Patent ID: 6939482

Claim:
A phosphor thin film on a support comprising: a matrix material expressed by a composition formula A x B y O w S z , A representing at least one element selected from the group consisting of Mg; Ca, Sr, Ba, and Zn, B representing at least one element selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, molar ratios being respectively set as 0<x<5, 0<y<4, 0≦z<8, and 0≧w<8, and 0=z=w never holding true, and a substance functioning as a luminescence center in the matrix material, wherein the matrix material satisfies 0.001<w/(z+w)<0.6.