Exciton and intracenter radiative recombination in ZnMnTe and CdMnTe quantum wells with optically active manganese ions |
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| Authors: | V. F. Agekyan I. Akai N. N. Vasil’ev T. Karasawa G. Karczewski A. Yu. Serov N. G. Filosofov |
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| Affiliation: | (1) Fock Institute of Physics, St. Petersburg State University, Ulyanovskaya ul. 1, St. Petersburg, Peterhof, 198504, Russia;(2) Osaka City University, Sugimoto-cho, Osaka 558, Japan;(3) Institute of Physics, Polish Academy of Sciences, Warsaw, 02-668, Poland |
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| Abstract: | The emission spectra of Zn1?x Mn x Te/Zn0.6Mg0.4Te and Cd1?x Mn x Te/Cd0.5Mg0.5Te quantum-well structures with different manganese concentrations and quantum-well widths are studied at excitation power densities ranging from 105 to 107 W cm?2. Under strong optical pumping, intracenter luminescence of Mn2+ ions degrades as a result of the interaction of excited managanese ions with high-density excitons. This process is accompanied by a strong broadening of the emission band of quantum-well excitons due to the exciton-exciton interaction and saturation of the exciton ground state. Under pumping at a power density of 105 W cm?2, stimulated emission of quantum-well excitons arises in CdTe/Cd0.5Mg0.5Te. The luminescence kinetics of the quantum-well and barrier excitons is investigated with a high temporal resolution. The effect of the quantum-well width and the managanese concentration on the kinetics and band shape of the Mn2+ intracenter luminescence characterized by the contribution of the manganese interface ions is determined. |
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