제조 방법 |
CN202180026056.2A CN115362239A (zh) | 2020-03-30 | 2021-03-19 | 荧光体粉末、复合体、发光装置和荧光体粉末的制造方法 |
US17/914,263 US20230348780A1 (en) | 2020-03-30 | 2021-03-19 | Phosphor powder, composite, light-emitting device, and method for producing phosphor powder |
JP2022511927A JPWO2021200287A1 (ja) | 2020-03-30 | 2021-03-19 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2020061212 | 2020-03-30 | ||
JP2020-061212 | 2020-03-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2021200287A1 true WO2021200287A1 (ja) | 2021-10-07 |
Family
ID=77927755
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2021/011488 WO2021200287A1 (ja) | 2020-03-30 | 2021-03-19 | 蛍光体粉末、複合体、発光装置および蛍光体粉末の製造方法 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20230348780A1 (ja) |
JP (1) | JPWO2021200287A1 (ja) |
KR (1) | KR20220155312A (ja) |
CN (1) | CN115362239A (ja) |
TW (1) | TW202140750A (ja) |
WO (1) | WO2021200287A1 (ja) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005052087A1 (ja) * | 2003-11-26 | 2005-06-09 | Independent Administrative Institution National Institute For Materials Science | 蛍光体と蛍光体を用いた発光器具 |
WO2006126567A1 (ja) * | 2005-05-24 | 2006-11-30 | Mitsubishi Chemical Corporation | 蛍光体及びその利用 |
CN103113884A (zh) * | 2013-02-05 | 2013-05-22 | 江门市远大发光材料有限公司 | 一种基于氮化物红色荧光粉的led植物生长灯 |
CN105255485A (zh) * | 2015-10-26 | 2016-01-20 | 江门市科恒实业股份有限公司 | 一种氮化物荧光粉及其制备方法 |
CN105385014A (zh) * | 2015-12-11 | 2016-03-09 | 华南农业大学 | 一种转光农膜及其制备方法与应用 |
WO2017188795A1 (ko) * | 2016-04-29 | 2017-11-02 | 엘지이노텍 주식회사 | 형광체 조성물, 이를 포함하는 발광 소자 패키지 및 조명 장치 |
WO2020209055A1 (ja) * | 2019-04-09 | 2020-10-15 | デンカ株式会社 | 窒化物蛍光体及び発光装置 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090283721A1 (en) * | 2008-05-19 | 2009-11-19 | Intematix Corporation | Nitride-based red phosphors |
JP7155507B2 (ja) | 2017-10-25 | 2022-10-19 | 三菱ケミカル株式会社 | 蛍光体、発光装置、照明装置及び画像表示装置 |
-
2021
- 2021-03-19 CN CN202180026056.2A patent/CN115362239A/zh active Pending
- 2021-03-19 WO PCT/JP2021/011488 patent/WO2021200287A1/ja active Application Filing
- 2021-03-19 KR KR1020227034138A patent/KR20220155312A/ko unknown
- 2021-03-19 US US17/914,263 patent/US20230348780A1/en active Pending
- 2021-03-19 JP JP2022511927A patent/JPWO2021200287A1/ja active Pending
- 2021-03-26 TW TW110110995A patent/TW202140750A/zh unknown
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005052087A1 (ja) * | 2003-11-26 | 2005-06-09 | Independent Administrative Institution National Institute For Materials Science | 蛍光体と蛍光体を用いた発光器具 |
WO2006126567A1 (ja) * | 2005-05-24 | 2006-11-30 | Mitsubishi Chemical Corporation | 蛍光体及びその利用 |
