Acoustic driving effect on radiative decays of excitons in ZnSe ZnS singlequantum wells

We report that acoustic driving of ZnSe/ZnS quantum wells can yield greater than or equal to 30% shortening of the fast component (on the order of 10( 2) ps) of exciton radiative decays and relatively enhanced tail emissions a t greater instants. The shortening is attributed to the driving-induced rel ocalization of excitons to lower-energy states while the enhancement is ind icative of the drift diffusion of mobile populations in the driving electri c field. These results suggest that the radiative recombination predominant ly occurs from localized excitons. (C) 1999 American Institute of Physics. [S0003-6951(99)02521-8].