Luminescence of self-trapped excitons in alkali halide crystals at low temperature uniaxial deformation

The processes of temperature quenching of the luminescence of the self-trapped excitons (STEs) from 93 to 200 K in the conditions of applied elastic low-temperature deformation for several alkali-halide crystals (AHCs) are presented in the paper. The theoretical explanation of the influence of low-t...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2020-02, Vol.464, p.95-99
Main Authors: Myasnikova, L., Shunkeyev, K., Zhanturina, N., Ubaev, Zh, Barmina, A., Sagimbaeva, Sh, Aimaganbetova, Z.
Format: Article
Language:English
Subjects:
Alkali-halide crystals
Elastic uniaxial deformation
Exciton-phonon interaction
Luminescence
Self-trapped exciton
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Summary:The processes of temperature quenching of the luminescence of the self-trapped excitons (STEs) from 93 to 200 K in the conditions of applied elastic low-temperature deformation for several alkali-halide crystals (AHCs) are presented in the paper. The theoretical explanation of the influence of low-temperature uniaxial deformation on the formation of the luminescence of the STEs was done. The increase in activation energy of the temperature quenching of the luminescence of the STEs, narrowing of the emission bands, increase in the frequency of the active oscillations of the STEs and the decrease in the Huang-Rhys parameter are shown as the results. These changes indicate a weakening of the exciton-phonon interaction in elastically deformed AHCs, which, in turn, leads to an increase in the probability of radiative annihilation of excitons.
ISSN:0168-583X
1872-9584
DOI:10.1016/j.nimb.2019.12.014