Single photon emission from donor bound excitons in ZnSe quantum wells

Donor impurities in ZnSe have been shown to create shallow bound excitons. The radiative recombination of such bound excitons can be employed for single-photon generation. In this study, we investigate Cl doped ZnSe quantum wells for their radiative properties. We demonstrate single-photon generation from Cl-bound excitons. We support our findings with photoluminescence excitation (PLE) and resonant photoluminescence measurements. In addition, we characterize the temperature-dependent lifetime of the emission and discuss the possible decay mechanisms. Lastly, we investigate the Zeeman levels of the ground state electron by performing magneto-spectroscopy.