Patent ID: 7262439

Claim:
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 Ca 1−a−b Ce a Eu b Al 1+a Si 1−a N 3 , where 0<a≦0.2, 0≦b≦0.2; Ca 1−c−d Ce c Eu d Al 1−c (Mg,Zn) c SiN 3 , where 0<c≦0.2, 0≦d≦0.2; Ca 1−2e−f Ce e (Li,Na) e Eu f AlSiN 3 , where 0<e≦0.2, 0≦f≦0.2, e+f>0; or Ca 1−g−h−i Ce g (Li,Na) h Eu j Al 1+g−h Si 1−g+h N 3 where 0≦g≦0.2, 0<h≦0.4, 0≦i≦0.2, g+i>0.