Exciton mechanism of energy transfer to F-centers in dosimetric corundum crystals / Surdo AI,Kortov VS // RADIATION MEASUREMENTS. - 2004. - V. 38, l. 4-6, SI. - P. 667-671.

ISSN/EISSN:

1350-4487 / нет данных

Type:

Article; Proceedings Paper

Abstract:

The optical absorption (OA) and thermoluminescence of oriented alpha-Al2O3 crystals colored in aluminum vapor have been studied. Optical absorption measurements of an X-irradiated sample at the orientation E perpendicular to C-3 during isochronal annealing revealed mutual transformations of F- and F+-centers within the dosimetric peak from 380 to 500 K. The transformations occurred simultaneously with emptying of the electron trap whose OA is at 2.8 eV. The predominant F --> F+ conversion, which could be explained by delocalization of holes, was observed in the low-temperature part of the peak near 380-440 K. From the available experimental data it was inferred that the simultaneous release of electrons and holes in the low-temperature part of the peak facilitated formation of excitons bound on F-type centers. The excitons transferred part of the energy stored in the irradiated crystal to F+- and F--centers during thermal stimulation, leading to luminescence of these centers. (C) 2003 Elsevier Ltd. All rights reserved.

Author keywords:

absorption spectra; thermoluminescence; excitons OPTICAL-PROPERTIES; LUMINESCENCE; ALPHA-AL2O3; AL2O3

DOI:

10.1016/j.radmeas.2004.12.001

Web of Science ID:

ISI:000223807600074

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	AUG-DEC
Note	5th European Conference on Luminescent Detectors and Transformers of Ionising Radiation (LUMDETR 2003), Prague, CZECH REPUBLIC, SEP 01-05, 2003
Organization	Acad Sci Czech Republic, Inst Phys; Czech Tech Univ, Fac Nucl Sci \& Phys Engn
Publisher	PERGAMON-ELSEVIER SCIENCE LTD
Address	THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Language	English
Keywords-Plus	OPTICAL-PROPERTIES; LUMINESCENCE; ALPHA-AL2O3; AL2O3
Research-Areas	Nuclear Science \& Technology
Web-of-Science-Categories	Nuclear Science \& Technology
Author-Email	ais@dpt.ustu.ru
Number-of-Cited-References	10
Usage-Count-Since-2013	1
Journal-ISO	Radiat. Meas.
Doc-Delivery-Number	853DV