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Phosphor, method for producing the same and light-emitting device using the same

  • US 8,608,980 B2
  • Filed: 02/12/2013
  • Issued: 12/17/2013
  • Est. Priority Date: 09/03/2007
  • Status: Active Grant
First Claim
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1. A method for producing a phosphor, the method comprising:

  • a kneading step in which a raw material is kneaded to provide a raw material mixture;

    a sintering step in which the raw material mixture is sintered; and

    a heat treatment step in which the sintered raw material mixture is heat-treated,wherein the raw material comprises at least one or more M-containing materials selected from MSi2, MSiN2, M2Si5N8, M3Al2N4 and MSi6N8, wherein M is one or more divalent elements selected from M(0) and M(1), andwherein the phosphor is represented by a general formula;

    M(0)a M(1)b M(2)x−

    vm+n)
    M(3)(vm+n)−

    y
    OnNz−

    n
    , whereinM(0) is one or more elements selected from Li, Na, Be, Mg, Ca, Sr, Ba, Sc, Y, La, Gd and Lu;

    M(1) is one or more activators selected from Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm and Yb;

    M(2) is one or snore elements selected from Si, Ge, Sn, Ti Hf and Zr;

    M(3) is one or more elements selected from Be, B, Al, Ga, In, Tl and Zn;

    O is oxygen;

    N is nitrogen; and

    an atomic ratio of M(0), M(1), M(2), M(3), O and N is adjusted to satisfy the following;

    x, y and z satisfy 33≦

    x≦

    51, 8≦

    y≦

    12 and 36≦

    z≦

    56;

    a and b satisfy 3≦

    a+b≦

    7 and 0.001≦

    b≦

    1.2;

    m and n satisfy 0.8·

    me≦

    m≦

    1.2·

    me and 0≦

    n≦

    7 in which me=a+b; and

    v satisfies v={a·

    v(0)+b·

    v(1)}/(a+b), wherein v(0) is a valence of M(0) ion and v(1) is a valence of M(1) ion.

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