Abstract
Deviations from the exponential behaviour of the slow luminescence decay and the intensity ratio of the fast and the slow components, respectively, are inverstigated for the main ultraviolet Pb 2+ emission in KCl:Pb 2+, KBr:Pb 2+ and KI:Pb 2+ in the 4.2–200 K temperature range. An explanation of the non-exponential decays is proposed as a consequence of slow local lattice relaxation in the excited state, New values of the slow component lifetimes are identified and the correction of other parameters of a three-level model is discussed.
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