Exciton-Like luminescence in a KBr crystal exposed to uniaxial elastic deformation
Shunkeyev K. Lushchik A. Sagimbayeva S. Ubaev Z. Tilep A.
February 2024Elsevier B.V.
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
2024#547
The effect of a low-temperature uniaxial deformation (85 K, along the 〈1 1 0〉 or 〈1 0 0〉 directions) on the radiative decay of electronic excitations has been studied in pure KBr single crystals doped with sodium ions. As the deformation increases (up to approximately ε ≈ 1.0 %), the X-ray luminescence bands of both, self-trapped excitons (the σ and π emission bands peaked at 4.4 and 2.3 eV, respectively) and exciton-like formations associated with sodium impurity ions increase linearly. In KBr:Na, the recombination formation of bound excitons near single Na+ and pair Na+-Na+ impurity centers leads to luminescence bands at 2.85 and 3.1 eV, respectively.
Alkali halide crystals , Luminescence of self-trapped and bound excitons , Uniaxial elastic deformation , X-ray luminescence
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K. Zhubanov Aktobe Regional University, 34 Moldagulova Avenue, Aktobe, 030000, Kazakhstan
Institute of Physics, University of Tartu, 1 W. Ostwald Street, Tartu, 50411, Estonia
K. Zhubanov Aktobe Regional University
Institute of Physics
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