The Effect of 147 MeV 84Kr and 24.5 MeV 14N Ions Irradiation on the Optical Absorption, Luminescence, Raman Spectra and Surface of BaFBr Crystals
Akilbekov A. Kenbayev D. Dauletbekova A. Shalaev A. Akylbekova A. Aralbayeva G. Baimukhanov Z. Baizhumanov M. Elsts E. Popov A.I.
June 2024Multidisciplinary Digital Publishing Institute (MDPI)
Crystals
2024#14Issue 6
Today, BaFBr crystals activated by europium ions are used as detectors that store absorbed energy in metastable centers. In these materials, the image created by X-ray irradiation remains stable in the dark for long periods at room temperature. As a result, memory image plates are created, and they are extended to other types of ionizing radiation as well. Despite significant progress towards X-ray storage and readout of information, the mechanisms of these processes have not been fully identified to date, which has hindered the efficiency of this class of phosphors. In this study, using photoluminescence (PL), optical absorption (OA), Raman spectroscopy (RS), and atomic force microscopy (AFM), the luminescence of oxygen vacancy defects to BaFBr crystals irradiated with 147 MeV 84Kr and 24.5 MeV 14N ions at 300 K to fluences (1010–1014) ion/cm2 was investigated. BaFBr crystals were grown by the Shteber method on a special device. Energy-dispersive X-ray spectroscopy (EDX) analysis revealed the presence of Ba, Br, F, and O. The effect of oxygen impurities present in the studied crystals was considered. The analysis of the complex PL band, depending on the fluence and type of ions, showed the formation of three types of oxygen vacancy defects. Macrodefects (tracks) and aggregates significantly influence the luminescence of oxygen vacancy defects. The creation of hillocks and tracks in BaFBr crystals irradiated with 147 MeV 84Kr ions is shown for the first time. Raman spectra analysis confirmed that BaFBr crystals were amorphized by 147 MeV 84Kr ions due to track overlap, in contrast to samples irradiated with 24.5 MeV 14N ions. Raman and absorption spectra demonstrated the formation of hole and electron aggregate centers upon swift heavy ions irradiation.
BaFBr , oxygen impurity , oxygen-vacancy defects , photoluminescence , swift heavy ions , track
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Department of Technical Physics, L.N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
Department of Physical-Mathematical Sciences and Informatics, Shakarim University of Semey, Semey, 071412, Kazakhstan
Vinogradov Institute of Geochemistry SB RAS, Irkutsk, 664033, Russian Federation
Institute of Solid State Physics, University of Latvia, Riga, LV-1063, Latvia
Department of Technical Physics
Department of Physical-Mathematical Sciences and Informatics
Vinogradov Institute of Geochemistry SB RAS
Institute of Solid State Physics
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