Modelling of decay kinetics of self-trapped exciton luminescence in CdWO 4 under femtosecond laser excitation in absorption saturation conditions

Abstract

The analytical expressions for the three-dimensional spatial distribution of excitons and luminescence decay kinetics of wide band-gap crystals were derived taking into account the saturation effect for absorption near the centre of the incident laser beam with Gaussian transversal profile. The model is verified for the excitonic emission of CdWO 4 crystals under excitation by ultra-short laser pulses in the region of weak excitonic absorption. © 2012 Versita Warsaw and Springer-Verlag Wien.