Complex centers in γ-irradiated LiF: Cu 2+ crystals

Abstract

Optical spectra of γ-irradiated LiF: Cu 2+ crystals are measured as a function of impurity concentration and coloration intensity. New defects are revealed by means of their luminescences and tentatively identified as aggregate color centers associated with the dopant ions. F 2 centers coupled to Cu 2+ ions show absorption at 375 nm and emission at 500 nm, while F 3 + centers coupled to Cu 2+ ions exhibit absorption at 470 nm and luminescence at 570 nm.