The zero-phonon luminescence of free indirect-excitons and its phonon-replicas have been observed near the absorption edge in CdI 2 : Br in addition to the momentum-conserving luminescence assisted by the emission of phonons. The edge luminescence, as a whole, is enhanced at first by the mixing of CdBr 2 , but becomes weak as the Br - concentration increases beyond 5 mole percent. It is deduced from the temperature dependence of the luminescence spectrum that free excitons have a common lifetime, and that the lifetime is governed by three (two thermal and a non-thermal) relaxation processes. The dependence of the intensity of edge luminescence on the Br - concentration is attributable to the changes induced in the lifetime of free excitons.
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Hayashi et al. (1981) studied this question.
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