WO2014091776A1 - 蛍光体、その製造方法及び発光装置 - Google Patents
蛍光体、その製造方法及び発光装置 Download PDFInfo
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- WO2014091776A1 WO2014091776A1 PCT/JP2013/060109 JP2013060109W WO2014091776A1 WO 2014091776 A1 WO2014091776 A1 WO 2014091776A1 JP 2013060109 W JP2013060109 W JP 2013060109W WO 2014091776 A1 WO2014091776 A1 WO 2014091776A1
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- phosphor
- light
- emitting device
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- light emitting
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 128
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 27
- 229910052788 barium Inorganic materials 0.000 claims abstract description 25
- 229910052712 strontium Inorganic materials 0.000 claims abstract description 25
- 238000000137 annealing Methods 0.000 claims description 27
- 238000010304 firing Methods 0.000 claims description 18
- 238000010306 acid treatment Methods 0.000 claims description 17
- 150000001875 compounds Chemical class 0.000 claims description 17
- 150000004767 nitrides Chemical class 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 11
- 150000004820 halides Chemical class 0.000 claims description 9
- -1 oxides Chemical class 0.000 claims description 9
- 150000004678 hydrides Chemical class 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 229910021332 silicide Inorganic materials 0.000 claims description 8
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims description 7
- 150000001247 metal acetylides Chemical class 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 5
- 239000004973 liquid crystal related substance Substances 0.000 claims description 3
- 229910052702 rhenium Inorganic materials 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 abstract description 6
- 229910052684 Cerium Inorganic materials 0.000 abstract description 4
- 229910052693 Europium Inorganic materials 0.000 abstract description 4
- 229910052769 Ytterbium Inorganic materials 0.000 abstract description 4
- 229910052771 Terbium Inorganic materials 0.000 abstract description 3
- 229910052746 lanthanum Inorganic materials 0.000 abstract description 3
- 229910052749 magnesium Inorganic materials 0.000 abstract description 3
- 229910052706 scandium Inorganic materials 0.000 abstract description 3
- 229910052727 yttrium Inorganic materials 0.000 abstract description 3
- 229910052772 Samarium Inorganic materials 0.000 abstract description 2
- OGPBJKLSAFTDLK-UHFFFAOYSA-N europium atom Chemical compound [Eu] OGPBJKLSAFTDLK-UHFFFAOYSA-N 0.000 abstract description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 abstract 1
- 239000011575 calcium Substances 0.000 abstract 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 abstract 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 abstract 1
- 239000011777 magnesium Substances 0.000 abstract 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 abstract 1
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 abstract 1
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 abstract 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 abstract 1
- GZCRRIHWUXGPOV-UHFFFAOYSA-N terbium atom Chemical compound [Tb] GZCRRIHWUXGPOV-UHFFFAOYSA-N 0.000 abstract 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 abstract 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 19
- 239000000843 powder Substances 0.000 description 14
- 239000013078 crystal Substances 0.000 description 10
- 230000005284 excitation Effects 0.000 description 7
- 239000012299 nitrogen atmosphere Substances 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 239000002585 base Substances 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 239000011812 mixed powder Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 229910052582 BN Inorganic materials 0.000 description 3
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 3
- 229910003564 SiAlON Inorganic materials 0.000 description 3
- 238000000295 emission spectrum Methods 0.000 description 3
- 238000000695 excitation spectrum Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000003929 acidic solution Substances 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 102100032047 Alsin Human genes 0.000 description 1
- 101710187109 Alsin Proteins 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910004283 SiO 4 Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- OLBVUFHMDRJKTK-UHFFFAOYSA-N [N].[O] Chemical compound [N].[O] OLBVUFHMDRJKTK-UHFFFAOYSA-N 0.000 description 1
- 229910001508 alkali metal halide Inorganic materials 0.000 description 1
- 150000008045 alkali metal halides Chemical class 0.000 description 1
- 229910001615 alkaline earth metal halide Inorganic materials 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 229910001940 europium oxide Inorganic materials 0.000 description 1
- 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 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- BDAGIHXWWSANSR-NJFSPNSNSA-N hydroxyformaldehyde Chemical compound O[14CH]=O BDAGIHXWWSANSR-NJFSPNSNSA-N 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000009103 reabsorption Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 229910000018 strontium carbonate Inorganic materials 0.000 description 1
Images
Classifications
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- 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
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
-
- 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
Definitions
- the present invention has a composite oxynitride base crystal, is excited efficiently in the wavelength region from ultraviolet to near ultraviolet, and emits blue light with high brightness, a method for producing the phosphor, and the phosphor
- the present invention relates to a light emitting device.
