Abstract
Excitation transfer among localized states has often been neglected for semiconductor luminescence. We have recently shown that such transfer is far more prevalent in the low temperature luminescence in ZnSe than had been realized. In this work, we studied the temperature dependence of the luminescence, and observed the phonon-assisted transfer between two bound excitons at relatively high temperature. This observation correlates with the result of a theoretical model consisting of a two-level system. Our results also show that excitation transfer may well be playing a role in the origin of the blue room temperature luminescence in ZnSe.
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