| abstract |
The red-emitting phosphor may include a nitride-based composition represented by the chemical formula MaSrbSicAldNeEuf, wherein M is at least one of Mg, Ca, Sr, Ba, Y, Li, Na, K, and Zn, 0 < a < 1.0; 1.5<b<2.5; 4.0≦c≦5.0; 0≦d≦1.0; 7.5<e<8.5; and 0<f<0.1; a+b+f>2+d/v; and v is M Valence price. Further, the nitride-based red-emitting phosphor composition may be represented by the chemical formula MxM'2Si5-yAlyN8:A, wherein M is at least at least Mg, Ca, Sr, Ba, Y, Li, Na, K, and Zn. And 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; >y/v and v is the valence of M; and wherein the red-emitting phosphors have a general crystalline structure of M'2Si5N8:A. |