- Phosphors are excited by excitation sources having high energy such as vacuum ultraviolet rays, ultraviolet rays, electron beams, near ultraviolet rays, etc., and emit visible light.
- excitation sources having high energy such as vacuum ultraviolet rays, ultraviolet rays, electron beams, near ultraviolet rays, etc.
- the luminance of the phosphors is reduced.
- phosphors having a conventional oxide matrix such as silicate phosphors, phosphate phosphors, aluminate phosphors, and phosphors having a sulfide-based matrix, have high chemical stability and heat resistance.
- a phosphor having an oxynitride base known as a structural material has been proposed (Patent Documents 1 to 3).
- a phosphor having an oxynitride base is obtained by dissolving a rare earth element such as europium in a crystal called sialon (SiAlON).
- the present inventors have studied the relationship between the crystal structure of sialon and the rare earth element. When the crystal structure of the sialon and the rare earth element satisfy a specific condition, the emission peak is different from that of the conventionally known blue phosphor.
- the present inventors have found that the light-emitting blue phosphor having a wavelength has a high brightness and thus completed the present invention. That is, an object of the present invention is to provide a blue phosphor having an emission peak wavelength different from that of a conventional blue phosphor, a method for producing the same, and a high-luminance light emitting device using the phosphor.
- the present invention relates to fluorescence of a crystal represented by a general formula: Me a Re b Al c Si d O e N f (where Me is one or more elements selected from Sr and Ba, and Re is Eu).
- the phosphors of the present invention preferably have c, d, e and f having a relationship of 0.500 ⁇ c / d ⁇ 0.720 and 0.900 ⁇ e / f ⁇ 1.570.
- the phosphor of the present invention is excited by light having a wavelength of 300 nm or more and 420 nm or less, and has a light emission peak wavelength at a wavelength of 450 nm or more and 485 nm or less.
- Another aspect of the present invention is a method for producing the phosphor of the present invention, which includes a mixing step of mixing the following compounds (1) to (4), and a baking step of baking the mixture after the mixing step And an annealing step for annealing after the firing step and an acid treatment step for acid treatment after the annealing step: (1) One or more carbonates, oxides, nitrides, carbides, hydrides or silicides of an element represented by Me (where Me is one or more elements selected from Sr and Ba); (2) One or more of carbonates, oxides, halides, nitrides, carbides, hydrides or silicides of an element represented by Re (where Re is composed of Eu); (3) One or more types of Al compounds selected from Al oxides, Al halides, Al nitrides or Al metals; (4) One or more types of Si compounds selected from Si nitride, Si oxide, Si oxynitride, and Si metal.
- the firing step is preferably performed under a temperature condition of 1400 ° C. or higher and 1800 ° C. or lower under an atmospheric gas pressure of 1 atm or higher.
- the annealing step is preferably performed at 1200 ° C. or higher and 1600 ° C. or lower.
- the firing step is performed by firing at a temperature of 1400 ° C. or higher and 1800 ° C. or lower under an atmospheric gas pressure of 1 atm or higher.
- the phosphors may be mixed.
- the invention from another viewpoint is a light emitting device comprising a light emitting element and the phosphor of the present invention.
- the light emitting device of the present invention it is preferable to further include at least one phosphor having an emission peak wavelength longer than that of the phosphor of the present invention.
- the light emitting element preferably employs either an inorganic light emitting element or an organic light emitting element having a light emission of 340 nm to 450 nm.
- the light emitting element is preferably an LED element.
- the light emitting device is preferably a liquid crystal TV backlight, a projector light source device, a lighting device or a signal device.
- the emission peak wavelength of the phosphor of the present invention is shifted to a longer wavelength side than the emission peak wavelength of the conventional blue phosphor, and the emission band width is wide and includes a wavelength range with good visibility. It exhibits a high blue color.
- a phosphor exhibiting a blue color with higher brightness than conventional phosphors can be manufactured.
- the light emitting device which is an invention from another viewpoint it is possible to provide a light emitting device having a phosphor exhibiting a lighter blue color.
- the present invention relates to fluorescence of a crystal represented by a general formula: Me a Re b Al c Si d O e N f (where Me is one or more elements selected from Sr and Ba, and Re is Eu).
- Me is one or more elements selected from Sr and Ba, and Ba alone is preferable. When both Sr and Ba are included, it is preferable to include a large amount of Ba. This is because when Ba is contained, the crystal structure becomes more stable and the light emission efficiency becomes higher.
