Patent ID: 8653549

Claim:
A luminescent material for use with a light emitting device, comprising: aMO-bAlN-cSi 3 N 4 , where M is one element selected from alkaline earth metals, and 0.2≦a/(a+b)≦0.9, 0.05≦b/(b+c)≦0.85, and 0.4≦c/(c+a)≦0.9, wherein at least one peak intensity of light in a wavelength of between about 480 nm to about 680 nm is provided by the luminescent material when excited by light from the light emitting device, wherein the luminescent material is one of Sr 2 Al 3 Si 2 O 2 N 17/3 :Eu, or Sr 2 Al 2 Si 2 O 2 N 14/3 :Eu.