Abstract
Emission intensities, lifetimes and their temperature dependence of the UV-emission in the CdI 2 :Br mixed crystals were investigated from 1.7 to 50 K by varying the Br - concentration and the excitation energy. The UV-emission is observed in the region between 3.30 and 3.45 eV and diminishes as increasing the concentration of CdBr 2 . The UV-emission decays with three exponential components: τ S =83 µs, τ M =24 µs and τ F =2.3 µs at 1.7 K. It has been proved that the initial state of the τ S -component and that of the τ M - and τ F -components are quite distinct from each other. In order to explain the present experimental results three exciton relaxation processes into the UV-states are proposed, that is, the tunneling and the thermal activation processes from the bottom of the indirect free exciton band and the direct process from the upper states of excitons.
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