Role of Afterglow in Optically Stimulated Luminescence of YAP:Mn

S. Ubizskiia, O. Poshyvaka, D. Afanassyeva, A. Luchechkoa, b, V. Rabykb, Ya. Zhydachevskyya, c aLviv Polytechnic National University, Bandera St., 12, 79013 Lviv, Ukraine bIvan Franko National University of Lviv, Universytetska St., 1, 79000 Lviv, Ukraine cInstitute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, PL-02668 Warsaw, Poland

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The afterglow of the YAlO3:Mn2+ single crystals irradiated with X-rays (45 kV, 0.3 mA) is studied to understand its role in the behavior of the optically stimulated luminescence, which is observed during pulsed stimulation with blue light (470 nm) of a pre-irradiated crystal. In non-irradiated crystal the same light does not have this effect. It is shown that long lasting afterglow and optically stimulated luminescence response follow the hyperbolic kinetics with the power in denominator less than one. It confirms the common nature of both phenomena, which is likely explained by the presence of several types of defects in the studied crystal, competing in trapping/re-trapping and releasing the carriers during the irradiation and relaxation. On the other hand, it was find out that the initial part of optically stimulated response demonstrates exponentials relaxation. A technique which uses the revealed peculiarity is proposed and tested to determine the absorbed dose of irradiation from the optically-stimulated luminescence in YAlO3:Mn2+ crystal.

DOI:10.12693/APhysPolA.141.379 topics: YAlO3:Mn2+ (YAP:Mn), afterglow, optically stimulated luminescence, Becquerel decay function