Exciton Dynamics of GaAs / AlGaAs Quantum Wells

We present a study of exciton relaxation in GaAs/AlGaAs quantum well structures by using time-resolved photoluminescence techniques. We observed that light-hole exciton has a longer decay time than heavy-hole exciton, which results from the difference of the exciton population factor. We considered the thermal population time to explain the observed exciton dynamics.