Abstract
Measurements of the photoluminescence from epitaxial layers of Pb1 − x Eu x Te alloys with 0 ≤ x ≤ 0.32 are carried out. It is found that the luminescence intensity decreases with increasing Eu content and, already for x as low as about 0.1, drops by more than one order of magnitude. No luminescence is observed for 0.2 < x ≤ 0.32. This behavior is explained by the fact that, for x ≈ 0.1, the absolute minimum in the conduction band changes from the L to X point, which results in the scattering of nonequilibrium electrons to the X valley and, thus, causes a decrease in the quantum efficiency of the emission. According to published data, for x > 0.85, optical transitions also take place with the participation of the X valley; in this case, the emission is governed by the formation of magnetic polarons. The temperature dependences of the band gap are determined for 0 ≤ x ≤ 0.11. These dependences have a wide linear region characterized by a positive dE g /dT coefficient, which decreases with the Eu content to become negative in pure EuTe.
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Original Russian Text © D.A. Pashkeev, I.I. Zasavitskiy, 2013, published in Fizika i Tekhnika Poluprovodnikov, 2013, Vol. 47, No. 6, pp. 745–750.
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Pashkeev, D.A., Zasavitskiy, I.I. Role of intervalley scattering in the radiative recombination in Pb1 − x Eu x Te alloys (0 ≤ x ≤ 1). Semiconductors 47, 755–760 (2013). https://doi.org/10.1134/S1063782613060201
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DOI: https://doi.org/10.1134/S1063782613060201