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Metal silicate halide phosphors and LED lighting devices using the same

  • US 8,906,262 B2
  • Filed: 09/27/2006
  • Issued: 12/09/2014
  • Est. Priority Date: 12/02/2005
  • Status: Expired due to Fees
First Claim
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1. A lighting device comprising:

  • a) a light source that emits light at wavelengths of at least about 300 nm; and

    b) at least one phosphor having a formula selected from the group consisting of;

    1) (M1xM21-x)2LiSiO4X;

    A;

    2) (M1xM21-x)10(SiO4)3(SO4)3X2;

    A; and

    3) (M1xM21-x)4(SiO4)(SO4)X2;

    A;

    wherein;

    M1 and M2 are each independently at least one metal ion selected from the group consisting of Mg2+, Ca2+, Sr+, Ba2+, Zn2+and Cd2+;

    X is a value from about 0.001 to about 1;

    X is at least one halide ion in ionic form;

    A is at least one activator ion selected from the group consisting of Eu2+, Yb2+, Mn2+, Bi3+, Pb2+, Ce3+, Nd3+, Pr2+, Sm3+, Eu3+, Gd3+, Tb3+, Dy3+, Ho3+, Er3+, Tm3+ and Yb3+;

    if the phosphor has the formula (M1xM21-x)2LiSiO4X;

    A, and M1 is Sr2+, x is 1 and X is fluoride or M2 is Sr2+, x is 0 and X is fluoride, then A is not Eu2+; and

    the phosphor is capable of absorbing at least a portion of the light emitted from the light source;

    the phosphor modifies a chromaticity of the portion of the light absorbed from the light source; and

    the phosphor emits light of a longer wavelength than that of the light absorbed from the light source.

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