- Me may further include one or more elements selected from Mg, Ca, Sc, Y, and La.
- the Re element may further contain one or more elements selected from Mn, Ce, Tb, Yb and Sm in addition to Eu. As an element other than Eu, Ce or Yb is preferable.
- b representing the ion concentration of a light emitting element such as Eu represented by Re is 0.005 ⁇ b ⁇ 0.25, preferably 0.01 ⁇ b ⁇ 0.20, and more preferably Is in the range of 0.02 ⁇ b ⁇ 0.10.
- b is less than 0.005
- the number of atoms of the light emitting element ions is small, sufficient light emission efficiency cannot be obtained.
- b exceeds 0.25, the number of atoms of the light-emitting element ions becomes too large, and a phenomenon called concentration quenching, which is an effect of reabsorption of excitation energy by adjacent light-emitting ions, occurs. Efficiency cannot be obtained.
- the ratio of Al element, Si element, O element, and N element is represented by c to f, and 1.60 ⁇ c ⁇ 2.60; 2.45 ⁇ d ⁇ 4.05, respectively. 3.05 ⁇ e ⁇ 5.00; 2.75 ⁇ f ⁇ 4.40.
- the phosphor of the present invention has a stable crystal structure as long as all the conditions of the composition ratios a to f are satisfied. If these numerical values are lower than the lower limit value or higher than the upper limit value, it is not preferable because it facilitates the formation of the second-phase fired product during the production or the luminous efficiency of the produced phosphor becomes low.
- the conditions of the composition ratios c to f are 1.83 ⁇ c ⁇ 2.20; 2.73 ⁇ d ⁇ 3.50; 3.28 ⁇ e ⁇ 4.90; 3.12 ⁇ f ⁇ 4.23. More preferably it is.
- the c / d and e / f of the phosphor of the present invention preferably have a relationship of 0.500 ⁇ c / d ⁇ 0.720 and 0.900 ⁇ e / f ⁇ 1.570.
- C / d for determining the ratio of Al element to Si element and e / f for determining the ratio of O element to N element are 0.500 ⁇ c / d ⁇ 0.720, 0.900 ⁇ e / f ⁇ . 1.570, preferably 0.610 ⁇ c / d ⁇ 0.690, 1.000 ⁇ e / f ⁇ 1.450, and further 0.620 ⁇ c / d ⁇ 0.675, 1.007 ⁇ . It is preferable that e / f ⁇ 1.320 because the crystal structure is more stable and the light emission efficiency is increased. A phosphor having c / d and e / f outside these ranges has lower luminous efficiency than a phosphor within the range.
- composition ratios a to f of the phosphor of the present invention are set to 0.90 ⁇ a ⁇ 0.98; 0.02 ⁇ b ⁇ 0.10; 1.83 ⁇ c ⁇ 2.20; 2.73 ⁇ d ⁇ 3. .50; 3.28 ⁇ e ⁇ 4.47; 3.12 ⁇ f ⁇ 4.04, 0.620 ⁇ c / d ⁇ 0.675, 1.007 ⁇ e / f ⁇ 1.320 This is preferable because the crystal structure is stable and the emission peak wavelength is stable at around 470 nm.
- the phosphor of the present invention is preferably excited by light having a wavelength of 300 nm or more and 420 nm or less and having a light emission peak wavelength of 450 nm or more and 485 nm or less, and more preferably, the light emission peak wavelength belongs to a wavelength range of 469 nm ⁇ 8 nm. It is.
- the phosphor manufacturing method of the present invention includes a mixing step of mixing the following compounds (1) to (4), a baking step of baking the mixture after the mixing step, and an annealing step of annealing after the baking step. And an acid treatment step of acid treatment after the annealing step: (1) An element represented by Me (where Me is one or more elements selected from Sr and Ba, and may further include one or more elements selected from Mg, Ca, Sc, Y, and La).
- One or more of carbonate, oxide, nitride, carbide, hydride, or silicide (2) carbonates, oxides, halides of an element represented by Re (provided that Re is made of Eu and may further include one or more elements selected from Mn, Ce, Tb, Yb, and Sm).
- One or more of nitride, carbide, hydride, or silicide (3) One or more types of Al compounds selected from Al oxides, Al halides, Al nitrides or Al metals; (4) One or a plurality of Si compounds selected from Si nitride, Si oxide, Si oxynitride, and Si metal.
