Patent ID: 7112921

Claim:
A composition of matter useful as a phosphor in light emitting diodes, which comprises a material described by the formula: MS x Se y :B in which: M comprises one or more elements selected from the group consisting of: Be, Mg, Ca, Sr, Ba, Zn, subject to the proviso that Zn is not solely present; B comprises one or more elements selected from the group consisting of: Eu, Ce, Cu, Ag, Al, Tb, Sb, Bi, K, Na, Cl, F, Br, I, Mg, Pr, and Mn; wherein the total amount of B present is 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 ranges selected from the group consisting of: a) a first range between 0.75 and 1; and b) a second range between 1 and 1.25, but further subject to the proviso that x+y≠1.