Thermoluminescence, glow curves, and carrier traps in colored and nominally pure LiF crystals
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- Baldacchini, G., Chiacchiaretta, P., Gupta, V. et al. Phys. Solid State (2008) 50: 1747. doi:10.1134/S106378340809031X
Thermoluminescence (TL) of nominally pure LiF crystals irradiated with gamma rays has been studied in connection with color centers (CCs) generated during ionizing irradiation. A close analysis of the experimental TL spectra unveiled the existence of 10 glow peaks (GPs) spanning from 100 to 450°C. The relatively well-resolved GPs up to 263°C are associated with F3+, F3, and F2 CCs, while the remaining tangled ones are attributed to F and F-like CCs. A first-order kinetics approach is used to simulate the TL spectra, and the appropriate parameters of the carrier traps are obtained. A critical analysis of their values showed, on the one side, the usefulness of using pure crystals to understand their basic contributions to TL, and, on the other side, the possible existence of further weak GPs and the role still played by the residual amount of impurities.