WO2017006725A1 - 青緑色発光蛍光体、発光素子、発光装置、及び白色光発光装置 - Google Patents
青緑色発光蛍光体、発光素子、発光装置、及び白色光発光装置 Download PDFInfo
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- WO2017006725A1 WO2017006725A1 PCT/JP2016/067792 JP2016067792W WO2017006725A1 WO 2017006725 A1 WO2017006725 A1 WO 2017006725A1 JP 2016067792 W JP2016067792 W JP 2016067792W WO 2017006725 A1 WO2017006725 A1 WO 2017006725A1
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 222
- 229910052788 barium Inorganic materials 0.000 claims abstract description 54
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims abstract description 19
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052736 halogen Inorganic materials 0.000 claims abstract description 16
- 150000002367 halogens Chemical class 0.000 claims abstract description 16
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 8
- 239000000460 chlorine Substances 0.000 claims description 83
- 229910052712 strontium Inorganic materials 0.000 claims description 50
- 229910052791 calcium Inorganic materials 0.000 claims description 43
- 238000009877 rendering Methods 0.000 claims description 37
- 229910052749 magnesium Inorganic materials 0.000 claims description 18
- 229910052710 silicon Inorganic materials 0.000 claims description 9
- 229910004283 SiO 4 Inorganic materials 0.000 claims description 8
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 6
- MCSXGCZMEPXKIW-UHFFFAOYSA-N 3-hydroxy-4-[(4-methyl-2-nitrophenyl)diazenyl]-N-(3-nitrophenyl)naphthalene-2-carboxamide Chemical compound Cc1ccc(N=Nc2c(O)c(cc3ccccc23)C(=O)Nc2cccc(c2)[N+]([O-])=O)c(c1)[N+]([O-])=O MCSXGCZMEPXKIW-UHFFFAOYSA-N 0.000 claims description 5
- 229910052688 Gadolinium Inorganic materials 0.000 claims description 5
- 229910052746 lanthanum Inorganic materials 0.000 claims description 5
- 229910052706 scandium Inorganic materials 0.000 claims description 5
- 229910052727 yttrium Inorganic materials 0.000 claims description 5
- 229910017639 MgSi Inorganic materials 0.000 claims description 4
- 229910000789 Aluminium-silicon alloy Inorganic materials 0.000 claims description 3
- 229910052765 Lutetium Inorganic materials 0.000 claims description 3
- 229910020068 MgAl Inorganic materials 0.000 claims description 3
- YMUAXKYTHNCMAS-UHFFFAOYSA-N [butyl(nitroso)amino]methyl acetate Chemical compound CCCCN(N=O)COC(C)=O YMUAXKYTHNCMAS-UHFFFAOYSA-N 0.000 claims description 3
- 239000012190 activator Substances 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 229910052801 chlorine Inorganic materials 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 229910052771 Terbium Inorganic materials 0.000 claims description 2
- 125000001309 chloro group Chemical group Cl* 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 150000004767 nitrides Chemical class 0.000 claims description 2
- 229910052723 transition metal Inorganic materials 0.000 claims description 2
- 150000003624 transition metals Chemical class 0.000 claims description 2
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 150000002222 fluorine compounds Chemical class 0.000 claims 1
- 230000001747 exhibiting effect Effects 0.000 abstract description 5
- 230000003190 augmentative effect Effects 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 238000002441 X-ray diffraction Methods 0.000 description 42
- 239000002994 raw material Substances 0.000 description 41
- 230000000052 comparative effect Effects 0.000 description 36
- 101100496858 Mus musculus Colec12 gene Proteins 0.000 description 34
- 239000000203 mixture Substances 0.000 description 29
- 238000002156 mixing Methods 0.000 description 20
- 239000011347 resin Substances 0.000 description 17
- 229920005989 resin Polymers 0.000 description 17
- 239000013078 crystal Substances 0.000 description 13
- 150000001342 alkaline earth metals Chemical class 0.000 description 12
- 239000000126 substance Substances 0.000 description 12
- 150000001875 compounds Chemical class 0.000 description 11
- 238000000295 emission spectrum Methods 0.000 description 11
- 238000004846 x-ray emission Methods 0.000 description 11
- 239000000470 constituent Substances 0.000 description 10
- 229910052693 Europium Inorganic materials 0.000 description 8
- 229910003564 SiAlON Inorganic materials 0.000 description 5
- 238000013329 compounding Methods 0.000 description 5
- OGPBJKLSAFTDLK-UHFFFAOYSA-N europium atom Chemical compound [Eu] OGPBJKLSAFTDLK-UHFFFAOYSA-N 0.000 description 5
- 238000005286 illumination Methods 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 5
- 230000005284 excitation Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 239000012298 atmosphere Substances 0.000 description 3
- 239000003086 colorant Substances 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- -1 organic acid salts Chemical class 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004254 Ammonium phosphate Substances 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-L Phosphate ion(2-) Chemical class OP([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-L 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000005260 alpha ray Effects 0.000 description 1
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 1
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 description 1
- 229910000148 ammonium phosphate Inorganic materials 0.000 description 1
- 235000019289 ammonium phosphates Nutrition 0.000 description 1
- RQPZNWPYLFFXCP-UHFFFAOYSA-L barium dihydroxide Chemical compound [OH-].[OH-].[Ba+2] RQPZNWPYLFFXCP-UHFFFAOYSA-L 0.000 description 1
- 229910001863 barium hydroxide Inorganic materials 0.000 description 1
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 230000006690 co-activation Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229910000388 diammonium phosphate Inorganic materials 0.000 description 1
- 235000019838 diammonium phosphate Nutrition 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 150000004673 fluoride salts Chemical class 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical class [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 235000019837 monoammonium phosphate Nutrition 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- ORFSSYGWXNGVFB-UHFFFAOYSA-N sodium 4-amino-6-[[4-[4-[(8-amino-1-hydroxy-5,7-disulfonaphthalen-2-yl)diazenyl]-3-methoxyphenyl]-2-methoxyphenyl]diazenyl]-5-hydroxynaphthalene-1,3-disulfonic acid Chemical compound COC1=C(C=CC(=C1)C2=CC(=C(C=C2)N=NC3=C(C4=C(C=C3)C(=CC(=C4N)S(=O)(=O)O)S(=O)(=O)O)O)OC)N=NC5=C(C6=C(C=C5)C(=CC(=C6N)S(=O)(=O)O)S(=O)(=O)O)O.[Na+] ORFSSYGWXNGVFB-UHFFFAOYSA-N 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
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- 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
- C09K11/7737—Phosphates
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- C09K11/70—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing phosphorus
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- C09K11/72—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing phosphorus also containing halogen, e.g. halophosphates
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- C09K11/7795—Phosphates
- C09K11/7796—Phosphates with alkaline earth metals
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- H—ELECTRICITY
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- H01L33/50—Wavelength conversion elements
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- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
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- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Definitions
- the present invention relates to a phosphor that emits blue-green visible light when excited by near ultraviolet rays, and more particularly, to a blue-green phosphor that has excellent emission characteristics, and a light-emitting element, a light-emitting device, and a white light-emitting device using the blue-green light-emitting phosphor.
- Fluorescent substances are widely used in various industries depending on the emission wavelength because of the feature of showing various emission wavelengths for each type.
- white light can be obtained in principle by mixing phosphors that exhibit the three primary colors of light (red, blue, and green). In order to obtain illumination, white light with higher color rendering properties is required. Therefore, there is a need for a phosphor that can broadly emit light of the emission color in the intermediate region of the three primary colors of light.
- blue-green light-emitting phosphor that emits blue-green visible light in the middle region of blue and green as one that is currently in high demand. Since the blue-green light emitting phosphor emits blue-green visible light, it is important as a phosphor that compensates for the valley of the emission spectrum between the blue and green wavelength regions. Furthermore, if there is sufficient intensity and half width, it is possible to replace the blue phosphor and realize white light illumination with higher color rendering.
- a blue-green light-emitting phosphor As such a blue-green light-emitting phosphor, a halophosphate phosphor containing alkaline earth metal, phosphoric acid, halogen, and europium as constituent elements is known. There were many points to be improved with respect to the light emission characteristics that the high temperature characteristics were insufficient and the half width was narrow.
- various phosphors aimed at improving the light emission characteristics can be obtained by adding a particularly high content of strontium (Sr) among alkaline earth metals as constituent elements. Proposed.
