Exciton States of Lithium Hydride in LiH_1−xF_x Solid Solutions

Abstract

Abstract Exciton states of LiH 1− x F x in the exciton band of lithium hydride are investigated by optical methods. It was found that spectra of the lowest‐energy exciton band of these crystals follow the persistent type of behaviour. The relation of exciton energy to solution composition points to the effect of symmetry changes of the conduction band bottom and average sizes of lithium hydride clusters. The structure of the luminescence spectra is determined by direct, phonon‐forbidden indirect, or disorder‐assisted quasidirect transitions with increasing fluorine content.