Exciton-like luminescence of KCl matrix under thermoelastic, local and uniaxial deformation
Abstract
The radiative relaxation of exciton-like formations in KCl-Na single crystal has been studied by experimental methods of luminescent spectroscopy. The amplifying effect of the radiation intensity with a maximum at 2.8 eV up to 500 times as compared to pure KCl has been detected in KCl-Na. The luminescence efficiency of an exciton-like formation increases with rise in: sodium ions concentration ( 10 ÷ 1000 ppm), thermal exposure ( 500◦C ÷ 600◦C ) and the degree of uniaxial deformation along <100> and <110> crystallographic directions. Previously, such a scale of the luminescence enhancement effect has not been registered in KCl matrix at room temperature. At high sodium concentrations (1000 ppm) in KCl-Na crystals, the additional intense emission with a maximum at 3.1 eV has also been revealed, which is typical for pair sodium ions. It is interpreted that the exciton-like formation in the sodium field with the maximum quantum yield of luminescence is formed by recombination assembly of electron-hole pairs due to the mobility of unrelaxed holes.
About the Authors
K. Shunkeyev
K. Zhubanov Aktobe regional university
Kazakhstan
Kazakhstan
Aktobe
A. Tilep
K. Zhubanov Aktobe regional university
Kazakhstan
Kazakhstan
Aktobe
A. Lushchik
University of Tartu
Estonia
Estonia
Tartu
Sh. Sagimbayeva
K. Zhubanov Aktobe regional university
Kazakhstan
Kazakhstan
Aktobe
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Review
Supporting agencies: This research work has been funded within the framework of the grant funding project of the Science Committee of the Ministry of Education and Science of the Republic of Kazakhstan (IRN AP08855672).
For citations:
Shunkeyev K., Tilep A., Lushchik A., Sagimbayeva S. Exciton-like luminescence of KCl matrix under thermoelastic, local and uniaxial deformation. Eurasian Journal of Physics and Functional Materials. 2022;6(2):139-150. https://doi.org/10.32523/ejpfm.2022060206
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