- the ratio of Sr: M is a: b (a and b are a + b ⁇ 5 and a ⁇ 0. 1 or b ⁇ 3 is satisfied) (see Patent Documents 1 and 2).
- phosphors emit strong light even under high temperature conditions (for example, high temperature conditions exceeding 100 ° C.). It is necessary to maintain strength (wide light emitting area), that is, excellent high temperature characteristics.
- the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a blue-green light-emitting phosphor that exhibits excellent high-temperature characteristics and excellent luminance and half-value emission characteristics.
- the present inventors have focused on barium (Ba) belonging to alkaline earth metal as a constituent element of the halophosphate phosphor, and the blending ratio is a ratio that has not existed in the past and within a certain range. It was found that the phosphor formed with a significantly higher intensity emits broad blue-green visible light that exhibits high temperature characteristics, brightness, and half-value width superior to those of conventional phosphors when irradiated with near ultraviolet rays. It was.
- the blue-green light-emitting phosphor disclosed in the present application is composed of a plurality of alkaline earth metal elements including barium element, Eu and activator, phosphoric acid, and halogen elements. It is a phosphor whose constituent molar ratio of barium element occupies the whole is larger than 60% and smaller than 95%, and emits blue-green visible light when irradiated with near-ultraviolet light and excited by irradiation of the near-ultraviolet light. is there.
- the blue-green light-emitting phosphor disclosed in the present application may have a general formula Ba b (Sr, Ca, Mg) c (PO 4 ) d X e : Eu a (X is a halogen element, and 0 ⁇ a ⁇ 1.5, 3.5 ⁇ b ⁇ 8.5, 0 ⁇ c ⁇ 5.9, 5.4 ⁇ d ⁇ 6.6, 1.8 ⁇ e ⁇ 2.2, 0.6 ⁇ b / (B + c) ⁇ 0.95).
- a light emitting element disclosed in the present application includes the blue-green light emitting phosphor.
- the light-emitting device disclosed in the present application includes the blue-green light-emitting phosphor.
- the white light-emitting device disclosed in the present application includes the blue-green light-emitting phosphor, the red phosphor, and the green phosphor, and can further include a blue phosphor as necessary. is there.
- the white light emitting device disclosed in the present application includes a first phosphor composed of the blue-green light emitting phosphor, which emits blue-green light of 430 to 500 nm, and a green color of 500 to 580 nm.
- the first phosphor, the second phosphor, and the third phosphor are excited directly or indirectly by light to emit light to emit white light.
- 3 is an X-ray diffraction pattern of the phosphors of Examples 1 to 3 of the present invention.
- 4 is an X-ray diffraction pattern of phosphors of Examples 4 to 6 of the present invention.
- 3 is an X-ray diffraction pattern of phosphors of Comparative Examples 1 to 3.
- FIG. 7 is an X-ray diffraction pattern of phosphors of Comparative Examples 4 to 7.
- FIG. It is the light emission characteristics obtained from the phosphors of Examples 1 to 3 of the present invention. It is the light emission characteristics obtained from the phosphors of Examples 4 to 6 of the present invention. It is the light emission characteristics obtained from the phosphors of Examples 7 to 9 of the present invention.
- FIG. 3 is a chromaticity range diagram of blue-green light-emitting phosphors obtained in Examples 1 to 17 of the present invention. It is a light emission spectrum figure of the illuminating device comprised combining the blue-green light emission fluorescent substance obtained in Example 4 and 17 of this invention, and another fluorescent substance. It is explanatory drawing for demonstrating the structure of the white light-emitting device using the blue-green light-emitting fluorescent substance of this invention. It is the X-ray-diffraction pattern (a) and light emission characteristic (b) of the fluorescent substance (J18) of this invention. It is the result of having measured the color rendering property of the white light-emitting device using the blue-green light emission fluorescent substance of this invention. It is a result of the emission spectrum of the white light-emitting device using the blue-green light-emitting fluorescent substance of this invention.
- the blue-green phosphor according to the present invention is composed of a plurality of alkaline earth metal elements including barium element, phosphoric acid, and halogen elements using Eu as an activator. It is a phosphor having a molar ratio of barium element that is larger than 60% and smaller than 95%, which emits near-ultraviolet rays and is excited by the near-ultraviolet rays to emit blue-green visible light.
- Near-ultraviolet rays irradiated as an excitation source are not particularly limited as long as they are ordinary near-ultraviolet regions having a wavelength of 200 nm or more.
- near-ultraviolet rays having a wavelength region of 370 nm to 420 nm can be used.
- the blue-green light-emitting phosphor according to the present invention emits blue-green visible light having a broad emission spectrum having a high color rendering property having an emission peak in a wavelength region of 470 nm to 490 nm when irradiated with near-ultraviolet rays.
- the blue-green light emitting phosphor according to the present invention emits blue-green visible light having a broad emission spectrum, it is combined with other known phosphors as a white light source close to sunlight. It can be used as a light emitting element or a light emitting device.
- such broad blue-green visible light can be obtained together with excellent temperature characteristics (high temperature characteristics), but the molar ratio of the barium element in the entire alkaline earth metal element is 60 % Or less and more than 95% of conventional phosphors (all of the phosphors disclosed in Patent Documents 1 to 6 described above have a barium element molar ratio of 60% or less).
- the present inventor has also confirmed that the characteristics cannot be obtained (see Examples described later).
- the emission area of the phosphor does not vary at a low value, but from 60%
- the emission area of the phosphor rapidly increases as the molar ratio of the barium element increases.
- the molar ratio of the barium element is larger than 95%
- the light emission area of the phosphor is rapidly decreased. It has been confirmed that the blue-green light-emitting phosphor according to the present invention exhibits high heat resistance because a decrease in emission intensity due to heat is suppressed even under high temperature conditions (see Examples described later).
- the mechanism for producing such an excellent effect has not yet been elucidated in detail, but the molar ratio of the barium element contained in the constituent elements of the blue-green light emitting phosphor according to the present invention is larger than 60% and smaller than 95%. Therefore, it is speculated that the highly compounded barium element has an interaction with other alkaline earth metal elements that has a favorable effect on light emission at the interatomic level. It is inferred that the crystal structure is formed.
- the crystal structure when the molar ratio of the barium element to the whole of the alkaline earth metal element is 60% or less, the 2 ⁇ value of the X-ray diffraction pattern is near (30 °) and the (211) plane , (112) plane, and a crystal phase (SCA phase: crystal structure mainly composed of Sr) exhibiting three diffraction peaks derived from the (300) plane, while the molar ratio of the barium element is 60%
- SCA phase crystal structure mainly composed of Sr
- BCA phase crystal structure mainly composed of Ba
- the crystal structure is changed. It has been confirmed that this has occurred (see examples described later).
- X is a halogen element, 0 ⁇ A ⁇ 1.5, 9.5 ⁇ a + b + c ⁇ 10.5, 5.4 ⁇ d ⁇ 6.6, 1.8 ⁇ e ⁇ 2.2, 0.6 ⁇ b / (b + c) ⁇ 0.95 ).
- composition ratio of each constituent element represented by the above general formula is determined from the raw material molar composition ratio of the starting material. That is, a, b, c, d, and e defined in the above general formula are respectively the raw material molar compositions of Eu, Ba, (Sr, Ca, Mg), (PO 4 ), and X in the starting material. Represents the ratio.
- the above notation (Sr, Ca, Mg) indicates that at least one element of Sr, Ca, and Mg is contained. That is, the notation (Sr, Ca, Mg) may include any one element of Sr, Ca, and Mg, and may include two types of elements of Sr, Ca, and Mg. Yes, indicating that all elements of Sr, Ca and Mg may be included.
- the blue-green light emitting phosphor according to the present invention preferably contains Ca and Mg from the viewpoint of promoting broadening of the light emitting region.
- containing Ca has also contributed to a decrease in temperature characteristics.
- the temperature it is possible to exhibit an excellent characteristic that broadening can be promoted while maintaining the characteristic.
- 50 mol% or more of the halogen elements constituting the blue-green light emitting phosphor according to the present invention is a chlorine element.
- 50 mol% or more of the halogen element is a chlorine element, the emission characteristics are improved so as to ensure a good emission area and chromaticity region.
- the blue-green light emitting phosphor according to the present invention is one or more selected from the group consisting of rare earths and transition metals composed of Sc, Y, La, Gd, Tb, Lu, Pr, Ce, Cr, V, Mn, and Zn. It is preferable that the co-activation element is included. By containing such a co-activating element, it is possible to improve the full width at half maximum and the maximum excitation wavelength and generate a good chromaticity region.
