Exciton-like luminescence of KCl matrix under thermoelastic, local and uniaxial deformation
Shunkeyev K. Tilep A. Lushchik A. Sagimbayeva Sh.
2022L.N. Gumilyov Eurasian National University
Eurasian Journal of Physics and Functional Materials
2022#6Issue 2139 - 150 pp.
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
Alkali halide crystals , Electron-hole recombination , Exciton-like formation , Exciton-like luminescence , Local and uniaxial deformation , Quenching , Self-trapped exciton , X-ray luminescence
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K. Zhubanov Aktobe regional university, Aktobe, Kazakhstan
University of Tartu, Tartu, Estonia
K. Zhubanov Aktobe regional university
University of Tartu
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