Charge compensated nitride phosphors for use in lighting applications
First Claim
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1. A lighting apparatus for emitting white light comprising:
- a light source emitting radiation with a peak at from about 250 nm to about 550 nm; and
a phosphor material radiationally coupled to the light source, the phosphor material comprising at least one of Ca1−
a−
bCeaEubAl1+aSi1−
aN3, where 0<
a≦
0.2, 0≦
b≦
0.2;
Ca1−
c−
dCecEudAl1−
c(Mg,Zn)cSiN3, where 0<
c≦
0.2, 0≦
d≦
0.2;
Ca1−
2e−
fCee(Li,Na)eEufAlSiN3, where 0<
e≦
0.2, 0≦
f≦
0.2, e+f>
0;
or Ca1−
g−
h−
iCeg(Li,Na)hEujAl1+g−
hSi1−
g+hN3 where 0≦
g≦
0.2, 0<
h≦
0.4, 0≦
i≦
0.2, g+i>
0.
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Abstract
Disclosed are phosphor compositions having the formulas Ca1−a−bCeaEubAl1+aSi1−aN3, where 0<a≦0.2, 0≦b≦0.2; Ca1−c−dCecEudAl1−c(Mg,Zn)cSiN3, where 0<c≦0.2, 0≦d≦0.2; Ca1−2e−fCee(Li,Na)eEufAlSiN3, where 0≦e≦0.2, 0≦f≦0.2, g+h>0; and Ca1−g−h−iCeg(Li,Na)hEuiAl1+g−hSi1−g+hN3 where 0≦g≦0.2, 0<h≦0.4, 0≦i≦0.2,g+i>0. When combined with radiation from a blue or UV light source, these phosphors can provide light sources with good color quality having high CRI over a large color temperature range. Also disclosed are blends of the above phosphors and additional phosphors.
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Citations
19 Claims
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1. A lighting apparatus for emitting white light comprising:
a light source emitting radiation with a peak at from about 250 nm to about 550 nm; and
a phosphor material radiationally coupled to the light source, the phosphor material comprising at least one of Ca1−
a−
bCeaEubAl1+aSi1−
aN3, where 0<
a≦
0.2, 0≦
b≦
0.2;
Ca1−
c−
dCecEudAl1−
c(Mg,Zn)cSiN3, where 0<
c≦
0.2, 0≦
d≦
0.2;
Ca1−
2e−
fCee(Li,Na)eEufAlSiN3, where 0<
e≦
0.2, 0≦
f≦
0.2, e+f>
0;
or Ca1−
g−
h−
iCeg(Li,Na)hEujAl1+g−
hSi1−
g+hN3 where 0≦
g≦
0.2, 0<
h≦
0.4, 0≦
i≦
0.2, g+i>
0.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
13. A phosphor material comprising at least one of Ca1−
- a−
bCeaEubAl1+aSi1−
aN3, where 0<
a≦
0.2, 0≦
b≦
0.2;
Ca1−
c−
dCecEudAl1−
c(Mg,Zn)cSiN3, where 0<
c≦
0.2, 0≦
d0.2;
Ca1−
2e−
fCee(Li,Na)eEufAlSiN3, where 0<
e≦
0.2, 0≦
f≦
0.2,e+f>
0;
or Ca1−
g−
h−
iCeg(Li,Na)hEuiAl1+g−
hSi1−
g+hN3, where 0≦
g≦
0.2, 0<
h≦
0.4, 0≦
i≦
0.2, g+i>
0. - View Dependent Claims (14)
- a−
-
15. A phosphor blend including at least one of Ca1−
- a−
bCeaEubAl1+aSi1−
aN3, where 0<
a≦
0.2, 0≦
b≦
0.2;
Ca1−
c−
dCecEudAl1−
c(Mg,Zn)cSiN3, where 0<
c≦
0.2, 0≦
d≦
0.2;
Ca1−
2e−
fCee(Li,Na)eEufAlSiN3, where 0<
e≦
0.2, 0≦
f≦
0.2, e+f<
0;
or Ca1−
g−
h−
iCeg(Li,Na)hEuiAl1+g−
hSi1−
g+hN3, where 0≦
g≦
0.2, 0<
h≦
0.4, 0≦
i≦
0.2, g+i>
0; and
at least one additional phosphor, wherein the phosphor blend is capable of emitting light suitable for use in general illumination either alone or in combination with radiation emitted by a light source radiationally coupled to the phosphor. - View Dependent Claims (16, 17, 18, 19)
- a−
Specification