- the blue-green light emitting phosphor according to the present invention contains 10 to 90% by weight of the above blue-green light emitting phosphor, and BaMgAl 10 O 17 : Eu, (Ba, Sr) 3 MgSi 3 O 8 : Eu, Sr 10 (PO 4 ) 6 Cl 2 : Eu, Sr 2 P 2 O 7 : Eu, Ca 2 PO 4 Cl: Eu, Ba 2 PO 4 Cl: Eu, (Ba, Sr) 2 SiO 4 : Eu, and (Ba , Sr, Ca) Al 2 O 4 : Eu can be configured to include one or more phosphors selected from the group of blue phosphors and green phosphors.
- the method for synthesizing the blue-green light emitting phosphor according to the present invention having such excellent characteristics is not particularly limited.
- the Eu source, the alkaline earth source, the phosphorus source, and the halogen source of the light emission center are dry or wet. It can be manufactured by uniformly mixing using a method and firing it in a reducing atmosphere.
- a compound containing at least one constituent element for example, Ba, Sr, Ca, Mg, P, halogen element, and Eu
- the blue-green light emission fluorescent substance of the desired component element may be obtained (so that a component element may not leak), there will be no restriction
- an oxide, hydroxide, carbide or the like containing a constituent element of a blue-green light emitting phosphor can be used as an example of such a raw material compound.
- barium which is one of the constituent elements of a blue-green light emitting phosphor
- barium oxide, barium hydroxide, barium carbonate, or the like can be used as one of the raw material compounds.
- each raw material compound is heat-treated, so that only the constituent elements remain from the respective raw material compounds by the heat treatment. This is because the blue-green light emitting phosphor according to the present invention is formed without depending on the type.
- Eu sources and alkaline earth sources include Eu, Ba, Sr, Ca, Mg oxides, hydroxides, carbonates, sulfates, nitrates, organic acid salts, and halogen acid salts.
- the phosphorus source include ammonium phosphate, ammonium dihydrogen phosphate, ammonium monohydrogen phosphate, alkaline earth salts of phosphoric acid, alkaline earth salts of hydrogen phosphate, phosphorous oxide, phosphoric acid, condensed phosphoric acid and the like.
- the halogen source include halogenated alkaline earth salts, halogenated alkaline earth hydrates, ammonium halides and the like.
- a self-flux reaction can be synthesized as a main reaction. That is, the halogen source, which is a raw material compound, becomes a flux for the firing reaction, and the excellent characteristics of the present invention are easily obtained by adding each raw material compound excessively within a range that does not impair the excellent effects of the present invention. It is desirable to determine in advance the composition of the composite due to the excess.
- anhydrous BaCl 2 and SrCl 2 can be used so that excellent characteristics can be easily obtained.
- the raw material compound is not limited thereto, and for example, a hydrate can also be used.
- the blue-green light-emitting phosphor according to the present invention can also be used as a light-emitting element including the blue-green light-emitting phosphor.
- the blue-green light-emitting phosphor according to the present invention can also be used as a light-emitting device including the blue-green light-emitting phosphor.
- the blue-green light-emitting phosphor according to the present invention can be used as a white light-emitting device including the blue-green light-emitting phosphor, the red phosphor, and the green phosphor. It has been confirmed that a broad white light with high brightness can be obtained.
- the wavelength band and wavelength intensity of the blue green light emitting phosphor can be adjusted. Therefore, the color temperature of the obtained white light can be freely adjusted.
- the adjustment for example, even the same white light can be selectively obtained from white light close to a bluish fluorescent color to white light close to an orange light bulb color.
- the light emitting device according to the present invention can be configured to include the blue-green light emitting phosphor according to the present invention and a light emitting element that emits near ultraviolet light.
- the blue-green light emitting phosphor according to the present invention is irradiated with near-ultraviolet light from a light-emitting element that emits near-ultraviolet light, an apparatus that efficiently emits blue-green visible light is formed.
- the use of such a light emitting device according to the present invention is not particularly limited, and can be used in a wide range of fields.
- the light emitting device can be used as various lighting fixtures such as a plant growing lighting fixture.
- a first phosphor composed of a blue-green light emitting phosphor according to the present invention, which is a blue-green light emitting phosphor emitting blue-green at 430 to 500 nm.
- the first phosphor, the second phosphor, and the third phosphor are directly or indirectly excited by the light from the LED element to emit light and emit white light. can do.
- the blue-green light-emitting phosphor obtained in each of the above examples can be used.
- the second phosphor is not particularly limited as long as it is a phosphor that emits light in the green wavelength band, but includes an Eu-activated alkaline earth silicate phosphor or an alkaline earth silicate nitride phosphor.
- Eu alkaline earth silicate
- Alkaline earth silicate nitride phosphor For example, (Ba, Sr, Ca, Mg) 2 SiO 4 : Eu (BOSE), Si 6-z Al z O z N 8-z ( ⁇ sialon), (Ba, Sr) Si 2 O 2 N 2 , (Ba, Sr, Ca) MgAl 10 O 17 : Eu 2+ , Mn 2+ (BAMN), (Ca, Sr) 8 Mg (SiO 4 ) 4 Cl 2 : Eu, and the like.
- the third phosphor is not particularly limited as long as it is a phosphor that emits light in the red to deep red wavelength band, but Eu-activated alkaline earth oxynitride phosphor, Eu-activated alkaline earth silicate phosphor.
- Mn-activated fluoride complex red phosphors for example, (Ba, Sr, Ca) 3 SiO 5 : Eu (for example, Sr 3 SiO 5 : Eu (SSE) ), (Ba, Sr, Ca) 2 (Si, Al) 5 N 8 : Eu, (Ca, Sr) AlSi (O, N) 3 , (Sr, Ca) AlN 3 : Eu (SCASN), K 2 ( Si, Ge, Ti) F 6 : Mn 4+ (KSF), Li (Eu, RE) W 2 O 8 (RE includes at least one of Sc, Y, La, Gd, Lu) (LEW ) And the like.
- Mn-activated fluoride complex red phosphors for example, (Ba, Sr, Ca) 3 SiO 5 : Eu (for example, Sr 3 SiO 5 : Eu (SSE) ), (Ba, Sr, Ca) 2 (Si, Al) 5 N 8 : Eu, (Ca, Sr)
- Such a white light emitting device has been confirmed to exhibit high color rendering properties, and is excellent in that the average color rendering index (Ra) or the color rendering index (CRI) is 95 or more quantitatively. It has been confirmed that it has the characteristics.
- Color rendering is a measure of the influence of the light source spectrum on the color appearance of an object. Color rendering can be evaluated quantitatively by quantifying the deviation from sunlight (sunlight is the reference value). 100). That is, the average color rendering index (Ra) or the color rendering index (CRI) is evaluated to be higher as the color rendering property approaches 100. Since the white light emitting device according to the present invention has such excellent characteristics, it can be widely used as a light source for a backlight having a high color gamut and a light source for illumination having a high color rendering.
- the white light emitting device does not require a separate light source that emits blue light, and the white light according to the degree of the blue-green component contained in the blue-green light emitting phosphor (BCA) according to the present invention.
- the white color device has an excellent characteristic. That is, the conventional blue-green light-emitting phosphor has been considered as an application to supplement the blue-green color of the white light-emitting device, but the blue-green light-emitting phosphor according to the present invention can replace the blue phosphor itself. Is.
- the white light emitting device according to the present invention can further use another blue phosphor.
- pure blue by the blue phosphor and blue-green light emitting fluorescence according to the present invention are used.
- White light closer to sunlight can be obtained by combining the blue-green color by the body in a superimposed manner.
- the white light emitting device according to the present invention can create a new blue-green color by controlling the blending ratio of blue and blue-green, and can also produce white light sources with various color temperatures. (Refer to Examples described later).
- Example 1 As raw materials, Eu 2 O 3 , BaCO 3 , SrCO 3 , BaHPO 4 , SrHPO 4 , BaCl 2 , SrCl 2 are used in a final Eu: Ba: Sr: P: Cl molar ratio of 0.5: 8.0: 1.5: 6: Weighed to 2 and mixed using a mortar. Put this mixture in an alumina crucible, hold it in an electric furnace at 900 ° C in the atmosphere for 2 hours, crush and screen, and then hold it in a nitrogen atmosphere containing 5% hydrogen gas at 1150 ° C for 5 hours Was fired.
