Luminescence properties of undoped LiBaAlF6 single crystals / Omelkov S. I.,Kirm M.,Feldbach E.,Pustovarov V. A.,Cholakh S. O.,Isaenko L. I. // JOURNAL OF PHYSICS-CONDENSED MATTER. - 2010. - V. 22, l. 29.

ISSN/EISSN:

0953-8984 / 1361-648X

Type:

Article

Abstract:

This paper presents the results of the study of electronic excitations in undoped LiBaAlF6 single crystals by means of luminescence spectroscopy and complimentary optical methods. The intrinsic emission at 4.2 eV due to self-trapped excitons was identified. The fast nanosecond defect-related luminescence was revealed at 3.0 eV. Both emissions degrade under electron beam irradiation, the most probable reason of which is defect creation introducing an additional non-radiative relaxation channel prohibiting energy transfer to luminescence centers. These defects can be recovered and luminescence intensity restored at higher temperatures (>200 K). The permanent damage by electron beam irradiation results only in overall growth of the absorption coefficient in the whole 1.5-6.5 eV spectral region studied. The analysis of thermally stimulated luminescence glow curves in the temperature range of 5-410 K revealed two shallow charge carrier traps with the activation energies of 0.22 and 0.33 eV, respectively. The luminescence of an impurity peaked at 2.5 eV was found and tentatively assigned to an oxygen-related emission center.

Author keywords:

INNER-SHELL EXCITATION; VUV SPECTROSCOPY; SYNCHROTRON-RADIATION; PURE; CE; LICAALF6; LIBAF3; FLUORIDES; EMISSION; LISRALF6

DOI:

10.1088/0953-8984/22/29/295504

Web of Science ID:

ISI:000279616000019

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JUL 28
Publisher	IOP PUBLISHING LTD
Address	TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
Language	English
Article-Number	295504
EISSN	1361-648X
Keywords-Plus	INNER-SHELL EXCITATION; VUV SPECTROSCOPY; SYNCHROTRON-RADIATION; PURE; CE; LICAALF6; LIBAF3; FLUORIDES; EMISSION; LISRALF6
Research-Areas	Physics
Web-of-Science-Categories	Physics, Condensed Matter
Author-Email	omelkovs@mail.ru
ResearcherID-Numbers	Isaenko, Ludmila/A-5272-2014 Kirm, Marco/M-1533-2016 Cholakh, Seif/M-8221-2016 Isaenko, Ludmila/H-7620-2013
ORCID-Numbers	Kirm, Marco/0000-0002-1833-6894 Cholakh, Seif/0000-0002-9313-6614
Funding-Acknowledgement	RFBR {[}07-02-00442, 09-02-00493]; Estonian Science Foundation {[}8306]; Archimedes Foundation (Estonia); European Commission {[}FP7/2007-2013, 226716]
Funding-Text	This work is partly supported by the RFBR (07-02-00442 and 09-02-00493) and the Estonian Science Foundation (grant no. 8306). SO acknowledges gratefully the Archimedes Foundation (Estonia) for a stipend supporting his stay at the University of Tartu during his PhD studies. Experimental studies carried out with the use of synchrotron radiation at HASYLAB were supported by the European Commission (FP7/2007-2013, grant 226716).
Number-of-Cited-References	30
Usage-Count-Since-2013	6
Journal-ISO	J. Phys.-Condes. Matter
Doc-Delivery-Number	621WI