OXYNITRIDE PHOSPHOR POWDER
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Abstract
An oxynitride phosphor power has a fluorescence peak wavelength of 580 to 605 nm, the oxynitride phosphor having a higher external quantum efficiency than ever before. The oxynitride phosphor powder is an oxynitride phosphor powder containing αSiAlON and aluminum nitride, represented by composition formula:
Ca_{x1}Eu_{x2}Si_{12−(y+z)}Al_{(y+z)}O_{z}N_{16−z }
wherein x1, x2, y and z are 0<x1≦2.50, 0.01≦x2≦0.20, 0<y≦2.3 and 1.5≦z≦3.5, or x1, x2, y and z are 0<x1≦2.70, 0.05≦x2≦0.20, 2.3≦y≦5.5 and 1≦z≦2.5.
8 Citations
33 Claims

114. 14. (canceled)

15. An oxynitride phosphor powder containing α
 SiAlON and aluminum nitride, represented by composition formula;
Ca_{x1}Eu_{x2}Si_{12−(y+z)}Al_{(y+z)}O_{z}N_{16−z }wherein x1, x2, y and z are 0<
x1≦
2.50, 0.01≦
x2≦
0.20, 0<
y≦
2.3 and 1.5≦
z≦
3.5, or x1, x2, y and z are 0<
x1≦
2.70, 0.05≦
x2≦
0.20, 2.3≦
y≦
5.5 and 1≦
z≦
2.5.  View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 30, 31, 32, 33)
 SiAlON and aluminum nitride, represented by composition formula;

26. A method of producing an oxynitride phosphor powder comprising mixing a silicon source substance, an aluminum source substance, a calcium source substance, and a europium source substance to give a composition represented by composition formula:

Ca_{x1}Eu_{x2}Si_{12−(y+z)}Al_{(y+z)}O_{z}N_{16−z }wherein x1, x2, y and z are 0<
x1≦
2.50, 0.01≦
x2≦
0.20, 0<
y≦
2.3 and or x1, x2, y and z are 0<
x1≦
2.70, 0.05≦
x2≦
0.20, 2.3≦
y≦
5.5 and 1≦
z≦
2.5, and firing the mixture to produce an oxynitride phosphor powder containing α
SiAlON and aluminum nitride.  View Dependent Claims (27, 28, 29)

1 Specification