- the fired product was washed with water, dried and classified, and a blue-green light emitting phosphor corresponding to Eu 0.5 Ba 8.0 Sr 1.5 (PO 4 ) 6 Cl 2 was obtained.
- the X-ray diffraction pattern was measured using an X-ray diffractometer (XRD6100, manufactured by Shimadzu Corp.) with a CuK ⁇ ray as a radiation source. Luminescence characteristics by excitation at 400 nm were measured with a fluorescence spectrophotometer (FP6500, manufactured by JASCO).
- Example 2 As raw materials, Eu 2 O 3 , BaCO 3 , SrCO 3 , BaHPO 4 , SrHPO 4 , BaCl 2 , SrCl 2 are used in a final Eu: Ba: Sr: P: Cl molar ratio of 0.5: 8.0: 1.5: 6: Then, a blue-green light emitting phosphor corresponding to Eu 0.5 Ba 8.4 Sr 1.1 (PO 4 ) 6 Cl 2 was produced in the same manner as in Example 1 described above, and its X-ray diffraction pattern and Luminescent properties were obtained.
- Example 3 As a raw material, Eu 2 O 3 , BaCO 3 , SrCO 3 , BaHPO 4 , SrHPO 4 , BaCl 2 , SrCl 2 were used in a final Eu: Ba: Sr: P: Cl molar ratio of 0.6: 7.7: 1.7: 6: Then, a blue-green light emitting phosphor corresponding to Eu 0.6 Ba 7.7 Sr 1.7 (PO 4 ) 6 Cl 2 was produced in the same manner as in Example 1 above, and its X-ray diffraction pattern and Luminescent properties were obtained.
- Example 4 As raw materials, Eu 2 O 3 , BaCO 3 , SrCO 3 , BaHPO 4 , SrHPO 4 , BaCl 2 , SrCl 2 were used in a final Eu: Ba: Sr: P: Cl molar ratio of 0.6: 8.1: 1.3: 6: Then, a blue-green light emitting phosphor corresponding to Eu 0.6 Ba 8.1 Sr 1.3 (PO 4 ) 6 Cl 2 was produced in the same manner as in Example 1 above, and its X-ray diffraction pattern and Luminescent properties were obtained.
- Example 5 As raw materials, Eu 2 O 3 , BaCO 3 , SrCO 3 , BaHPO 4 , SrHPO 4 , BaCl 2 , SrCl 2 were used in a final Eu: Ba: Sr: P: Cl molar ratio of 0.6: 6.5: 2.9: 6: Then, a blue-green light emitting phosphor corresponding to Eu 0.6 Ba 6.5 Sr 2.9 (PO 4 ) 6 Cl 2 was produced in the same manner as in Example 1 above, and its X-ray diffraction pattern and Luminescent properties were obtained.
- Example 6 As raw materials, Eu 2 O 3 , BaCO 3 , SrCO 3 , BaHPO 4 , SrHPO 4 , BaCl 2 , SrCl 2 were used in a final Eu: Ba: Sr: P: Cl molar ratio of 0.6: 7.4: 2.0: 6: Then, a blue-green light emitting phosphor corresponding to Eu 0.6 Ba 7.4 Sr 2.0 (PO 4 ) 6 Cl 2 was produced in the same manner as in Example 1 above, and its X-ray diffraction pattern and Luminescent properties were obtained.
- compositions of the phosphors obtained in the above Examples 1 to 6 and Comparative Examples 1 to 7 are shown in the following table.
- X-ray diffraction patterns of the phosphors obtained in Examples 1 to 6 and Comparative Examples 1 to 7 are shown in FIGS.
- the emission characteristics of the phosphors obtained in Examples 1 to 6 are shown in FIGS. 5 and 6 (in the figure, J indicates an example and H indicates a comparative example).
- Example 7 Further, in the same manner as described above, Eu 2 O 3 , BaCO 3 , SrCO 3 , BaHPO 4 , SrHPO 4 , BaCl 2 , and SrCl 2 are used as raw materials in the final Eu: Ba: Sr: P: Cl molar ratio. 0.9: 7.1: 2.0: 6: 2 was weighed, and then the blue-green light emitting phosphor corresponding to Eu 0.9 Ba 7.1 Sr 2.0 (PO 4 ) 6 Cl 2 was produced in the same manner as in Example 1 above. As a result, an X-ray diffraction pattern and emission characteristics were obtained.
- Example 8 As a phosphor containing Ca, Eu 2 O 3 , BaCO 3 , SrCO 3 , CaCO 3 , BaHPO 4 , SrHPO 4 , BaCl 2 , and SrCl 2 are used as raw materials as final Eu: Ba: Sr: Ca: P : Cl: The molar ratio was 0.9: 6.6: 1.5: 1.0: 6: 2, and thereafter, as in Example 1 above, Eu 0.9 Ba 6.6 Sr 1.5 Ca 1.0 (PO 4 ) 6 Cl 2 A blue-green light emitting phosphor corresponding to the above was produced, and its X-ray diffraction pattern and emission characteristics were obtained.
- Example 9 As raw materials, Eu 2 O 3 , BaCO 3 , SrCO 3 , BaHPO 4 , SrHPO 4 , BaCl 2 , SrCl 2 were used, and the final Eu: Ba: Sr: P: Cl molar ratio was 1.0: 5.7: 3.3: 6: Then, a blue-green light emitting phosphor corresponding to Eu 1.0 Ba 5.7 Sr 3.3 (PO 4 ) 6 Cl 2 was produced in the same manner as in Example 1 above, and its X-ray diffraction pattern and Luminescent properties were obtained.
- Example 10 As raw materials, Eu 2 O 3 , BaCO 3 , SrCO 3 , BaHPO 4 , SrHPO 4 , BaCl 2 , SrCl 2 were used, and the final Eu: Ba: Sr: P: Cl molar ratio was 1.0: 6.7: 2.3: 6: Then, a blue-green light emitting phosphor corresponding to Eu 1.0 Ba 6.7 Sr 2.3 (PO 4 ) 6 Cl 2 was produced in the same manner as in Example 1 above, and its X-ray diffraction pattern and Luminescent properties were obtained.
- Example 11 As raw materials, Eu 2 O 3 , BaCO 3 , SrCO 3 , BaHPO 4 , SrHPO 4 , BaCl 2 , SrCl 2 were used in a final Eu: Ba: Sr: P: Cl molar ratio of 1.2: 6.3: 2.5: 6: Then, a blue-green light emitting phosphor corresponding to Eu 1.0 Ba 6.7 Sr 2.3 (PO 4 ) 6 Cl 2 was produced in the same manner as in Example 1 above, and its X-ray diffraction pattern and Luminescent properties were obtained.
- Example 12 As a phosphor containing Ca, Eu 2 O 3 , BaCO 3 , SrCO 3 , CaCO 3 , BaHPO 4 , SrHPO 4 , BaCl 2 , and SrCl 2 are used as raw materials as final Eu: Ba: Sr: Ca: P : Cl: The molar ratio is 1.0: 6.7: 2.1: 0.2: 6: 2, and thereafter, Eu 1.0 Ba 6.7 Sr 2.1 Ca 0.2 (PO 4 ) 6 Cl 2 , as in Example 1 above. A blue-green light emitting phosphor corresponding to the above was produced, and its X-ray diffraction pattern and emission characteristics were obtained.
- Example 13 As a phosphor having a composition containing Ca and Mg, Eu 2 O 3 , BaCO 3 , SrCO 3 , CaCO 3 , Mg (OH) 2 , BaHPO 4 , SrHPO 4 , BaCl 2 , and SrCl 2 are used as the final Eu.
- Ba: Sr: Ca: Mg: P: Cl is weighed so that the molar ratio is 1.0: 5.7: 2.8: 0.4: 0.1: 6: 2, and then Eu 1.0 Ba is obtained in the same manner as in Example 1 above.
- a blue-green phosphor corresponding to 5.7 Sr 2.8 Ca 0.4 Mg 0.1 (PO 4 ) 6 Cl 2 was produced, and its X-ray diffraction pattern and emission characteristics were obtained.
- Example 14 As raw materials, Eu 2 O 3 , BaCO 3 , SrCO 3 , BaHPO 4 , SrHPO 4 , BaCl 2 , SrCl 2 were used in a final Eu: Ba: Sr: P: Cl molar ratio of 1.5: 7.2: 1.3: 6: 2 and thereafter, in the same manner as in Example 1 described above, a blue-green light emitting phosphor corresponding to Eu 1.5 Ba 7.2 Sr 1.3 (PO 4 ) 6 Cl 2 was produced, and its X-ray diffraction pattern and Luminescent properties were obtained.
