Patent ID: 7922937

Claim:
A phosphor composition having at least two silicate-based phases, the composition comprising: a first phase with a crystal structure substantially the same as that of (M1) 2 SiO 4 ; and a second phase with a crystal structure substantially the same as that of (M2) 3 SiO 5 ; wherein: M1 and M2 are each selected from the group consisting of Sr, Ba, Mg, Ca, and Zn; at least one phase of the composition contains greater than or equal to about 0.0001 percent by weight Mg; at least one phase of the composition is activated with divalent europium (Eu 2+ ); and at least one of the phases of the composition contains a dopant D selected from the group consisting of F, Cl, Br, S, and N, wherein at least some of the dopant atoms are located on oxygen atom lattice sites of the host silicate crystal.