STRETCHED-EXPONENTIAL DECAY OF THE LUMINESCENCE IN ZNSE-ZNTE SUPERLATTICES

The photoluminescence decay of fractional-layer superlattices of ZnSe- ZnTe has been measured to investigate the origin of ''slow-bands'' (K. Suzuki et al. [4]). The decay of this band is found to be well descri bed by a stretched exponential function. Distributions of effective li fe-time of excitons at several wavelength positions of the bands are d erived from the stretched exponential parameters with which the decay is fitted. From the distributions, the radiative life-time of localize d excitons in the slow bands are estimated to be 10-20 ns. (C) 1998 El sevier Science Ltd.