- Example 15 As a phosphor having a composition containing Mg, Eu 2 O 3 , BaCO 3 , SrCO 3 , Mg (OH) 2 , BaHPO 4 , SrHPO 4 , BaCl 2 , SrCl 2 are used as the final Eu: Ba: Sr: Weighed so that the molar ratio of Mg: P: Cl was 0.5: 7.2: 1.8: 0.5: 6: 2, and thereafter, as in Example 1 above, Eu 0.5 Ba 7.2 Sr 1.8 Mg 0.5 (PO 4 ) A blue-green phosphor corresponding to 6 Cl 2 was produced, and its X-ray diffraction pattern and emission characteristics were obtained.
- Example 16 As a phosphor containing Ca, Eu 2 O 3 , BaCO 3 , SrCO 3 , CaCO 3 , BaHPO 4 , SrHPO 4 , BaCl 2 , and SrCl 2 are used as raw materials as final Eu: Ba: Sr: Ca: P : Cl: The molar ratio was 0.6: 6.5: 1.4: 1.5: 6: 2, and thereafter, Eu 0.6 Ba 6.5 Sr 1.4 Ca 1.5 (PO 4 ) 6 Cl 2 , as in Example 1 above. A blue-green light emitting phosphor corresponding to the above was produced, and its X-ray diffraction pattern and emission characteristics were obtained.
- Example 17 As a phosphor containing Ca, Eu 2 O 3 , BaCO 3 , SrCO 3 , CaCO 3 , BaHPO 4 , SrHPO 4 , BaCl 2 , and SrCl 2 are used as raw materials as final Eu: Ba: Sr: Ca: P : Cl: The molar ratio was 0.6: 6.5: 2.4: 0.5: 6: 2, and thereafter, Eu 0.6 Ba 6.5 Sr 2.4 Ca 0.5 (PO 4 ) 6 Cl 2 , as in Example 1 above. A blue-green light emitting phosphor corresponding to the above was produced, and its X-ray diffraction pattern and emission characteristics were obtained.
- compositions of the phosphors obtained in the above Examples 7 to 17 and Comparative Examples 8 to 14 are shown in the following table. Also, the emission characteristics of the phosphors obtained in the above Examples 7 to 17 are shown in FIGS. 7 to 10 (in the figure, J indicates an example and H indicates a comparative example).
- each of the fluorescence obtained in Examples 1 to 6 and Comparative Examples 1 to 7 is used.
- the body was measured for luminance, emission area, retention rate, emission area at 150 ° C., and luminance at 150 ° C. The results obtained are shown in the table below.
- the molar ratio [Ba] that is, the molar ratio (Ba) / molar ratio (Sr + Ca + Mg)) of the barium element in the entire alkaline earth metal element in each phosphor is also shown.
- FIG. 11 shows a graph relating to the emission area and the barium concentration dependency of the phosphors obtained in the above examples.
- the molar ratio [Ba] of the barium element to the entire alkaline earth metal element ie, the molar ratio (Ba) / molar ratio (Sr + Ca + Mg)
- the emission area stably increased as [Ba] increased, and that the emission area rapidly decreased when [Ba] ⁇ 0.95.
- the composition in the range where [Ba] is larger than 0.6 and smaller than 0.95 is small in heat and has excellent heat resistance even in the light emitting area at 150 ° C.
- FIG. 12 shows X-ray diffraction patterns of the phosphors obtained in the above examples and comparative examples for each molar ratio of the barium element in the entire alkaline earth metal element.
- FIG. 13 shows the correlation between the mixing ratio of Eu obtained from the phosphors obtained in the above Examples and Comparative Examples and the light emission area. From the obtained results, the initial characteristics were low when the blending ratio of Eu was lower than 0.3. In addition, when the compounding ratio of Eu is higher than 1.5, the temperature characteristics are inferior. Therefore, in order to obtain more excellent light emission characteristics, the compounding ratio of Eu is preferably 0.3 to 1.5, More preferably, 0.5 to 1.5 was confirmed to be preferable.
- the following table shows the correlation between the mixing ratio of Ca and Mg obtained from the phosphors obtained in Examples 5, 16, 17 and Comparative Examples 3, 11, and 12 and the temperature characteristics. Moreover, the correlation with the compounding ratio of Ca of the blue-green light-emitting fluorescent substance obtained in Examples 5, 16, and 17 and the emission wavelength is shown in FIG. Furthermore, the correlation between the compounding ratio of Ca obtained from the phosphors obtained in Examples 5, 16, 17 and Comparative Examples 3, 11, and 12 and the temperature characteristics (150 ° C. light emission area maintenance ratio) is a half width ( FIG. 15B shows the result together with the result of (FWMH).
- the blue-green light-emitting phosphors obtained in the examples obtained excellent half-width (FWMH) characteristics by containing Ca and Mg. It was confirmed that broadening can be promoted. Conventionally, containing Ca has been a cause of lowering temperature characteristics, but the blue-green light emitting phosphor according to the example of the present invention has temperature characteristics even when Ca is contained. It was confirmed that it exhibits excellent characteristics that it can promote broadening while maintaining.
- FIG. 16 shows the light emission area of the blue-green light-emitting phosphors obtained in Examples 1 to 17.
- the light emission area also has an excellent light emission characteristic that an effective value of about 10% is more advantageous than the numerical value shown in FIG. confirmed.
- FIG. 17 shows the chromaticity range of the blue-green light-emitting phosphors obtained in Examples 1 to 17.
- FIG. 18 shows an emission spectrum diagram of an illuminating device that combines the blue-green light-emitting phosphor obtained in Examples 4 and 17 and another phosphor (in the drawing).
- BG1 Example 4
- BG2 Example 17
- known phosphors may be used.
- red phosphors examples include (Ba, Sr, Ca) 3 SiO 5 : Eu (for example, Sr 3 SiO 5 : Eu (SSE)), (Ba, Sr, Ca) 2 (Si, Al) 5 N 8 : Eu , (Ca, Sr) AlSi (O, N) 3 (eg, (Sr, Ca) AlN 3 : Eu (SCASN)), K 2 (Si, Ge, Ti) F 6 : Mn 4+ (KSF), Li (Eu, RE) W 2 O 8 (RE includes at least one of Sc, Y, La, Gd, and Lu) (LEW) and the like, and as the green phosphor, (Ba, Sr, Ca, Mg) 2 SiO 4 : Eu (BOSE), Si 6-z Al z O z N 8-z (commonly called ⁇ sialon or ⁇ -SiAlON), (Ba, Sr) Si 2 O 2 N 2 , (Ba, Sr, Ca) Mg
- the emission of the blue-green phosphor of this example compensates for the valley of the emission spectrum between blue and green, and simulated sunlight illumination that achieves a spectrum close to sunlight (white light) It was confirmed that a light emitting device) was obtained.
- the wavelength band and the wavelength intensity of the blue-green light emitting phosphor can be controlled by adjusting the blending ratio or the emission color of the blue-green light emitting phosphor according to the above-described embodiment.
- the color temperature of the obtained white light can be freely adjusted. By the adjustment, for example, even the same white light can be selectively obtained from white light close to a bluish fluorescent color to white light close to an orange light bulb color.
- the white light emitting device includes a phosphor resin mixture 1 formed by mixing the above phosphors, a chip 2, a reflector 3, a lead frame 4, a bonding wire 5, and the like. It was configured with.
- this phosphor resin mixture three types of phosphor resin mixtures A, B, and C were produced as follows, and three types of white light emitting devices composed of these phosphor resin mixtures were produced. .
- Phosphor resin mixture A Purple LED + (BCA (J12) + (H1)) + ⁇ -SiAlON + SCASN
- BCA (J12): (H1)): ⁇ -SiAlON: SCASN (50:50): Kneaded into a commercially available silicon resin at 12:20, to obtain a white light emitting device (white LED light emitting device) having the structure shown in FIG. A current was applied to the produced white light emitting device, and the emission spectrum and color rendering were evaluated.
- Phosphor resin mixture B Purple LED + (BCA (J1)) + BOSE + SCASN
- a white light emitting device (white LED light emitting device) having the structure shown in FIG. 19 was obtained by kneading into silicon resin. A current was applied to the produced white light emitting device, and the emission spectrum and color rendering were evaluated.
