An intense emission band peaked at about 370 nm has been observed in nominally pure and Eu3+and Gd3+doped CdF2single crystals, and has been studied with the aid of absorption, excitation and thermoluminescence measurements. The reported experimental results, and mainly the independence of the spectral position and of the shape of the band on the growing and doping conditions of the samples, and the lack of any excitation in the gap strongly suggest to interpret the emission as due to an electron-self trapped hole recombination, with an activation energy of ≈0.075 eV. © 1976.
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