Abstract: The structure of (Cd_xZn_1-xS:Ag obtained by sintering at 8500 was determined by X-ray diffraction method,The solid solution is of homogeneous wurtzite over the range of 0,5x from 0.3 to 0,the fraction of Zn-rich sphalerite increases gradually till all the structure becomes of sphalerite, The lattice parameters vary with the composition of the solution and it results in a variation of luminescence emission spectra, The phase transition from the sphalerite to wurtzite occurs at about 700℃ with simultaneous formation of the luminescence center.

Key words: Cadium sulfide, Zinc sulfide, Phosphors