Abstract
Urbach behaviour of the absorption edge of Cu 6 PS 5 Br(I). crystals are explained by exciton-phonon interaction (EPI). The mechanism of EPI is well described in the framework of the Dow-Redfield theory according which excitons are interacted with microelectric fields, generated by LO phonons. The characteristic Urbach's energy w reflect not only the influence of termal vibrations but also the influence of two sorts of structural disordering: 1) the dynamic structural disordering due to the migration of ions Cu + and 2) the static structural disordering due to differences in the crystals preparation procedure
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