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Light-emitting device

  • US 20070052342A1
  • Filed: 08/31/2006
  • Published: 03/08/2007
  • Est. Priority Date: 09/01/2005
  • Status: Abandoned Application
First Claim
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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).

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