| abstract |
Red-emitting phosphors may comprise a nitride-based composition represented by the chemical formula M a Sr b Si c Al c N e Eu f , wherein: M is at least one of Mg, Sr, Ba, Y, Li, Na, K and Zn, and 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; wherein a+b+f >2+d/v and v is the valence of M, and wherein said red-emitting phosphor has the general crystalline structure of Sr 2 Si 5 N 8 : Eu with M and Al incorporated therein. |