- Title
- Factors influencing the shape of CW-OSL signal obtained by stimulation of very deep traps in carbon-doped aluminium oxide: an experimental study
- Creator
- Nyirenda, Angel N, Chithambo, Makaiko L
- Date
- 2017
- Type
- text
- Type
- article
- Identifier
- http://hdl.handle.net/10962/115493
- Identifier
- vital:34149
- Identifier
- https://doi.org/10.1016/j.jlumin.2017.07.016
- Description
- The optically stimulated luminescence from carbon-doped aluminium oxide (α-Al2O3:C) displays a peak with time under certain measurement conditions. In this paper, we present factors that influence the peak-like shape of continuous-wave optically stimulated luminescence (CW-OSL) signal. The report is based on the experimental study of OSL signals obtained by stimulation of very deep traps in α-Al2O3:C. Methods exploiting post-irradiation annealing, variable dose and temperature dependent OSL measurements were used in the investigation. It is found that the rising part of the CW-OSL peak is obtained when the rate of retrapping at the most optically active trap (main trap) exceeds the rate of direct radiative recombination following optical release of charges from all optically active traps. This is possible if, during optical stimulation, the primary trap responsible for OSL i.e. the main trap, is substantially unoccupied and the very deep, donor traps are substantially filled up. The rate of charge retrapping itself is deduced to depend on the occupancy of the acceptor traps i.e. shallow, main and secondary traps; concentration of charge carriers in the very deep, donor traps; the post-irradiation annealing temperature and the temperature at which the OSL is measured.
- Format
- 7 pages, pdf
- Language
- English
- Relation
- Journal of Luminescence, Nyirenda, A.N. and Chithambo, M.L., 2017. Factors influencing the shape of CW-OSL signal obtained by stimulation of very deep traps in carbon-doped aluminium oxide: An experimental study. Journal of Luminescence, 192, pp.436-442., Journal of Luminescence volume 192 436 442 December 2017 0022-2313
- Rights
- Elsevier
- Rights
- Use of this resource is governed by the terms and conditions of the Science Direct Terms and Conditions Statement (https://www.elsevier.com/legal/elsevier-website-terms-and-conditions)
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Chithambo, Makaiko Liwiro (Prof)
RU Department of Physics and Electronics
SDG 09. Industry, Innovation and Infrastructure
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