Abstract
The optical properties of nominally pure CaF2 crystals as well as those of pure and Li+ and Na+-doped CaF2 powders are compared. The emission band peaking at 3.85 eV and the excitation band in the region of 10–10.6 eV, observed in CaF2: Li and CaF2: Na powders, are ascribed to the radiative decay of a self-trapped exciton perturbed by an anion vacancy.
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