Analytical and experimental check of a model for correlated thermoluminescence and thermally stimulated conductivity

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Abstract
We consider the simple trapped-carrier-free-carrier recombination model often used to describe thermoluminescence (TL) and thermally activated current (TAC) experiments. Both TL and TAC and thermogram shapes depend sensitively on parameter values in the model and general solutions for them have not been derived. We show, however, that one can derive a correlation expression for TL and TAC signals. This correlation expression is exact and can be studied experimentally to check the validity of the model. Experiments in LiF demonstrate, for two pairs of correlated TL/TAC peaks, that the model fails to describe adequately the experimental results. We present arguments that the actual system probably possesses significant spatial correlation between trapped carriers and optically active recombination centers.