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The temperature dependence of luminescence and of the decay times of the 430 nm emission band is studied in the NaCl:Pb++ system heavily doped and annealed for long time at 200°C. This emission band – that is excited at 262 or 267 nm – is found to behave very similarly to a corresponding emission band present in the PbCl2 system, this fact supporting the hypothesis that the 430 nm emission is connected with a PbCl2 phase growing in the NaCl matrix. The temperature dependent lifetime is explained in terms of radiationless processes thermally activated with an activation energy of 0.13 eV.
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Capelletti et al. (1983) studied this question.
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