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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
biochemistry, genetics and molecular biology
Thermal dependence of luminescence lifetimes and radioluminescence in quartz
Journal of Luminescence, Volume 145, Year 2014
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Description
During time-resolved optical stimulation experiments (TR-OSL), one uses short light pulses to separate the stimulation and emission of luminescence in time. Experimental TR-OSL results show that the luminescence lifetime in quartz of sedimentary origin is independent of annealing temperature below 500 C, but decreases monotonically thereafter. These results have been interpreted previously empirically on the basis of the existence of two separate luminescence centers LH and LL in quartz, each with its own distinct luminescence lifetime. Additional experimental evidence also supports the presence of a non-luminescent hole reservoir R, which plays a critical role in the predose effect in this material. This paper extends a recently published analytical model for thermal quenching in quartz, to include the two luminescence centers LH and LL, as well as the hole reservoir R. The new extended model involves localized electronic transitions between energy states within the two luminescence centers, and is described by a system of differential equations based on the Mott-Seitz mechanism of thermal quenching. It is shown that by using simplifying physical assumptions, one can obtain analytical solutions for the intensity of the light during a TR-OSL experiment carried out with previously annealed samples. These analytical expressions are found to be in good agreement with the numerical solutions of the equations. The results from the model are shown to be in quantitative agreement with published experimental data for commercially available quartz samples. Specifically the model describes the variation of the luminescence lifetimes with (a) annealing temperatures between room temperature and 900 C, and (b) with stimulation temperatures between 20 and 200 C. This paper also reports new radioluminescence (RL) measurements carried out using the same commercially available quartz samples. Gaussian deconvolution of the RL emission spectra was carried out using a total of seven emission bands between 1.5 and 4.5 eV, and the behavior of these bands was examined as a function of the annealing temperature. An emission band at ∼3.44 eV (360 nm) was found to be strongly enhanced when the annealing temperature was increased to 500 C, and this band underwent a significant reduction in intensity with further increase in temperature. Furthermore, a new emission band at ∼3.73 eV (330 nm) became apparent for annealing temperatures in the range 600-700 C. These new experimental results are discussed within the context of the model presented in this paper. © 2013 Elsevier B.V.
Authors & Co-Authors
Pagonis, V.
United States, Westminster
Mcdaniel College
Chithambo, Makaiko L.
South Africa, Grahamstown
Rhodes University
Chen, R.
Israel, Tel Aviv-yafo
Tel Aviv University
Chruścińska, A.
Poland, Torun
Uniwersytet Mikołaja Kopernika w Toruniu
Fasoli, M.
Italy, Milan
Università Degli Studi Di Milano-bicocca
Li, Sheng Hua
Hong Kong, Hong Kong
The University of Hong Kong
Martini, M.
Italy, Milan
Università Degli Studi Di Milano-bicocca
Ramseyer, K.
Switzerland, Bern
Institut Für Geologie
Statistics
Citations: 32
Authors: 8
Affiliations: 7
Identifiers
Doi:
10.1016/j.jlumin.2013.07.022
ISSN:
00222313
Research Areas
Environmental
Study Approach
Quantitative