Monte Carlo simulations of luminescence processes under quasi-equilibrium (QE) conditions |
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| Institution: | 1. School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia;2. School of Distance Education, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia;3. Faculty of Engineering and Technology, Multimedia University, Jalan Ayer Keroh Lama, 75450 Melaka, Malaysia;1. Centro de Investigação em Química, Department of Chemistry and Biochemistry, Faculty of Science, University of Porto, Rua do Campo Alegre, s/n, P-4169-007 Porto, Portugal;2. Division of Applied Physical Chemistry, Department of Chemistry, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden;3. Department of Chemical Engineering, Ben-Gurion University of the Negev, 84105 Beer-Sheva, Israel;4. Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, 84105 Beer-Sheva, Israel;1. Graduate School of Engineering, Tokyo University of Science Yamaguchi, Daigaku-dori, SanyoOnoda, Yamaguchi 756-0884, Japan;2. Department of Applied Chemistry, Faculty of Engineering, Tokyo University of Science Yamaguchi, Daigaku-dori, SanyoOnoda, Yamaguchi 756-0884, Japan;3. Professor Emeritus, Tokyo University of Science Yamaguchi, Japan;1. Department of Chemistry, Yonsei University, 50 Yonsei-ro, Seodaemun-Gu, Seoul, 03722, South Korea;2. Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-Gu, Seoul, 03722, South Korea |
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| Abstract: | Previous researchers have carried out Monte Carlo simulations of thermoluminescence (TL) phenomena by considering the allowed transitions of charge carriers between the conduction band, electron traps and recombination centers. Such simulations have demonstrated successfully the effect of trap clustering on the kinetics of charge carriers in a solid, and showed that trap clustering can significantly change the observed luminescence properties. While such Monte Carlo simulations have been carried out for TL, there has been no such trap clustering studies for optically stimulated luminescence phenomena (OSL). This paper presents a simplified method of carrying out Monte Carlo simulations for TL and linearly modulated optically stimulated luminescence (LM-OSL) phenomena, based on the General One Trap (GOT) model, which is a special case of the one trap one recombination center model (OTOR) when quasi-equilibrium conditions (QE) hold. The simulated results show that the presence of small clusters consisting of a few traps in a solid can lead to multiple peaks in both the TL and LM-OSL signals. The effects of retrapping and degree of trap filling are simulated for such multi-peak luminescence signals, and insight is obtained into the mechanism producing these peaks. The method presented in this paper can be easily generalized for other types of luminescence solids in which the recombination probability varies with time. |
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| Keywords: | Thermoluminescence LM-OSL Monte Carlo simulations GOT kinetic model |
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