- the compounding ratio of the compounds (1) to (4) may be designed based on the composition ratios a to f.
- a flux may be added to the compounds (1) to (4).
- the flux alkali metal halides, alkaline earth metal halides, Al halides and the like can be used. For example, 0.01 to 20 wt% relative to 100 wt% of the compounds (1) to (4). % Can be added.
- the Me element and the Re element are as described above.
- firing is preferably performed at 1400 ° C. or higher and 1800 ° C. or lower, and more preferably 1500 ° C. or higher and 1700 ° C. or lower, under an atmospheric gas pressure of 1 atm or higher.
- the firing temperature is 1400 ° C. or lower, sufficient reaction between the compounds does not occur, which causes generation of a second phase and a decrease in crystallinity.
- the firing temperature is 1800 ° C. or higher, the fired product becomes a completely sintered body due to the reaction via the liquid phase, and the luminous efficiency is lowered and the crystallinity is lowered by mechanical pulverization or the like performed when powdered.
- the firing step is preferably performed under a pressure of 1 atm or more in a nitrogen atmosphere.
- the holding time at the maximum temperature in the firing step varies depending on the firing temperature, but is usually 1 to 20 hours.
- the annealing process is preferably performed at 1200 ° C. or higher and 1600 ° C. or lower.
- the atmosphere in the annealing step is one or a mixed atmosphere of nitrogen, argon and hydrogen.
- the acidic solution used in the acid treatment step is one or a mixture of two or more of hydrochloric acid, sulfuric acid, and nitric acid, or a mixture thereof diluted with ion-exchanged water.
- the phosphors produced by the production method described above may be mixed with the compounds (1) to (4).
- the proportion of the phosphor added to the raw material can be added within a range of 20 wt% or less with respect to the mixed raw material.
- the light emitting device of the present invention includes a light emitting element and the phosphor of the present invention.
- a light-emitting device may use the phosphor of the present invention and one or more phosphors having an emission peak wavelength longer than that of the phosphor of the present invention.
- the phosphor having an emission peak wavelength longer than that of the phosphor of the present invention is a phosphor having an emission peak in a wavelength region of 485 nm or more.
- SrAlSi 4 N 7 Eu
- (Ca, Sr) AlSiN 3 Eu
- La 2 O 2 S Eu.
- the light emitting element is preferably either an inorganic light emitting element or an organic light emitting element having a light emission of 300 nm or more and 420 nm or less.
- the light emitting element is, for example, an LED element.
- the light emitting device may be a backlight for a liquid crystal TV, a light source device for a projector, a lighting device or a signal device.
- the obtained mixed powder was filled in a crucible made of BN (boron nitride).
- the BN crucible filled with the mixed powder was set in an electric furnace using a graphite heater heating method using a carbon fiber forming body as a heat insulating material, and the mixed powder was fired. Firing is performed by evacuating the heating furnace of the electric furnace with a rotary pump and a diffusion pump, filling nitrogen gas from room temperature to 1 atm, raising the temperature from room temperature to 1600 ° C. at a rate of 500 ° C. per hour, and then at 1600 ° C. for 4 hours. Retained.
- the fired product was pulverized into a phosphor powder.
- the luminous efficiency of the phosphor was measured by the following method.
- the light emitted from the Xe lamp as a light source is divided into 405 nm by a spectroscope to obtain excitation light, and the excitation light is irradiated to the phosphor set in the integrating sphere using an optical fiber, and the fluorescence by the excitation light is obtained.
- the luminescence of the body was observed using MCPD-7000 manufactured by Otsuka Electronics Co., Ltd.
- the relative luminous efficiency shown in Table 1 is a phosphor of Comparative Example 1 (commonly known as a conventional blue phosphor having an oxide base called BAM, and a typical composition is BaMgAl 10 O 17 : Eu, The peak wavelength is 455 nm.) Is a relative value with the luminous efficiency of 100%. Since the phosphors of Examples 1 to 17 and Comparative Examples 2 and 3 are phosphors having high brightness due to spectral characteristics, a relative light emission efficiency of 90% or more is an acceptable value.
- composition ratios a to f of the phosphors were determined based on the analysis values of the phosphor examples.
- Analytical values by ICP are used for Me elements, Re elements, Al and Si cation elements, and analytical values by an oxygen nitrogen analyzer are used for O and N anions. The results are shown in Table 1.
- the phosphor of Example 1 was (Sr, Ba) 0.93 Eu 0.07 Al 2.14 Si 3.25 O 4.47 N 3.40 .
