Photoluminescence of anion-defective alumina single crystals exposed to high-dose gamma-radiation / Kortov V. S.,Pustovarov V. A.,Shtang T. V. // JOURNAL OF LUMINESCENCE. - 2016. - V. 169, l. A. - P. 24-28.

ISSN/EISSN:

0022-2313 / 1872-7883

Type:

Article

Abstract:

The method of UV and VUV spectroscopy with synchrotron radiation was used to measure photoluminescence (PL) spectra and photoluminescence excitation (PLE) spectra in anion-defective alumina single crystals exposed to high doses of gamma-radiation. A change in the intensity of the excitation band of F-centers near the fundamental absorption edge (8.8 eV) was found to depend on doses and temperatures. New wide bands with mu s-ms decay kinetics of emission were registered in the PL spectra at excitations with VUV and UV photons. The obtained results show that high-dose irradiations of the crystals under study lead to appearance of F-2-type aggregate centers in different charged states. These centers are additional traps of charge carriers. Emission bands of other aggregate and impurity centers, which form an experimental PL spectrum in the crystals exposed to high doses, were also identified. The evolution of the centers, produced by oxygen vacancies and impurities, creates the features of dose responses of dosimetric alpha-Al2O3:C single crystals exposed to high doses of radiations. (C) 2015 Elsevier B.V. All rights reserved.

Author keywords:

Alumina; Synchrotron radiation; VUV spectroscopy; Oxygen vacancies; Aggregated centers OPTICAL-PROPERTIES; AL2O3-C,MG CRYSTALS; LUMINESCENCE; THERMOLUMINESCENCE; CENTERS; IONS; IRRADIATION; ALPHA-AL2O3; DEPENDENCE; ABSORPTION

DOI:

10.1016/j.jlumin.2015.08.065

Web of Science ID:

ISI:000365604700004

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JAN
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
EISSN	1872-7883
Keywords-Plus	OPTICAL-PROPERTIES; AL2O3-C,MG CRYSTALS; LUMINESCENCE; THERMOLUMINESCENCE; CENTERS; IONS; IRRADIATION; ALPHA-AL2O3; DEPENDENCE; ABSORPTION
Research-Areas	Optics
Web-of-Science-Categories	Optics
Author-Email	vskortov@mail.ru
Funding-Acknowledgement	Ministry of Education and Science of Russian Federation; HASILAB DESY {[}20110050]
Funding-Text	This work has been done as a part of the governmental task (3.1016.2014/K) by the Ministry of Education and Science of Russian Federation and supported by HASILAB DESY (Project no. 20110050).
Number-of-Cited-References	28
Usage-Count-Since-2013	8
Journal-ISO	J. Lumines.
Doc-Delivery-Number	CX3NC