Temperature dependence of photoluminescence intensity and decay in GeSe2 glass

The intensity and decay profile of the photoluminescence (PL) in grassy GeS e2 are measured as a function of temperature from 7 to 200 K. The intensity decreases exponentially in the temperature region >100 K. The complicated temperature dependence of the decay profile as well as the dependence of th e intensity are explained in a unified framework by adopting a model of the luminescent sites whose thermal activation energy for the non-radiative pr ocess is distributed. We show that the intensity variation is affected by t he non-radiative process while the decay life time depends almost only on t he radiative transition rate. (C) 2000 Elsevier Science B.V. All rights res erved.