- the phosphor of Example 1 had a relative light emission efficiency of 92% when the light emission efficiency of the commercially available phosphor of Comparative Example 1 was 100%, which was above the acceptable value.
- the emission peak wavelength of the phosphor of Example 1 was in the range of 469 nm ⁇ 8 nm.
- the phosphor of Example 2 is obtained by annealing the phosphor powder of Example 1 at 1200 ° C. for 8 hours in a nitrogen atmosphere (atmospheric pressure).
- the phosphor of Example 2 had a relative luminous efficiency of 97% and was not described in Table 1, but its emission peak wavelength was in the range of 469 nm ⁇ 8 nm. The relative luminous efficiency was improved by annealing.
- the phosphor of Example 3 was obtained by annealing the phosphor powder of Example 1 at 1300 ° C. for 8 hours in a nitrogen atmosphere (atmospheric pressure).
- the phosphor of Example 3 had a relative luminous efficiency of 100% and was not described in Table 1, but its emission peak wavelength was in the range of 469 nm ⁇ 8 nm.
- the relative luminous efficiency was improved by changing the annealing conditions.
- the phosphor of Example 4 was obtained by annealing the phosphor powder of Example 1 at 1400 ° C. for 8 hours in a nitrogen atmosphere (atmospheric pressure).
- the phosphor of Example 4 had a relative luminous efficiency of 107% and was not described in Table 1, but its emission peak wavelength was in the range of 469 nm ⁇ 8 nm.
- the relative luminous efficiency was further improved by changing the annealing conditions.
- the phosphor of Example 5 was obtained by annealing the phosphor powder of Example 1 at 1500 ° C. for 8 hours in a nitrogen atmosphere (atmospheric pressure).
- the phosphor of Example 5 had a relative luminous efficiency of 108% and was not described in Table 1, but its emission peak wavelength was in the range of 469 nm ⁇ 8 nm.
- the relative luminous efficiency was further improved by changing the annealing conditions.
- the phosphor of Example 6 is obtained by subjecting the phosphor powder of Example 1 to acid treatment.
- the phosphor powder produced in Example 1 was added to an acidic solution (liquid temperature 30 ° C.) diluted with ion-exchanged water for 30 to 60 minutes.
- the dilution ratio of nitric acid was 12% by volume.
- the phosphor of Example 6 had a relative emission efficiency of 99% and was not described in Table 1, but its emission peak wavelength was in the range of 469 nm ⁇ 8 nm. By performing the acid treatment, the relative luminous efficiency was improved. The same applies to Examples 7 and 10 and Example 13 described later.
- the phosphor of Example 7 is obtained by performing the same acid treatment process as that of Example 6 on the phosphor powder of Example 2.
- the phosphor of Example 7 had a relative luminous efficiency of 105% and was not described in Table 1, but its emission peak wavelength was in the range of 469 nm ⁇ 8 nm.
- the phosphor of Example 8 is obtained by subjecting the phosphor powder of Example 3 to the same acid treatment process as that of Example 6.
- the phosphor of Example 8 had a relative luminous efficiency of 111% and was not described in Table 1, but its emission peak wavelength was in the range of 469 nm ⁇ 8 nm.
- the phosphor of Example 9 is obtained by subjecting the phosphor powder of Example 4 to the same acid treatment process as that of Example 6.
- the phosphor of Example 9 had a relative luminous efficiency of 115% and was not described in Table 1, but its emission peak wavelength was in the range of 469 nm ⁇ 8 nm.
- the phosphor of Example 10 is obtained by subjecting the phosphor powder of Example 5 to the same acid treatment process as that of Example 6.
- the phosphor of Example 10 had a relative luminous efficiency of 112% and was not described in Table 1, but its emission peak wavelength was in the range of 469 nm ⁇ 8 nm.
- the phosphor of Example 11 was manufactured by the same method as Example 1 except that the Me element was Ba only, and Ba 0.93 Eu 0.07 Al 1.84 Si 2.73 O3 . 49 N 3.17 .
- the phosphor of Example 11 had a relative light emission efficiency of 97% and was not described in Table 1, but its emission peak wavelength was in the range of 469 nm ⁇ 8 nm.
- the phosphor of Example 12 was obtained by annealing the phosphor powder of Example 11 at 1400 ° C. for 8 hours in a nitrogen atmosphere (atmospheric pressure).
- the phosphor of Example 4 had a relative luminous efficiency of 112% and was not described in Table 1, but its emission peak wavelength was in the range of 469 nm ⁇ 8 nm. The relative luminous efficiency was further improved by the annealing treatment.
