Patent ID: 7011896

Claim:
A phosphor thin film comprising a matrix material and a luminescence center, said matrix material having the compositional formula: M II v A x B y O z S w wherein M II is at least one element selected from the group consisting of Zn, Cd and Hg, A is at least one element selected from the group consisting of Mg, Ca, Sr, Ba and rare earth elements, B is at least one element selected from the group consisting of Al, Ga and In, and v, x, y, z and w are representative of atomic ratios, v is from 0.005 to 5, x is from 1 to 5, y is from 1 to 15, z is more than 0 and not more than 30, and w is more than 0 and not more than 30, wherein in the compositional formula, v and x are such numbers that v/x is from 0.001 to 1.