Charge compensated nitride phosphors for use in lighting...

Details Charge compensated nitride phosphors for use in lighting... Charge compensated nitride phosphors for use in lighting...

2007-08-28

2007-08-28

Tran, Minh-Loan (Department: 2826)

Active solid-state devices (e.g., transistors, solid-state diode

Incoherent light emitter structure

With reflector, opaque mask, or optical element integral...

C257SE33061, C252S30140R, C428S690000

Reexamination Certificate

active

11285024

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+hN3where 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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K. Uheda, et al., “Luminescence Properties of a Red Phosphor, CaAISiN3:Eu2+, for White Light-Emitting Diodes”, Electrochemical and Solid-State Letters, vol. 9 (40 H22-H25 (2006).

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