Abstract
CdF2 crystals have the fluorite structure and a gap 7.6eV wide. Under X rays excitation pure crystals show, at temperatures lower than 100 K, an intense blue luminescence. The emission spectrum evidences a large band between 300 and 500 nm with a maximum at about 380 nm(1).In doped samples one observes the same luminescence besides that of the intentional impurity. The same blue emission is obtained also in the electroluminescence of pure and doped CdF2 crystals(2).