Phototransferred thermoluminescence induced by 525 nm green light in α-Al2O3:C annealed at 1200oC

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2024-11-26 DOI:10.1016/j.jlumin.2024.121000

M.L. Chithambo, F.E.M. Elago

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Abstract

Phototransferred thermoluminescence (PTTL) induced by 525 nm green light in α-Al₂O₃:C annealed at 1200^oC has been studied. The annealing was done to alter the occupancy of electron traps and hole centres within the material. The conventional TL glow curve for measurements made at 1 ^oC/s shows three peaks at 54, 200, and 324^oC labeled PI, PII, and PIII. Whereas the first two peaks are reproduced under phototransfer, the third at 325^oC is not. Pulse annealing measurements imply that the PTTL observed at peak PI mainly originates from the electron trap of the dominant peak at 200^oC. On the other hand, peak PIII itself is affected by competition effects whereby its charge trap appears to act both as a donor and as an acceptor in competition with electron traps at which PTTL ensues. Measurement of the PTTL of peak II between preheating temperatures of 500 and 650^oC suggests that it can be linked, in part, to phototransfer from deep electron traps. PTTL time-response profiles have been formulated as systems of acceptor and donors.

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来源期刊

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.