Absorption, photo- and radio-luminescence spectra were investigated in as-grown and irradiated Eu-doped crystals. It was found that the Eu2+ ions overlapped markedly. Irradiation provoked an Eu3+ → Eu2+ transition, and F-center formation. Color center destruction during annealing was accompanied by thermostimulated luminescence (peaks at 340, 420 and 490K) with that typical for Eu2+ ion emission (370nm).

Optical and Scintillation Properties of LiCaAlF6:Eu Crystal. N.V.Shiran, A.V.Gektin, S.V.Neicheva, V.A.Kornienko, K.Shimamura, N.Ishinose: Journal of Luminescence, 2003, 102-103, 815-8