- the phosphor of Example 13 is obtained by subjecting the phosphor powder of Example 12 to the same acid treatment process as that of Example 6.
- the phosphor of Example 13 had a relative luminous efficiency of 119%, and this relative luminous efficiency was the highest value in the examples.
- the emission peak wavelength was in the range of 469 nm ⁇ 8 nm.
- the phosphor of Example 14 was (Sr, Ba) 0.93 Eu 0.07 Al 2.06 Si 3.94 O 3.92 N 4.23 .
- the phosphor of Example 14 had a relative luminous efficiency of 91% and was not described in Table 1, but its emission peak wavelength was in the range of 469 nm ⁇ 8 nm.
- the phosphor of Example 15 was manufactured by the same method as in Example 1 except that the Me element was only Sr. Sr 0.92 Eu 0.08 Al 2.09 Si 3.03 O 4. It was 31 N 3.32 .
- the phosphor of Example 11 had a relative luminous efficiency of 93% and was not described in Table 1, but its emission peak wavelength was in the range of 469 nm ⁇ 8 nm.
- the phosphor of Example 16 was (Sr, Ba) 0.98 Eu 0.02 Al 1.90 Si 2.90 O 3.66 N 3.18 .
- the phosphor of Example 16 had a relative emission efficiency of 90% and was not described in Table 1, but its emission peak wavelength was in the range of 469 nm ⁇ 8 nm.
- the phosphor of Example 17 was (Sr, Ba) 0.90 Eu 0.10 Al 2.15 Si 3.09 O 4.90 N 3.16 .
- the phosphor of Example 17 had a relative luminous efficiency of 92% and was not described in Table 1, but its emission peak wavelength was in the range of 469 nm ⁇ 8 nm.
- the phosphor of Comparative Example 2 is (Sr, Ba) 0.92 Eu 0.08 Al 1.58 Si 2.42 O 3.61 N 2.57 , and the composition ratio c, d in Al, Si, N , F are not included in the ratio range of the present invention.
- the phosphor of Comparative Example 2 had a relative luminous efficiency of 31% and was less than the acceptable value.
- the phosphor of Comparative Example 3 is (Sr, Ba) 0.92 Eu 0.08 Al 2.72 Si 4.09 O 5.01 N 4.59 , and the composition ratio c in Al, Si, O, and N , D, e, and f were not included in the ratio range of the present invention.
- the phosphor of Comparative Example 3 had a relative luminous efficiency of 74%, which was less than the acceptable value.
- the emission peak wavelengths of the phosphors of Examples 1 to 17 were shifted to the longer wavelength side than the emission peak value of the blue phosphor of Comparative Example 1, and were blue with higher brightness. While the relative luminous efficiencies of the phosphors of Examples 1 to 17 are all equal to or higher than the acceptable values, the numerical values of the compositions a to f are limited, particularly the relative phosphors of Comparative Examples 2 and 3 that do not satisfy c to f. The luminous efficiency was less than the acceptable value.
- Table 2 shows the production conditions of the examples.
- FIG. 1 shows emission spectra of the phosphors of Comparative Example 1 and Examples 1, 4, 6, 9, 13, and 16 of the present invention.
- FIG. 2 shows the measurement results of the excitation spectra of the phosphors of Comparative Example 1 and Examples 1, 4, 6, 9, 13, and 16 of the present invention.
- the vertical axis in FIG. 1 is the intensity standardized so that the peak values of the emission spectra of the phosphors of Comparative Example 1 and Examples 1, 4, 6, 9, 13, and 16 are 1.
- the phosphor of the present invention has a longer emission peak wavelength than the commercially available phosphor of Comparative Example 1. That is, while the emission peak wavelength of Comparative Example 1 is 456 nm, the emission peak wavelengths of Examples 1, 4, 6, 9, 13, and 16 are in the range of 469 nm ⁇ 8 nm. Since the phosphor of the present invention has a wider emission band width than that of the phosphor of Comparative Example 1 and contains a large amount of visible light in a wavelength range with good visibility, the phosphor has a relatively strong brightness.
- the vertical axis in FIG. 2 is the intensity normalized so that the peak values of the excitation spectra of Comparative Example 1 and Examples 1, 4, 6, 9, 13, and 16 are 1.
