Abstract
The stable formation of several colour centres (CCs) has been investigated in lithium fluoride (LiF) single crystals irradiated at room temperature (RT) and at 213 K by 5 MeV electrons with doses from 10 19 to 10 23 eV/cm 3. The temperature during irradiation influences the production of aggregate defects, in particular the ratio between the F 3 + and F 2 laser active centres and the amount of parasitic complex defects. Optical absorption and photoluminescence spectra allow clarifying the role of different aggregate defects on the emission properties of the F 3 + and F 2 centres at concentrations up to 10 18 cm −3.
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