Exciton and intracenter radiative recombination in ZnMnTe and CdMnTe quantum wells with optically active manganese ions

摘要

-The emission spectra of Zn1-xMnxTe/Zn0.6Mg0.4Te and Cd1-x MnxTe/Cd0.5Mg0.5Te quantum-well structures with different manganese concentrations and quanturn-well widths are studied at excitation power densities ranging from 10(5) to 10(7) W cm(-2) Under strong optical pumping, intracenter luminescence of Mn2+ ions degrades as a result of the interaction of excited manoanese ions with high-density excitons. This process is accompanied by a strong broadening of the emission band of quanturn-well excitons due to the exciton-exciton interaction and saturation of the exciton-round state. Under pumping at a power density of 10(5) W cm(-2), stimulated emission of quanturn-well excitons arises in CdTe/Cd0.5Mg0.5Te. The luminescence kinetics of the quanturn-well and barrier excitons is investigated with a high temporal resolution. The effect of the quantum-well width and the manganese concentration on the kinetics and band shape of the Mn 2, intracenter luminescence characterized by the contribution of the manganese interface ions is determined.