A model for luminescence of localized state ensemble
arXiv:cond-mat/0411128 · doi:10.1209/epl/i2005-10170-7
Abstract
A distribution function for localized carriers, $f(E,T)=\frac{1}{e^{(E-E_a)/k_BT}+Ï_{tr}/Ï_r}$, is proposed 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.
14 pages, 4 figures