| abstract |
The red-emitting phosphor may comprise a nitride-based composition represented by the formula M a Sr b Si c Al d N e Eu f wherein M is at least one element selected from the group consisting of Mg, Ca, Sr, Ba, Y, Li, Zn, 0 < a <1.0; 1.5 < b <2.5; 4.0? C? 5.0; 0? D? 1.0; 7.5 < e <8.5; 0 < f <0.1; a + b + f > 2 + d / v; v is the valence of M. In addition, the nitride-based red-emitting phosphor composition can be represented by the formula M x M ' 2 Si 5 -y Al y N 8 : A, where M is Mg, Ca, Sr, Ba, Y, Li, And Zn, x >0; M 'is at least one of Mg, Ca, Sr, Ba and Zn; 0? Y? 0.15; A is at least one of Eu, Ce, Tb, Pr and Mn; x> y / v, v is the valence of M; The red-emitting phosphor has a general crystal structure of M ' 2 Si 5 N 8 : A. |