Luminescence of BaFBr and BaF2 Crystals Irradiated by Swift Krypton Ions
Kenbayev D. Akilbekov A. Dauletbekova A. Aralbayeva G. Saduova B. Knyazev M.
December 2025Multidisciplinary Digital Publishing Institute (MDPI)
Crystals
2025#15Issue 12
In this study, radiation damage in BaFBr and BaF2 crystals irradiated with 147 MeV 84Kr ions up to fluences of (1010–1014) ions/cm2 was investigated using X-ray excited optical luminescence (XEOL) and pulsed cathodoluminescence (PCL). The effect of oxygen impurities present in the studied crystals was also considered. XEOL spectra revealed bands associated with oxygen impurities occupying halide sites, as well as luminescence bands with maxima at approximately 2.81 eV, 3.7–4 eV, and 2.3 eV. The luminescence at 2.81 eV can be attributed to the recombination of electrons released during X-ray irradiation with holes trapped at specific sites (Type I, PL). The observed highly energetic luminescence is most likely due to perturbed exciton. Such a perturbed exciton can be formed in the configuration F + Vk ((Formula presented.)) in the presence of the neighboring impurity ion (Formula presented.). Oxygen impurities play an important role in the formation mechanisms of these centers. High radiation doses lead to crystal degradation. Excitation by a high-power electron pulse induces excitonic luminescence near the oxygen impurity at 4.2 eV. A distinctive feature of the 4.2 eV emission band is its strong intensity at high temperatures. In the decay kinetics of the PCL spectra, a fast component in the nanosecond range dominates, which remains independent of fluence in BaFBr and BaF2 crystals irradiated with krypton ions.
BaF2 , BaFBr , impurity , luminescence , pulsed cathodoluminescence , swift heavy ions , X-ray luminescence
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Department of Physics and Informatics, Graduate School of STEM Education, Shakarim University, Glinka St. 20A, Semey, 071412, Kazakhstan
Institute of Physical and Technical Sciences, L.N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
Department of Physics and Informatics
Institute of Physical and Technical Sciences
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