A model for steady-state luminescence of localized-state ensembleQ. Li, S. J. Xu, M. H. Xie and S. Y. Tong
Department of Physics and HKU-CAS Joint Laboratory on New Materials The University of Hong Kong - Pokfulam Road, Hong Kong, PRC
received 3 February 2005; accepted in final form 12 July 2005
published online 10 August 2005
A distribution function for localized carriers, , is obtained by solving a rate equation, in which electrical carriers' generation, thermal escape, recapture and radiative recombination are taken into account. Based on this distribution function, a model is developed for luminescence from localized-state ensemble with a Gaussian-type density of states. The model reproduces quantitatively all the anomalous temperature behaviors of localized-state luminescence. It reduces to the well-known band-tail and luminescence quenching models under certain approximations.
78.55.-m - Photoluminescence, properties and materials.
71.23.An - Theories and models; localized states.
78.60.-b - Other luminescence and radiative recombination.
© EDP Sciences 2005