- the phosphor of the present invention had a substantially flat excitation intensity from a wavelength of about 250 nm to about 430 nm. Compared with the phosphor of Comparative Example 1, the phosphors of Examples 1, 4, 6, 9, 13, and 16 of the present invention could be efficiently excited by light in the near ultraviolet region having a wavelength of 380 to 420 nm. From this result, it can be seen that the phosphor of the present invention efficiently emits light by the near ultraviolet light emitting diode.
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Abstract
Description
本発明者らは、サイアロンの結晶構造と希土類元素の関係について研究をすすめたところ、サイアロンの結晶構造と希土類元素が特定の条件を満たす時に、従来知られている青色蛍光体とは異なる発光ピーク波長を有する明度の高い青色蛍光体となることを見出し、本発明を完成するに至った。
すなわち、本発明は、従来の青色蛍光体とは異なる発光ピーク波長を有する青色蛍光体とその製造方法、及び、その蛍光体を用いた高輝度な発光装置を提供することを目的とする。
a+b=1
0.005<b<0.25
1.60<c<2.60
2.45<d<4.05
3.05<e<5.00
2.75<f<4.40
(1)Meで示される元素(ただし、MeはSr及びBaから選ばれる一種以上の元素である。)の炭酸塩、酸化物、窒化物、炭化物、水素化物又は珪化物の一種又は複数種;
(2)Reで示される元素(ただし、ReはEuからなる。)の炭酸塩、酸化物、ハロゲン化物、窒化物、炭化物、水素化物又は珪化物の一種又は複数種;
(3)Al酸化物、Alハロゲン化物、Al窒化物又はAl金属から選ばれるAl化合物の一種又は複数種;
(4)Si窒化物、Si酸化物、Si酸窒化物及びSi金属から選ばれるSi化合物の一種又は複数種。
a+b=1
0.005<b<0.25
1.60<c<2.60
2.45<d<4.05
3.05<e<5.00
2.75<f<4.40
また、MeはSr、Ba以外に、Mg、Ca、Sc、Y及びLaから選ばれる元素の一種以上さらに含んでもよい。
上記組成比c乃至fの条件は、1.83<c<2.20;2.73<d<3.50;3.28<e<4.90;3.12<f<4.23であることがさらに好ましい。
(1)Meで示される元素(ただし、MeはSr及びBaから選ばれる一種以上の元素であり、Mg,Ca,Sc,Y,Laから選ばれる元素の一種以上をさらに含んでもよい。)の炭酸塩、酸化物、窒化物、炭化物、水素化物、又は珪化物の一種又は複数種;
(2)Reで示される元素(ただし、ReはEuからなり、Mn,Ce,Tb,Yb,Smから選ばれる元素の一種以上をさらに含んでもよい。)の炭酸塩、酸化物、ハロゲン化物、窒化物、炭化物、水素化物、又は珪化物の一種又は複数種;
(3)Al酸化物、Alハロゲン化物、Al窒化物又はAl金属から選ばれるAl化合物の一種又は複数種;
(4)Si窒化物、Si酸化物、Si酸窒化物、Si金属から選ばれるSi化合物の一種又は複数種である。
光源となるXeランプから放射される光を分光器によって405nmに分光して励起光を得て、光ファイバーを用いて積分球内にセットされた蛍光体に励起光を照射し、その励起光による蛍光体の発光を、大塚電子株式会社製MCPD-7000を用いて観測した。
表1に記載の相対発光効率は、比較例1の蛍光体(通称、BAMといわれる酸化物母体を有する従来の青色蛍光体であり、代表的な組成は、BaMgAl10O17:Euであり、ピーク波長は、455nmである。)の発光効率を100%とした相対値である。実施例1乃至17、比較例2及び3の蛍光体はスペクトルの特徴から明度の高い蛍光体であるので、相対発光効率は90%以上が合格値である。
実施例1乃至17の蛍光体の相対発光効率は、いずれも合格値以上であるのに対し、組成a乃至fの数値限定、特にc乃至fを満たさない比較例2及び3の蛍光体の相対発光効率は合格値未満であった。
Claims (12)
- 一般式:MeaRebAlcSidOeNf(ただし、MeはSr及びBaから選ばれる一種以上の元素であり、ReはEuである。)で示される蛍光体であって、組成比a、b、c、d、e及びfが次の関係を有する蛍光体。
a+b=1
0.005<b<0.25
1.60<c<2.60
