Photoluminescence spectra of Ge(S x Se 1 [ m i n u s ] x ) 2 glasses are investigated with respect to their composition and excitation-energy dependence. Even if the S content, x, is increased to 0.99, the photoluminescence spectra mainly involve those of g-GeSe 2 glasses as their ingredient. This result indicates that the luminescence mainly occurs in Se-related luminescent centers. The excitation-energy dependence of the photoluminescence intensity of Se-rich and S-rich samples shows a similar tendency to those of GeSe 2 and GeS 2 glasses, respectively. We conclude that the energy transfer from S sites excited by light to Se sites is responsible for the observed phenomena.