- Phosphor resin mixture C Purple LED + BCA (J18) + ⁇ -SiAlON + SCASN Further, white using a blue-green light emitting phosphor other than the blue-green light emitting phosphor (BCA) (J1, J12) according to the above embodiment A light emitting device was produced. First, a blue-green light emitting phosphor Eu 0.6 Ba 7.9 Sr 1.45 Mg 0.05 (PO 4 ) 6 Cl 2 (defined as phosphor J18) used in the white light emitting device was synthesized by the same method as in the above examples.
- FIG. 20B shows the result of measuring the emission characteristics by excitation at 400 nm with JASCO FP6500.
- the results of measuring the color rendering properties of the white light emitting device using each of the above phosphor resin mixtures A, B, and C are shown in Table 7 and FIG.
- the color rendering property is a measure of the influence of the light source spectrum on the appearance of the color of the object.
- the color rendering property can be quantitatively evaluated by quantifying the deviation from sunlight (sunlight is a reference value 100). And). That is, the average color rendering index (Ra) and the color rendering index (CRI) are evaluated to be higher in color rendering as it approaches 100. It should be noted that the average color rendering index (Ra) is about 80 in normal indoor lighting.
- the white light emitting device described above the color temperature of the white light changes according to the degree of the blue-green component contained in the blue-green light-emitting phosphor (BCA) that colors blue-green, As shown in the results of the phosphor resin mixtures B and C (color temperature, mixture B: neutral white, mixture C: warm white), a white color having high color rendering properties without using another blue phosphor. It was confirmed that light could be realized. Further, in the white light emitting device, as shown in the result of the phosphor resin mixture A, in addition to the obtained blue-green light emitting phosphors (BCA), a conventional blue phosphor is also mixed and used.
- BCA blue-green light-emitting phosphor
- Ra value 85 the result obtained with respect to the conventional commercially available illuminating device.
- the white light emitting devices using the phosphor resin mixtures A, B, and C described above have extremely high color rendering properties with an average color rendering index (Ra) or color rendering index (CRI) of 95 or more, respectively. It was confirmed to have. Furthermore, from the results shown in FIG. 21, the white light emitting devices using the phosphor resin mixtures A, B, and C are respectively compared with the results of the conventional commercially available lighting device (Ra value 85) of the comparative example. In comparison, the special color rendering index (R1, R2, R3,... R15) of each color is uniformly maintained at a high value, and excellent high color rendering properties can be exhibited for any color. The characteristics were confirmed.
- FIG. 22 shows the results of emission spectra of the white light emitting devices using the phosphor resin mixtures A, B, and C described above. From the obtained results, it was confirmed that the white light emitting device had excellent light emission characteristics because a gentle and uniform spectrum was shown over a wide band.
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Abstract
Description
原料として、Eu2O3、BaCO3、SrCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:P:Clのモル比が0.5:8.0:1.5:6:2になるように秤量し、乳鉢を用いて混合した。この混合物をアルミナ製坩堝に入れ、電気炉に大気中900℃で2時間保持後、粉砕・篩分けをし、さらに5%の水素ガスを含有した窒素雰囲気中、1150℃で5時間保持することにより焼成した。焼成物を水洗浄、乾燥、分級処理後、Eu0.5Ba8.0Sr1.5(PO4)6Cl2に該当する青緑色発光蛍光体を得た。線源がCuKα線のX線回折装置(XRD6100、島津製作所社製)を用いてX線回折パターンを測定した。蛍光分光光度計(FP6500、JASCO社製)で400nm励起による発光特性を測定した。
原料として、Eu2O3、BaCO3、SrCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:P:Clのモル比が0.5:8.0:1.5:6:2になるように秤量し、後は上述の実施例1と同様に、Eu0.5Ba8.4Sr1.1(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
原料として、Eu2O3、BaCO3、SrCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:P:Clのモル比が0.6:7.7:1.7:6:2になるように秤量し、後は上述の実施例1と同様に、Eu0.6Ba7.7Sr1.7(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
原料として、Eu2O3、BaCO3、SrCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:P:Clのモル比が0.6:8.1:1.3:6:2になるように秤量し、後は上述の実施例1と同様に、Eu0.6Ba8.1Sr1.3(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
原料として、Eu2O3、BaCO3、SrCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:P:Clのモル比が0.6:6.5:2.9:6:2になるように秤量し、後は上述の実施例1と同様に、Eu0.6Ba6.5Sr2.9(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
原料として、Eu2O3、BaCO3、SrCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:P:Clのモル比が0.6:7.4:2.0:6:2になるように秤量し、後は上述の実施例1と同様に、Eu0.6Ba7.4Sr2.0(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
Baを含まない組成の蛍光体として、原料として、Eu2O3、SrCO3、SrHPO4、SrCl2を最終的なEu:Sr:P:Clのモル比が0.5:9.5:6:2になるように秤量し、後は上述の実施例1と同様に、Eu0.5Sr9.5(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
原料として、Eu2O3、BaCO3、SrCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:P:Clのモル比が0.5:2.2:7.3:6:2になるように秤量し、後は上述の実施例1と同様に、Eu0.5Ba2.2Sr7.3(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
原料として、Eu2O3、BaCO3、SrCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:P:Clのモル比が0.6:3.5:5.9:6:2になるように秤量し、後は上述の実施例1と同様に、Eu0.6Ba3.5Sr5.9(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
