Patent ID: 7109648

Claim:
A composition of matter useful as a phosphor in light emitting diodes, which comprises a material described by the formula: MA 2 (S x Se y ) 4 :B in which: M comprises one or more elements selected from the group consisting of: Be, Mg, Ca, Sr, Ba, Zn; A comprises one or more elements selected from the group consisting of: Al, Ga, In, Y, La, and Gd; B comprises one or more elements selected from the group consisting of: Eu, Ce, Cu, Ag, Al, Tb, Cl, Br, F, I, Mg, Pr, K, Na, and Mn, wherein B is present in any amount between 0.0001% and about 10% in mole percent based on the total molar weight of said composition, and wherein x and y are each independently any value between 0 and 1, subject to the proviso that the sum of x and y is equal to any number in the range of between about 0.75 and about 1.25.