Rapid radiative decay of charged excitons

We discuss the decay process of free trions, which differs radically from that of the neutral exciton or localized trions. A theoretical model for the decay time of free trions shows that due to the three particle decay process a rapid radiative decay, compared to the neutral exciton, is expected. We demonstrate the rapid decay of negatively charged excitons in remotely doped GaAs/AlGaAs quantum wells (QW's) experimentally and show the effects of temperature and well-width on the decay of free negatively charged excitons.