Patent ID: 8465166

Claim:
An illumination system, comprising at least one luminescent material, the luminescent material comprising: a (AEN 2/3 )* b (MN)* c (SiN 4/3 )* d 1 CeO 3/2 *d 2 EuO* x SiO 2 *y AlO 3/2 wherein AE is an alkaline earth metal selected from the group consisting of Ca, Mg, Sr and Ba or mixtures thereof and M is a trivalent element selected from the group consisting of Al, B, Ga, Sc or mixtures thereof with 0.95≦2*(a+d1+d2)/(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 .