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Exciton and intracenter luminescence in Cd0.6Mn0.4Te/Cd0.5Mg0.5Te quantum-well structures

  • Low-Dimensional Systems and Surface Physics
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Abstract

Exciton luminescence and intracenter luminescence (IL) of Mn2+ ions in Cd0.6Mn0.4Te/Cd0.5Mg0.5Te structures with quantum wells (QWs) 7, 13, and 26 monolayers thick were studied. It was established that in QWs the intensity of exciton luminescence with respect to that of IL is a few orders of magnitude higher than that in bulk crystals. The spectral position of manganese IL profile changes noticeably in going from a bulk crystal to a QW of the same composition. The nonexponential parts of the IL decay curves are determined by excitation migration and the cooperative upconversion process, whose contribution is high under strong excitation and efficient migration. At 77 K, the IL decay constant τ within the exponential region increases with decreasing QW thickness. The decay constant τ in a QW, unlike in a bulk Cd0.5Mn0.5Te crystal, decreases substantially under cooling from 77 to 4 K.

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Authors and Affiliations

  1. Fock Institute of Physics, St. Petersburg State University, ul. Ul’yanovskaya 1, Petrodvorets, St. Petersburg, 198504, Russia

    V. F. Agekyan, N. N. Vasil’ev, A. Yu. Serov & N. G. Filosofov

  2. Institute of Physics, Polish Academy of Sciences, Warsaw, 02-668, Poland

    G. Karczewski

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  1. V. F. Agekyan
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  2. N. N. Vasil’ev
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  3. A. Yu. Serov
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  4. N. G. Filosofov
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  5. G. Karczewski
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__________

Translated from Fizika Tverdogo Tela, Vol. 47, No. 11, 2005, pp. 2074–2079.

Original Russian Text Copyright © 2005 by Agekyan, Vasil’ev, Serov, Filosofov, Karczewski.

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Agekyan, V.F., Vasil’ev, N.N., Serov, A.Y. et al. Exciton and intracenter luminescence in Cd0.6Mn0.4Te/Cd0.5Mg0.5Te quantum-well structures. Phys. Solid State 47, 2162–2168 (2005). https://doi.org/10.1134/1.2131163

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