Srを含まない組成の蛍光体として、原料として、Eu2O3、BaCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:P:Clのモル比が0.6:9.4:6:2になるように秤量し、後は上述の実施例1と同様に、Eu0.6Ba9.4(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
原料として、Eu2O3、BaCO3、SrCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:P:Clのモル比が0.5:4.2:5.3:6:2になるように秤量し、後は上述の実施例1と同様に、Eu0.5Ba4.2Sr5.3(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
Ca及びMgを含む組成の蛍光体として、原料として、Eu2O3、BaCO3、SrCO3、CaCO3、Mg(OH)2、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:Ca:Mg:P:Clのモル比が0.3:5.0:3.0:1.5:0.2:6:2になるように秤量し、後は上述の実施例1と同様に、Eu0.3Ba5.0Sr3.0Ca1.5Mg0.2(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
原料として、Eu2O3、BaCO3、SrCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:P:Clのモル比が0.3:9.25:0.45:6:2になるように秤量し、後は上述の実施例1と同様に、Eu0.3Ba9.25Sr0.45(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
さらに、上記と同様にして、原料として、Eu2O3、BaCO3、SrCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:P:Clのモル比が0.9:7.1:2.0:6:2になるように秤量し、後は上述の実施例1と同様に、Eu0.9Ba7.1Sr2.0(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
Caを含む組成の蛍光体として、原料として、Eu2O3、BaCO3、SrCO3、CaCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:Ca:P:Clのモル比が0.9:6.6:1.5:1.0:6:2になるように秤量し、後は上述の実施例1と同様に、Eu0.9Ba6.6Sr1.5Ca1.0(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
原料として、Eu2O3、BaCO3、SrCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:P:Clのモル比が1.0:5.7:3.3:6:2になるように秤量し、後は上述の実施例1と同様に、Eu1.0Ba5.7Sr3.3(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
原料として、Eu2O3、BaCO3、SrCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:P:Clのモル比が1.0:6.7:2.3:6:2になるように秤量し、後は上述の実施例1と同様に、Eu1.0Ba6.7Sr2.3(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
原料として、Eu2O3、BaCO3、SrCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:P:Clのモル比が1.2:6.3:2.5:6:2になるように秤量し、後は上述の実施例1と同様に、Eu1.0Ba6.7Sr2.3(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
Caを含む組成の蛍光体として、原料として、Eu2O3、BaCO3、SrCO3、CaCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:Ca:P:Clのモル比が1.0:6.7:2.1:0.2:6:2になるように秤量し、後は上述の実施例1と同様に、Eu1.0Ba6.7Sr2.1Ca0.2(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
Ca及びMgを含む組成の蛍光体として、原料として、Eu2O3、BaCO3、SrCO3、CaCO3、Mg(OH)2、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:Ca:Mg:P:Clのモル比が1.0:5.7:2.8:0.4:0.1:6:2になるように秤量し、後は上述の実施例1と同様に、Eu1.0Ba5.7Sr2.8Ca0.4Mg0.1(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
原料として、Eu2O3、BaCO3、SrCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:P:Clのモル比が1.5:7.2:1.3:6:2になるように秤量し、後は上述の実施例1と同様に、Eu1.5Ba7.2Sr1.3(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
Mgを含む組成の蛍光体として、原料として、Eu2O3、BaCO3、SrCO3、Mg(OH)2、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:Mg:P:Clのモル比が0.5:7.2:1.8:0.5:6:2になるように秤量し、後は上述の実施例1と同様に、Eu0.5Ba7.2Sr1.8Mg0.5(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
Caを含む組成の蛍光体として、原料として、Eu2O3、BaCO3、SrCO3、CaCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:Ca:P:Clのモル比が0.6:6.5:1.4:1.5:6:2になるように秤量し、後は上述の実施例1と同様に、Eu0.6Ba6.5Sr1.4Ca1.5(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
Caを含む組成の蛍光体として、原料として、Eu2O3、BaCO3、SrCO3、CaCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:Ca:P:Clのモル比が0.6:6.5:2.4:0.5:6:2になるように秤量し、後は上述の実施例1と同様に、Eu0.6Ba6.5Sr2.4Ca0.5(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
原料として、Eu2O3、BaCO3、SrCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:P:Clのモル比が0.9:3.2:5.9:6:2になるように秤量し、後は上述の実施例1と同様に、Eu0.9Ba3.2Sr5.9(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
原料として、Eu2O3、BaCO3、SrCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:P:Clのモル比が1.35:2.95:5.7:6:2になるように秤量し、後は上述の実施例1と同様に、Eu1.35Ba2.95Sr5.7(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
原料として、Eu2O3、BaCO3、SrCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:P:Clのモル比が1.5:2.95:5.55:6:2になるように秤量し、後は上述の実施例1と同様に、Eu1.5Ba2.95Sr5.55(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
Caを含む組成の蛍光体として、原料として、Eu2O3、BaCO3、SrCO3、CaCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:Ca:P:Clのモル比が0.6:3.4:4.5:1.5:6:2になるように秤量し、後は上述の実施例1と同様に、Eu0.6Ba3.4Sr4.5Ca1.5(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
Caを含む組成の蛍光体として、原料として、Eu2O3、BaCO3、SrCO3、CaCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:Ca:P:Clのモル比が0.6:3.4:5.5:0.5:6:2になるように秤量し、後は上述の実施例1と同様に、Eu0.6Ba3.4Sr5.5Ca0.5(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
原料として、Eu2O3、BaCO3、SrCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:P:Clのモル比が0.9:3.7:5.4:6:2になるように秤量し、後は上述の実施例1と同様に、Eu0.9Ba3.7Sr5.4(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
原料として、Eu2O3、BaCO3、SrCO3、BaHPO4、SrHPO4、BaCl2、SrCl2を最終的なEu:Ba:Sr:P:Clのモル比が0.8:5.0:4.2:6:2になるように秤量し、後は上述の実施例1と同様に、Eu0.8Ba5.0Sr4.2(PO4)6Cl2に該当する青緑色発光蛍光体を製造し、そのX線回折パターン及び発光特性を得た。
得られた結果を以下の表に示す。
上記実施例で得られた蛍光体の発光面積とバリウム濃度依存性に関するグラフを図11に示す。得られた結果から、アルカリ土類金属元素の全体に占めるバリウム元素のモル比率 [Ba](すなわち、モル比率(Ba)/モル比率(Sr+Ca+Mg))について、[Ba]>0.6の場合には、[Ba]の増大につれて、安定的に発光面積が増大し、[Ba]≧0.95の場合に発光面積が急低下したことが確認された。また、150℃での発光面積においても、[Ba]が0.6より大きく0.95より小さい範囲の組成が、熱による低下分が少なく、耐熱性に優れることが確認された。
上記実施例及び比較例で得られた蛍光体について、アルカリ土類金属元素の全体に占めるバリウム元素のモル比率ごとのX線回折パターンを図12に示す。得られた結果から、アルカリ土類金属元素の全体に占めるバリウム元素のモル比率[Ba]が60%以下の場合では、X線回折パターンの2θ値が30°近傍において、(211)面、(112)面、及び(300)面に由来する3本の回折ピークを呈する結晶相(SCA相:Srを主体とする結晶構造)が示される一方で、60%より大きい場合では、(112)面及び(300)面に由来する2本の回折ピークを呈する結晶相(BCA相:Baを主体とする結晶構造)が示されたことが確認された。
上記実施例及び比較例で得られた蛍光体から得られたEuの配合比率と発光面積との相関関係を図13に示す。得られた結果から、Euの配合比率が0.3より低い場合には、初期特性が低くなった。また、Euの配合比率が1.5よりも高い場合には、温度特性が劣っていたことから、より優れた発光特性を得るためには、Euの配合比率は、0.3~1.5であることが好ましく、より好ましくは、0.5~1.5 であることが好ましいことが確認された。
