Garnet phosphor materials having enhanced spectral characteristics
First Claim
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1. A lighting apparatus for emitting white light comprising:
- a light source emitting radiation at from about 250 nm to about 550 nm; and
a phosphor composition radiationally coupled to the light source, the phosphor composition comprising (Y1-x-y-zTbxGdyCez)3(M1M2)t(Al1-r-sGarIns)A-2tO12+D, where M1 is Mg or Zn, M2 is Si or Ge, 0<
x+y<
1, 0.01<
z<
0.1, 0.1<
t<
1.5, 0<
r, s<
0.5, 4.5<
A<
5.0, and −
1<
D<
1.
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Abstract
Phosphor compositions having the formula (Y1-x-y-zTbxGdyCez)3(M1M2)t(Al1-r-sGarIns)A-2tO12+D, where M1 is Mg or Zn, M2 is Si or Ge, 0<x+y<1, 0.01<z<0.1, 0.1<t<1.5, 0<r, s<0.5, 4.5<A<5.0, and −1<D<1. Also disclosed are light emitting devices including a light source and at least one phosphor having the above formula. Such phosphors exhibit a deeper red emission when compared to conventional TAG phosphors, allowing the production of white light sources having improved properties.
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Citations
21 Claims
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1. A lighting apparatus for emitting white light comprising:
-
a light source emitting radiation at from about 250 nm to about 550 nm; and a phosphor composition radiationally coupled to the light source, the phosphor composition comprising (Y1-x-y-zTbxGdyCez)3(M1M2)t(Al1-r-sGarIns)A-2tO12+D, where M1 is Mg or Zn, M2 is Si or Ge, 0<
x+y<
1, 0.01<
z<
0.1, 0.1<
t<
1.5, 0<
r, s<
0.5, 4.5<
A<
5.0, and −
1<
D<
1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A phosphor composition comprising (Y1-x-y-zTbxGdyCez)3(M1M2)t(Al1-r-sGarIns)A-2tO12+D, where M1 is Mg or Zn, M2 is Si or Ge, 0<
- x+y<
1, 0.01<
z<
0.1, 0.1<
t<
1.5, 0<
r, s<
0.5, 4.5<
A<
5.0, and −
1<
D<
1. - View Dependent Claims (16, 17, 19, 20, 21)
- x+y<
-
18. A phosphor blend including a first phosphor having the formula (Y1-x-y-zTbxGdyCez)3(M1M2)t(Al1-r-sGarIns)A-2tO12+D, where M1 is Mg or Zn, M2 is Si or Ge, 0<
- x+y<
1, 0.01<
z<
0.1, 0.1<
t<
1.5, 0<
r, s<
0.5, 4.5<
A<
5.0, and −
1<
D<
1, and a TAG;
Ce phosphor.
- x+y<
Specification