A model for steady-state luminescence of localized-state ensemble
Abstract
A distribution function for localized carriers, f(E,T) = 1/(e(E - Ea)/kBT + τtr/τr), 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.
- Publication:
-
EPL (Europhysics Letters)
- Pub Date:
- September 2005
- DOI:
- 10.1209/epl/i2005-10170-7
- arXiv:
- arXiv:cond-mat/0411128
- Bibcode:
- 2005EL.....71..994L
- Keywords:
-
- Other
- E-Print:
- 14 pages, 4 figures