上記実施例4、7、14、比較例3、8、及び10で得られた蛍光体から得られたEuの配合比率と温度特性(150℃発光面積維持率)との相関関係を以下の表と共に図14に示す。
上記実施例5、16、17、比較例3、11、及び12で得られた蛍光体から得られたCa及びMgの配合比率と温度特性との相関関係を以下の表に示す。また、実施例5、16、17得られた青緑色発光蛍光体のCaの配合比率と発光波長との相関関係を図15(a)に示す。さらに実施例5、16、17、比較例3、11、及び12で得られた蛍光体から得られたCaの配合比率と温度特性(150℃発光面積維持率)との相関関係を半値幅(FWMH)の結果と合わせて図15(b)に示す。
上記実施例1~17で得られた青緑色発光蛍光体の発光面積を図16に示す。上述した温度特性に関して、比較例よりも高い特性を考慮すれば、発光面積においても、実効値としては、図16で示された数値よりもさらに10%前後は有利であるという優れた発光特性が確認された。
上記実施例1~17で得られた青緑色発光蛍光体の色度範囲を図17に示す。図17(a)で得られた色度範囲について、色度範囲CIE1931表色系で示したものを図17(b)に示す。得られた結果から、太陽光に近いスペクトルを達成するための青緑色発光蛍光体の色度範囲CIE1931表色系において、色度値x=0.10~0.25及び色度値y=0.05~0.40からなる長方形の色度領域が形成されるという優れた発光特性が確認された。すなわち、上記実施例の青緑色発光蛍光体を10~90重量%含有し、BaMgAl10O17:Eu、(Ba,Sr)3MgSi3O8:Eu、Sr10(PO4)6Cl2:Eu、Sr2P2O7:Eu、Ca2PO4Cl:Eu、Ba2PO4Cl:Eu、(Ba,Sr)2SiO4:Eu、及び(Ba,Sr,Ca)Al2O4:Euからなる青色蛍光体及び緑色蛍光体の群より選ばれた一種以上の蛍光体を含んで構成できる。
擬似太陽光照明としての用途を確認するため、上記実施例4及び17で得られた青緑色発光蛍光体と、他の蛍光体を組み合わせた照明装置の発光スペクトル図を図18に示す(図中、BG1:実施例4、BG2:実施例17)。他の蛍光体としては、公知の蛍光体を用いて良い。赤色蛍光体としては、(Ba,Sr,Ca)3SiO5:Eu(例えば、Sr3SiO5:Eu (SSE))、(Ba,Sr,Ca)2(Si,Al)5N8:Eu、(Ca,Sr)AlSi(O,N)3(例えば、(Sr,Ca)AlN3:Eu (SCASN))、K2(Si,Ge,Ti)F6:Mn4+(KSF)、Li(Eu,RE)W2O8(但し、REは、Sc,Y,La,Gd,Luの少なくともいずれかを含む)(LEW)等が挙げられ、緑色蛍光体としては、(Ba,Sr,Ca,Mg)2SiO4:Eu (BOSE)、Si6-zAlzOzN8-z (通称βサイアロンまたはβ-SiAlON)、(Ba,Sr)Si2O2N2、(Ba,Sr,Ca)MgAl10O17:Eu2+,Mn2+ (BAMN)、(Ca,Sr)8Mg(SiO4)4Cl2:Eu等が挙げられ、青色蛍光体としては、BaMgAl10O17:Eu、(Ba,Sr)3MgSi3O8:Eu、Sr10(PO4)6Cl2:Eu、Sr2P2O7:Eu、Ca2PO4Cl:Eu、Ba2PO4Cl:Eu等が挙げられる。
さらに、上記各実施例に係る青緑色発光蛍光体を用いた高演色性の白色光発光装置としての用途を確認した。このような白色光発光装置として、430~500nmの青色乃至青緑色に発光する青緑色発光蛍光体(実施例1、12に係る青緑色発光蛍光体(BCA)(J1,J12)及び比較例1に係る青色発光蛍光体(H1))と、500~580nmの緑色乃至黄色に発光するβサイアロン(又はBOSE)と、580~700nmの赤色乃至深赤色に発光するSCASNと、350~430nmの近紫外光を発するLED素子から構成した。
LEDチップは市販品(400nm)を用いて、(BCA(J12):(H1)):β-SiAlON:SCASN=(50:50):12:20で市販されたシリコン樹脂に練りこみ、上記の図19に示した構成の白色光発光装置(白色LED発光装置)を得た。作製した白色光発光装置に電流印加し、発光スペクトルや演色性の評価を行った。
LEDチップは市販品(400nm)を用いて、BCA(J1):BOSE:SCASN=100:12:18で市販されたシリコン樹脂に練りこみ、上記の図19に示した構成の白色光発光装置(白色LED発光装置)を得た。作製した白色光発光装置に電流印加し、発光スペクトルや演色性の評価を行った。
さらに、上記の実施例に係る青緑色発光蛍光体(BCA)(J1、J12)以外の青緑色発光蛍光体を用いる白色光発光装置を作製した。先ず、上記各実施例と同様の方法で、白色光発光装置に用いる青緑色発光蛍光体Eu0.6Ba7.9Sr1.45Mg0.05(PO4)6Cl2(蛍光体J18と定義する)を合成した。
即ち、原料として、Eu2O3、BaCO3、SrCO3、Mg2(OH)2CO3、(NH4)2HPO4、BaCl2・2H2O、 SrCl2・6H2Oを最終的なEu:Ba:Sr:Mg:P:Clのモル比が0.6:7.9:1.45:0.05:6:2になるように秤量し、乳鉢を用いて混合した。この混合物をアルミナ製坩堝に入れ、電気炉に大気中900℃で2時間保持後、粉砕・篩分けをし、さらに5%の水素ガスを含有した窒素雰囲気中、1150℃で5時間保持することにより焼成した。焼成物を水洗浄、乾燥、分級処理後、青緑色発光蛍光体(蛍光体J18)を得た。線源がCuKα線のX線回折装置(XRD6100、島津製作所社製)を用いてX線回折パターンを測定した結果を図20(a)に示す。また、JASCO製FP6500で400nm励起による発光特性を測定した結果を図20(b)に示す。
2 チップ
3 リフレクタ
4 リードフレーム
5 ボンディングワイヤ
Claims (14)
- Euを賦活剤として、バリウム元素を含む複数のアルカリ土類金属元素と、リン酸と、ハロゲン元素とから構成され、当該アルカリ土類金属元素の全体に占めるバリウム元素のモル比率が、60%より大きく95%より小さい蛍光体であって、
近紫外線を照射し、当該近紫外線の照射により励起されて青緑色の可視光を発光することを特徴とする
青緑色発光蛍光体。 - 請求項1に記載の青緑色発光蛍光体において、
一般式Bab(Sr,Ca,Mg)c(PO4)dXe:Eua(Xはハロゲン元素であり、0<a<1.5、 9.5≦a+b+c≦10.5、5.4≦d≦6.6、1.8≦e≦2.2、0.6<b/(b+c)<0.95)で表されることを特徴とする
青緑色発光蛍光体。 - 請求項1又は2に記載の青緑色発光蛍光体において、
前記ハロゲン元素の50モル%以上が塩素元素であることを特徴とする
青緑色発光蛍光体。 - 請求項1~3のいずれかに記載の青緑色発光蛍光体において、
Sc、Y、La、Gd、Tb、Lu、Pr、Ce、Cr、V、Mn、Znからなる希土類及び遷移金属の群より選ばれた一種以上の共賦活元素を含むことを特徴とする
青緑色発光蛍光体。 - 請求項4に記載の青緑色発光蛍光体を10~90重量%含有し、BaMgAl10O17:Eu、(Ba,Sr)3MgSi3O8:Eu、Sr10(PO4)6Cl2:Eu、Sr2P2O7:Eu、Ca2PO4Cl:Eu、Ba2PO4Cl:Eu、及び(Ba,Sr,Ca)Al2O4:Euからなる青色蛍光体及び緑色蛍光体の群より選ばれた一種以上の蛍光体を含むことを特徴とする
青緑色発光蛍光体。 - 請求項1~5のいずれかに記載の青緑色発光蛍光体を備えることを特徴とする
発光素子。 - 請求項1~5のいずれかに記載の青緑色発光蛍光体を備えることを特徴とする
発光装置。 - 請求項1~5のいずれかに記載の青緑色発光蛍光体と、赤色蛍光体と、緑色蛍光体とを備え、
白色光を発光することを特徴とする
白色光発光装置。 - 請求項1~5のいずれかに記載の青緑色発光蛍光体であって430~500nmの青緑色に発光する青緑色発光蛍光体から成る第一の蛍光体と、
500~580nmの緑色乃至黄色に発光する第二の蛍光体と、
580~700nmの赤色乃至深赤色に発光する第三の蛍光体と、
350~430nmの近紫外光を発するLED素子とを備え、
前記LED素子からの光により前記第一の蛍光体、前記第二の蛍光体、及び、前記第三の蛍光体を直接的又は間接的に励起して発光させて、白色光を発光することを特徴とする
白色光発光装置。 - 請求項9に記載の白色光発光装置において、
平均演色評価数(Ra)又は演色指数(CRI)が95以上であることを特徴とする
白色光発光装置。 - 請求項9又は請求項10に記載の白色光発光装置において、
前記第二の蛍光体が、Eu賦活アルカリ土類ケイ酸塩系蛍光体又はアルカリ土類ケイ酸窒化物系蛍光体を含むことを特徴とする
白色光発光装置。 - 請求項11に記載の白色光発光装置において、
前記第二の蛍光体が、(Ba,Sr,Ca,Mg)2SiO4:Eu (BOSE)、Si6-zAlzOzN8-z(βサイアロン)、(Ba,Sr)Si2O2N2、(Ba,Sr,Ca)MgAl10O17:Eu2+,Mn2+ (BAMN)、(Ca,Sr)8Mg(SiO4)4Cl2:Euの少なくともいずれかを含むことを特徴とする
白色光発光装置。 - 請求項9又は請求項10に記載の白色光発光装置において、
前記第三の蛍光体が、Eu賦活アルカリ土類酸窒化物系蛍光体、Eu賦活アルカリ土類ケイ酸塩系蛍光体、又はMn賦活フッ化物錯体赤色蛍光体の少なくともいずれかを含むことを特徴とする
白色光発光装置。 - 請求項13に記載の白色光発光装置において、
前記第三の蛍光体が、(Ba,Sr,Ca)3SiO5:Eu、(Ba,Sr,Ca)2(Si,Al)5N8:Eu、(Ca,Sr)AlSi(O,N)3、K2(Si,Ge,Ti)F6:Mn4+(KSF)、Li(Eu,RE)W2O8(但し、REは、Sc,Y,La,Gd,Luの少なくともいずれかを含む)(LEW)の少なくともいずれかを含むことを特徴とする
白色光発光装置。
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US11060025B2 (en) | 2017-12-26 | 2021-07-13 | Nichia Corporation | Oxynitride fluorescent material, light emitting device, and method for producing oxynitride fluorescent material |
JP2019116615A (ja) * | 2017-12-26 | 2019-07-18 | 日亜化学工業株式会社 | 酸窒化物蛍光体、発光装置及び酸窒化物蛍光体の製造方法 |
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JP2020084107A (ja) * | 2018-11-29 | 2020-06-04 | 日亜化学工業株式会社 | ハロリン酸塩蛍光体及び発光装置 |
CN116891741A (zh) * | 2023-07-12 | 2023-10-17 | 陕西学前师范学院 | 一种宽带黄绿色荧光粉及其制备方法 |
CN116891741B (zh) * | 2023-07-12 | 2024-04-19 | 陕西学前师范学院 | 一种宽带黄绿色荧光粉及其制备方法 |
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US20180171220A1 (en) | 2018-06-21 |
KR20170137915A (ko) | 2017-12-13 |
EP3321342A1 (en) | 2018-05-16 |
EP3321342A4 (en) | 2019-05-01 |
KR102004392B1 (ko) | 2019-07-26 |
US10160905B2 (en) | 2018-12-25 |
CN107735480A (zh) | 2018-02-23 |
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