2.45<d<4.05
3.05<e<5.00
2.75<f<4.40 - 前記組成比c、d、e及びfが、次の関係を有する請求項1に記載の蛍光体。
0.500<c/d<0.720
0.900<e/f<1.570 - 波長300nm以上420nm以下の光によって励起され、波長450nm以上485nm以下に発光ピーク波長を有する請求項1又は請求項2に記載の蛍光体。
- 請求項1に記載の蛍光体を製造する蛍光体の製造方法であって、下記に示す(1)乃至(4)の化合物を混合する混合工程と、混合工程後の混合物を焼成する焼成工程と、焼成工程後にアニール処理するアニール工程と、アニール工程後に酸処理する酸処理工程と、を含む蛍光体の製造方法。
(1)Meで示される元素(ただし、MeはSr及びBaから選ばれる一種以上の元素である。)の炭酸塩、酸化物、窒化物、炭化物、水素化物又は珪化物の一種又は複数種。
(2)Reで示される元素(ただし、ReはEuである。)の炭酸塩、酸化物、ハロゲン化物、窒化物、炭化物、水素化物又は珪化物の一種又は複数種。
(3)Al酸化物、Alハロゲン化物、Al窒化物又はAl金属から選ばれるAl化合物の一種又は複数種。
(4)Si窒化物、Si酸化物、Si酸窒化物及びSi金属から選ばれるSi化合物の一種又は複数種。 - 前記焼成工程において、1気圧以上の雰囲気ガスの圧力下、1400℃以上1800℃以下の温度で焼成する請求項4に記載の蛍光体の製造方法。
- 前記アニール工程において、1200℃以上1600℃以下の温度でアニール処理する請求項4又は請求項5に記載の蛍光体の製造方法。
- 請求項1に記載の蛍光体を製造する蛍光体の製造方法であって、下記に示す(1)乃至(4)の化合物と、請求項5で得られた蛍光体とを混合する混合工程と、混合工程後の混合物を焼成する焼成工程と、焼成工程後にアニール処理するアニール工程と、アニール工程後に酸処理する酸処理工程とを含む蛍光体の製造方法。
(1)Meで示される元素(ただし、MeはSr及びBaから選ばれる一種以上の元素である。)の炭酸塩、酸化物、窒化物、炭化物、水素化物又は珪化物の一種又は複数種。
(2)Reで示される元素(ただし、ReはEuである。)の炭酸塩、酸化物、ハロゲン化物、窒化物、炭化物、水素化物又は珪化物の一種又は複数種。
(3)Al酸化物、Alハロゲン化物、Al窒化物又はAl金属から選ばれるAl化合物の一種又は複数種。
(4)Si窒化物、Si酸化物、Si酸窒化物及びSi金属から選ばれるSi化合物の一種又は複数種。 - 発光素子と、請求項1乃至請求項3のいずれか一項に記載の蛍光体とを備える発光装置。
- 発光素子と、請求項1乃至請求項3のいずれか一項に記載の蛍光体と、請求項1乃至請求項3のいずれか一項に記載の蛍光体より長波長の発光ピーク波長を有する一種以上の蛍光体とをさらに備える発光装置。
- 前記発光素子が、340nm以上450nm以下の発光を有する無機発光素子又は有機発光素子のいずれかである請求項8に記載の発光装置。
- 前記発光素子が、LED素子である請求項8に記載の発光装置。
- 前記発光装置が、液晶TV用バックライト、プロジェクタの光源装置、照明装置又は信号装置である請求項8に記載の発光装置。
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WO2015093429A1 (ja) * | 2013-12-17 | 2015-06-25 | 電気化学工業株式会社 | 蛍光体、発光装置及びその製造方法 |
CN105694870A (zh) * | 2016-03-17 | 2016-06-22 | 常州工程职业技术学院 | 一种Eu3+激活的正硅酸镁钠红色荧光粉及其制备方法和应用 |
CN105694870B (zh) * | 2016-03-17 | 2018-08-07 | 常州工程职业技术学院 | 一种Eu3+激活的正硅酸镁钠红色荧光粉及其制备方法和应用 |
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CN103998571A (zh) | 2014-08-20 |
TWI521046B (zh) | 2016-02-11 |
KR20140090559A (ko) | 2014-07-17 |
KR101484429B1 (ko) | 2015-01-19 |
EP2767573A4 (en) | 2015-05-06 |
JP5557360B1 (ja) | 2014-07-23 |
JPWO2014091776A1 (ja) | 2017-01-05 |
EP2767573B1 (en) | 2016-09-28 |
EP2767573A1 (en) | 2014-08-20 |
TW201422778A (zh) | 2014-06-16 |
CN103998571B (zh) | 2016-03-23 |
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