Abstract
The fine structures in the luminescence spectra of GaSe in the photon energy range from 2.10 to 2.11 eV are assigned for the first time in terms of the effects that the stacking fault gives rise to splitting the 1s triplet state of the direct free exciton. The assignment has been made possible by the simultaneous measurement of the spectra for both photoluminescence and reflection/absorption, at 4.2K, which are obtained from a crystal grown by Bridgman's method.
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