Based on the observation of free exciton luminescence at room temperature, self trapping of excitons is recognized in β-perylene crystals which have a monomeric structure. Temperature dependence of the luminescence spectra suggests the existence of two sorts of self trapped states. The result obtained are consistent with those anticipated by the analysis of the Urbach rule in β-perylene.
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Matsui et al. (1982) studied this question.
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