High-temperature Exciton-like Luminescence in KCl:Na Crystals
Shunkeyev K. Sagimbayeva S. Kenzhebayeva A. Zorenko Y.
2025L.N. Gumilyov Eurasian National University
Eurasian Journal of Physics and Functional Materials
2025#9Issue 132 - 42 pp.
The emission spectra of high-temperature peaks of thermally stimulated luminescence (TSL) in the 300 K → 800 K range have been recorded in KCl:Na crystals for the first time. In KCl:Na (1000 ppm), a prominent TSL peak at 575 K has been identified, featuring luminescence bands peaking at 2.8 eV and 3.1 eV, attributed to radiative recombination of excitons bound with single and pair sodium based centers. This effect persists after the thermal treatment of KCl:Na crystals through high-temperature annealing, which ensures the central positioning of sodium ions in the lattice sites of cations, as confirmed by X-ray and tunnel luminescence spectra. Calculations of temperature-dependent jump frequencies of vacancies reveal that cation vacancies predominantly contribute to the breakdown of halide formations in the Type I TSL peaks (400 K) region, while at consideration of nature for the Type II peaks (555 K), the involvement of anion vacancies must also be taken into account. The thermal dissociation of halide formations, driven by the mobility of both cation and anion vacancies in KCl:Na (1000 ppm), generates a flux of non-relaxed holes (eþ), which recombine with electrons (e¡) in the field of sodium ions. As a result of such recombination, high-temperature exciton-like luminescence ðe0SLðNaþc ÞÞ is produced with a maximal light yield at 575 K. The last property is particularly relevant for temperature stable scintillation detectors and dosimeters. 2616-8537/
Alkali halide crystals , High-temperature exciton-like luminescence , High-temperature thermally stimulated luminescence , Tunnel luminescence , X-ray luminescence
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“Radiation Physics of Materials” Scientific Center, K. Zhubanov Aktobe Regional University, 34 A. Moldagulova Ave., Aktobe, 030000, Kazakhstan
Department of Physics, Kazmierz Wielki University in Bydgoszcz, Powstancow Wielkopolskich str., 2, Bydgoszcz, 85-0906, Poland
“Radiation Physics of Materials” Scientific Center
Department of Physics
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