Further investigations of tunneling recombination processes in random distributions of defects |
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| Affiliation: | 1. Physics Department, McDaniel College, Westminster, MD 21157, USA;2. Nuclear Physics Laboratory, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;1. Faculty of Engineering and Technology, Multimedia University, 75450 Malacca, Malaysia;2. Physics Section, School of Distance Education, Universiti Sains Malaysia, 11800 Penang, Malaysia;3. Faculty of Engineering, Multimedia University, 20100 Cyberjaya, Selangor, Malaysia;4. Institute of Nuclear Physics, Polish Academy of Sciences, Radzikowskiego 152, 31-342 Krakow, Poland;5. Department of Imaging, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia;6. Photonics Research Group, Department of Electrical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;7. Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia;8. Telekom Research & Development Sdn. Bhd, Idea Tower, UPM-MTDC, Technology Incubation Center One, Lebuh Silikon, 43400 Serdang, Selangor, Malaysia;9. Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom;10. Department of Physics, University of Malaya, 50603 Kuala Lumpur, Malaysia;11. Department of Physics, College of Science, Al Imam Mohammad Bin Saud Islamic University, Riyadh 11623, Saudi Arabia;1. Cukurova University, Arts-Sciences Faculty, Physics Department, 01330 Adana, Turkey;2. Uludag University, Faculty of Arts and Sciences, Department of Physics, Gorukle Campus, 16059 Bursa, Turkey;3. Manisa Celal Bayar University, Faculty of Arts and Sciences, Department of Physics, Muradiye, Manisa, Turkey;4. Physics Department, Jazan University, P.O. Box 114, 45142 Jazan, Saudi Arabia;1. Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel;2. Redwood Scientific Incorporated, Pacifica CA94044-4300, USA;3. Physics Department, McDaniel College, Westminster, MD21157, USA;2. Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada;3. Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada;4. Department of Medicine, McMaster University, Hamilton, Ontario, Canada |
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| Abstract: | The shape of infrared stimulated luminescence signals (IRSL) from feldspars has been the subject of numerous studies in the field of luminescence dating. Specifically linearly modulated IRSL signals (LM-IRSL) are commonly assumed to consist of several first order components corresponding to distinct optical stimulation cross sections. This paper models the shape of LM-IRSL signals using a recently proposed kinetic model, which describes localized electronic recombination in donor–acceptor pairs of luminescent materials. Within this model, recombination is assumed to take place via the excited state of the donor, and nearest-neighbor recombinations take place within a random distribution of centers. The model has been used previously successfully to describe both thermally and optically stimulated luminescence (TL, OSL). This paper shows that it is possible to obtain approximate solutions for the distribution of donors in the ground state as a function of two variables, time and the distance between donors and acceptors. Approximate expressions are derived for several possible modes of optical and thermal stimulation, namely TL, OSL, linearly modulated OSL (LM-OSL), LM-IRSL and isothermal TL (ITL). Numerical integration of these expressions over the distance variable yields the distribution of remaining donors at any time t during these experimental situations. Examples are given for the derived distributions of donors in each experimental case, and similarities and differences are pointed out. The paper also demonstrates how LM-IRSL signals in feldspars can be analyzed using the model, and what physical information can be extracted from such experimental data. The equations developed in this paper are tested by fitting successfully a series of experimental LM-IRSL data for Na- and K-feldspar samples available in the literature. Finally, it is shown that the equations derived in this paper are a direct generalization of an equation previously derived for the case of ground state tunneling. |
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| Keywords: | Stimulated luminescence emission Feldspars Tunneling Thermoluminescence TL Infrared stimulated luminescence IRSL OSL Kinetic model Random defect distribution |
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