A review of experimental data on the time dependence of luminescent decay in solids shows very few examples of the classically expected exponential dependence and none of the bimolecular law. The prevailing long-term time dependence obeys power laws in time with exponents between -1 and -2. It is suggested that the widely applicable power-law dependence is the result of many-body interactions dominating the dynamics of charge release from trapping centres. A simple model involving either one or two sets of such trapping centres can explain most of the observed features of transient response under short excitation. A qualitative physical mechanism is proposed for the power-law response.
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Jonscher et al. (1984) studied this question.
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