CN103113884A (zh) * | 2013-02-05 | 2013-05-22 | 江门市远大发光材料有限公司 | 一种基于氮化物红色荧光粉的led植物生长灯 |
CN105255485A (zh) * | 2015-10-26 | 2016-01-20 | 江门市科恒实业股份有限公司 | 一种氮化物荧光粉及其制备方法 |
CN105385014A (zh) * | 2015-12-11 | 2016-03-09 | 华南农业大学 | 一种转光农膜及其制备方法与应用 |
WO2017188795A1 (ko) * | 2016-04-29 | 2017-11-02 | 엘지이노텍 주식회사 | 형광체 조성물, 이를 포함하는 발광 소자 패키지 및 조명 장치 |
WO2020209055A1 (ja) * | 2019-04-09 | 2020-10-15 | デンカ株式会社 | 窒化物蛍光体及び発光装置 |
Non-Patent Citations (2)
Title |
---|
WATANABE HIROMU, KIJIMA NAOTO: "Synthesis of Sr 0.99 Eu 0.01 AlSiN 3 from intermetallic precursor", THE CERAMIC SOCIETY OF JAPAN JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, 1 January 2009 (2009-01-01), pages 115 - 119, XP055926565, Retrieved from the Internet <URL:https://www.jstage.jst.go.jp/article/jcersj2/117/1361/117_1361_115/_pdf/-char/en> [retrieved on 20220531] * |
WATANABE, H. ; KIJIMA, N.: "Crystal structure and luminescence properties of SrxCa1−xAlSiN3:Eu2+ mixed nitride phosphors", JOURNAL OF ALLOYS AND COMPOUNDS, ELSEVIER SEQUOIA, LAUSANNE., CH, vol. 475, no. 1-2, 5 May 2009 (2009-05-05), CH , pages 434 - 439, XP026035585, ISSN: 0925-8388, DOI: 10.1016/j.jallcom.2008.07.054 * |
Also Published As
Publication number | Publication date |
---|---|
JPWO2021200287A1 (ja) | 2021-10-07 |
CN115362239A (zh) | 2022-11-18 |
TW202140750A (zh) | 2021-11-01 |
US20230348780A1 (en) | 2023-11-02 |
KR20220155312A (ko) | 2022-11-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP7312187B2 (ja) | 蛍光体及び発光装置 | |
KR101419626B1 (ko) | β형 사이알론, β형 사이알론의 제조 방법 및 발광 장치 | |
JPWO2020054350A1 (ja) | 蛍光体及び発光装置 | |
TWI829904B (zh) | 螢光體粉末、複合體及發光裝置 | |
WO2021200287A1 (ja) | 蛍光体粉末、複合体、発光装置および蛍光体粉末の製造方法 | |
JP6970658B2 (ja) | 蛍光体、発光素子及び発光装置 | |
WO2020235297A1 (ja) | α型サイアロン蛍光体、発光部材、および発光装置 | |
US11380822B2 (en) | Red phosphor and light emission device | |
WO2022202407A1 (ja) | 蛍光体粉末、複合体および発光装置 | |
WO2022102503A1 (ja) | 蛍光体粉末、発光装置、画像表示装置および照明装置 | |
WO2022102511A1 (ja) | 蛍光体粉末、発光装置、画像表示装置および照明装置 | |
WO2022102512A1 (ja) | 蛍光体粉末、発光装置、画像表示装置および照明装置 | |
WO2022123997A1 (ja) | 蛍光体粉末、発光装置、画像表示装置および照明装置 | |
JP7252186B2 (ja) | 蛍光体粉末、複合体および発光装置 | |
JP2022116885A (ja) | 蛍光体粉末の製造方法 | |
JP2022148419A (ja) | β型サイアロン蛍光体粉末および発光装置 | |
TW202102648A (zh) | 螢光體粒子、複合體、發光裝置、及螢光體粒子之製造方法 | |
JP2022013281A (ja) | β型サイアロン蛍光体の製造方法、波長変換部材の製造方法、及び発光装置の製造方法 |
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: 21780788 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2022511927 Country of ref document: JP Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 20227034138 Country of ref document: KR Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 21780788 Country of ref document: EP Kind code of ref document: A1 |