1. Institute for Scintillation Materials of the National Academy of Sciences of Ukraine, Nauky Ave. 60, 61072 Kharkiv, Ukraine
2. Department of Metals and Semiconductors Physics, National Technical University «Kharkiv Polytechnic Institute», Kyrpychova Str. 2, 61002 Kharkiv, Ukraine
3. Institute of Quantum Optics, Leibniz University Hannover, Welfengarten 1, 30167 Hannover, Germany
4. Department of Biomedical Engineering, Kharkiv National University of Radio Electronics, Nauky Ave. 14, 61166 Kharkiv, Ukraine