In the present paper optical absorption characterizations of RbBr0.95 Cl0.05 mixed crystals doped with Tl+ (0.02mol %) were grown under vacuum by slow cooling from its melt. The changes in the absorption spectra of mixed crystals are due to some complex Tl+ centers. Photostimulated Luminescence observed in gamma rays irradiated crystals resembled their respective PL emissions indicating that PSL in them is due to Tl+ ions.