Light-emitting device
First Claim
1. A light-emitting device comprising:
- a light-emitting element emitting primary light; and
a wavelength conversion portion including a plurality of green or yellow light-emitting phosphors and a plurality of red light-emitting phosphors, and absorbing a part of said primary light and emitting secondary light having a wavelength equal to or longer than wavelength of the primary light;
wherein said green or yellow light-emitting phosphor is implemented by at least one selected from a europium (II)-activated silicate phosphor substantially expressed as General Formula (A-1);
2(MI1-aEua)O.SiO2 (in General Formula (A-1), MI represents at least one element selected from among Mg, Ca, Sr, and Ba, and relation of 0.005≦
a≦
0.10 is satisfied) and a cerium (III)-activated silicate phosphor substantially expressed as General Formula (A-2);
MII3(MIII1-bCeb)2(SiO4)3 (in General Formula (A-2), MII represents at least one element selected from among Mg, Ca, Sr, and Ba, MIII represents at least one element selected from among Al, Ga, In, Sc, Y, La, Gd, and Lu, and relation of 0.005≦
b≦
0.5 is satisfied), and said red light-emitting phosphor is implemented by a europium (II)-activated nitride phosphor substantially expressed as General Formula (B);
(MIV1-cEuc)MVSiN3 (in General Formula (B), MIV represents at least one element selected from among Mg, Ca, Sr, and Ba, MV represents at least one element selected from among Al, Ga, In, Sc, Y, La, Gd, and Lu, and relation of 0.001≦
c≦
0.05 is satisfied).
1 Assignment
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Accused Products
Abstract
A light-emitting device includes a light-emitting element emitting primary light and a wavelength conversion portion absorbing a part of the primary light and emitting secondary light having a wavelength equal to or longer than the wavelength of the primary light. The wavelength conversion portion includes a plurality of green or yellow light-emitting phosphors and a plurality of red light-emitting phosphors. The green or yellow light-emitting phosphor is implemented by at least one selected from a specific europium (II)-activated silicate phosphor (A-1) and a specific cerium (III)-activated silicate phosphor (A-2). The red light-emitting phosphor is implemented by a specific europium (II)-activated nitride phosphor (B). The light-emitting device emitting white light at efficiency and color rendering property higher than in a conventional example can thus be provided.
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Citations
22 Claims
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1. A light-emitting device comprising:
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a light-emitting element emitting primary light; and
a wavelength conversion portion including a plurality of green or yellow light-emitting phosphors and a plurality of red light-emitting phosphors, and absorbing a part of said primary light and emitting secondary light having a wavelength equal to or longer than wavelength of the primary light;
whereinsaid green or yellow light-emitting phosphor is implemented by at least one selected from a europium (II)-activated silicate phosphor substantially expressed as General Formula (A-1);
2(MI1-aEua)O.SiO2 (in General Formula (A-1), MI represents at least one element selected from among Mg, Ca, Sr, and Ba, and relation of 0.005≦
a≦
0.10 is satisfied) and a cerium (III)-activated silicate phosphor substantially expressed as General Formula (A-2);
MII3(MIII1-bCeb)2(SiO4)3 (in General Formula (A-2), MII represents at least one element selected from among Mg, Ca, Sr, and Ba, MIII represents at least one element selected from among Al, Ga, In, Sc, Y, La, Gd, and Lu, and relation of 0.005≦
b≦
0.5 is satisfied), andsaid red light-emitting phosphor is implemented by a europium (II)-activated nitride phosphor substantially expressed as General Formula (B);
(MIV1-cEuc)MVSiN3 (in General Formula (B), MIV represents at least one element selected from among Mg, Ca, Sr, and Ba, MV represents at least one element selected from among Al, Ga, In, Sc, Y, La, Gd, and Lu, and relation of 0.001≦
c≦
0.05 is satisfied). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A light-emitting device comprising:
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a light-emitting element emitting primary light; and
a wavelength conversion portion including a plurality of green or yellow light-emitting phosphors, a plurality of red light-emitting phosphors and a plurality of blue light-emitting phosphors, and absorbing a part of said primary light and emitting secondary light having a wavelength equal to or longer than wavelength of the primary light;
whereinsaid green or yellow light-emitting phosphor is implemented by at least one selected from a europium (II)-activated silicate phosphor substantially expressed as General Formula (A-1);
2(MI1-aEua)O.SiO2 (in General Formula (A-1), MI represents at least one element selected from among Mg, Ca, Sr, and Ba, and relation of 0.005≦
a≦
0.10 is satisfied) and a cerium (III)-activated silicate phosphor substantially expressed as General Formula (A-2);
MII3(MIII1-bCeb)2(SiO4)3 (in General Formula (A-2), MII represents at least one element selected from among Mg, Ca, Sr, and Ba, MIII represents at least one element selected from among Al, Ga, In, Sc, Y, La, Gd, and Lu, and relation of 0.005≦
b≦
0.5 is satisfied),said red light-emitting phosphor is implemented by a europium (II)-activated nitride phosphor substantially expressed as General Formula (B);
(MIV1-cEuc)MVSiN3 (in General Formula (B), MIV represents at least one element selected from among Mg, Ca, Sr, and Ba, MV represents at least one element selected from among Al, Ga, In, Sc, Y, La, Gd, and Lu, and relation of 0.001≦
c≦
0.05 is satisfied), andsaid blue light-emitting phosphor is implemented by at least one selected from a europium (II)-activated halophosphate phosphor substantially expressed as General Formula (C-1);
(MVI,Eu)10(PO4)6.Cl2 (in General Formula (C-1), MVI represents at least one element selected from among Mg, Ca, Sr, and Ba), a europium (II)-activated aluminate phosphor substantially expressed as General Formula (C-2);
d(MVII,Eu)O.eAl2O3 (in General Formula (C-2), MVII represents at least one element selected from among Mg, Ca, Sr, Ba, and Zn, and relation of d>
0, e>
0 and 0.1≦
d/e≦
1.0 is satisfied), and a europium (II)- and manganese-activated aluminate phosphor substantially expressed as General Formula (C-3);
f(MVII,Euh,Mni)O.gAl2O3 (in General Formula (C-3), MVII represents at least one element selected from among Mg, Ca, Sr, Ba, and Zn, and relation of f>
0, g>
0, 0.1≦
f/g≦
1.0, and 0.001≦
i/h≦
0.2 is satisfied). - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification