Patent ID: 8796916

Claim:
A device comprising: a light source configured to emit light having a wavelength between 400 nm and 480 nm; and a luminescent material positioned to absorb light emitted by the light source, the luminescent material comprising (AEN 2/3 )*b(MN)*c(SiN 4/3 )*d 1 CeO 3/2 *d 2 EuO*xSiO 2 *yAlO 3/2 wherein AE is an alkaline earth metal chosen of the group of Ca, Mg, Sr and Ba or mixtures thereof and M is a trivalent element chosen of the group of Al, B, Ga, Sc or mixtures thereof, wherein 0.95≦2*( a+d 1 +d 2 )/( b+c+x+y )≦1.2 a+d 1 +d 2 ≧c+x, ( b+y ):( c+x )≧1, ( b+y )≦1+10* d 1 , b≧ 5* y, c≧ 10* x, 0.0001 ≦d 1 ≦0.2 and d 1 ≧10* d 2 .