Abstract
Abstract Energy-transfer and self-trapping processes of orthoexcitons and paraexcitons in alkali iodides are studied. Intensities of emission bands caused by Tl+ impurities and the self-trapped excitons are measured with varying temperature and excitation photon-energy. It is clarified that free excitons participating in the energy transfer to Tl+ in KI and RbI are mainly paraexcitons. The intensity of the σ band increases gradually with elevating temperature in KI. The increase of the intensity will be attributed to a thermally activated process over a potential barrier.
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