Charge compensated nitride phosphors for use in lighting applications
AssigneeLumination LLC
InventorsAnant Achyut Setlur, Emil Vergilov Radkov
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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.
Claims19
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.
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.
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.
Dependencies are inferred from the claim text.