Photoluminescence and multiphonon resonant Raman scattering in Ni-and Co-doped Zn1?x
MnxTe crystals |
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Authors: | Yu P Gnatenko O A Shigil’chev E Rutkovskii G Contreras-Puente M Cardenas-Garcia |
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Institution: | (1) Institute of Physics, Ukrainian National Academy of Sciences, 252022 Kiev, Ukraine |
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Abstract: | Low-temperature photoluminescence, exciton reflection, and multiphonon resonant Raman scattering spectra of Ni-and Co-doped
Zn1−x
MnxTe crystals were investigated. Intense emission occurs in a broad spectral region (1100–17 000 cm−1) in the crystals containing Ni atoms. It is caused by intracenter transitions involving Mn2+ ions and transitions between the conduction band and a level of the doubly charged acceptor. The features of the exciton
photoluminescence and multiphonon resonant Raman scattering involving longitudinal-optical (LO) phonons at various temperatures
are investigated. The insignificant efficiency of the localization of excitons on potential fluctuations in the Zn1−x
MnxTe:Co crystals is established. A temperature-induced increase in the intensity of the 5LO multiphonon resonant Raman scattering
line due to the approach of the conditions for resonance between this line and the ground exciton state is observed in these
crystals.
Fiz. Tverd. Tela (St. Petersburg) 40, 616–621 (April 1998) |
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Keywords: | |
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