Photoluminescence of monoclinic Li3AlF6 crystals under vacuum ultraviolet and soft X-ray excitations / Pustovarov V. A.,Ogorodnikov I. N.,Omelkov S. I.,Molokeev M. S.,Kozlov A. V.,Isaenko L. I. // OPTICAL MATERIALS. - 2015. - V. 49, l. . - P. 201-207.

ISSN/EISSN:

0925-3467 / 1873-1252

Type:

Article

Abstract:

Using Bridgman technique we have grown monoclinic beta-LiAF crystals suitable for optical studies, performed XRD-identification and Rietveld refinement of the crystal structure and carried out a photoluminescence study upon vacuum ultraviolet (VUV) and extreme ultraviolet (XUV)-excitations, using the low-temperature (T = 7.2 K) time-resolved VUV-spectroscopy technique. The intrinsic PL emission band at 340-350 nm has been identified as due to radiative recombination of self-trapped excitons. The electronic structure parameters were determined: bandgap E-g approximate to 12.5 eV, energy threshold for creation of unrelaxed excitons 11.8 eV < E-n < 12.5 eV. The PL emission bands at 320-325 and 450 nm were attributed to luminescence caused by lattice defects. We have discovered an efficient excitation of PL emission bands in the energy range of interband transitions (E-ex > 13.5 eV), as well as in the energy range of core transitions at 130 eV. We have revealed UV-VUV PL emission bands at 170 and 208 nm due to defects. A reasonable assumptions about the origin of the UV-VUV bands were discussed. (C) 2015 Elsevier B.V. All rights reserved.

Author keywords:

Li3AlF6; Time-resolved luminescence; VUV spectroscopy; Defects LIBAALF6 SINGLE-CRYSTALS; F-TYPE CENTERS; LIBAF3 CRYSTALS; COLOR-CENTERS; RECOMBINATION LUMINESCENCE; RIETVELD REFINEMENT; VUV SPECTROSCOPY; TRAPPED EXCITONS; ENERGY-TRANSFER; PURE

DOI:

10.1016/j.optmat.2015.09.011

Web of Science ID:

ISI:000364255100032

Соавторы в МНС:

Другие поля

Поле	Значение
Month	NOV
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
EISSN	1873-1252
Keywords-Plus	LIBAALF6 SINGLE-CRYSTALS; F-TYPE CENTERS; LIBAF3 CRYSTALS; COLOR-CENTERS; RECOMBINATION LUMINESCENCE; RIETVELD REFINEMENT; VUV SPECTROSCOPY; TRAPPED EXCITONS; ENERGY-TRANSFER; PURE
Research-Areas	Materials Science; Optics
Web-of-Science-Categories	Materials Science, Multidisciplinary; Optics
Author-Email	omelkovs@gmail.com
ResearcherID-Numbers	Molokeev, Maxim/D-1108-2013 Ogorodnikov, Igor/B-4162-2011 Isaenko, Ludmila/A-5272-2014
ORCID-Numbers	Molokeev, Maxim/0000-0002-8297-0945 Ogorodnikov, Igor/0000-0002-4700-2340
Funding-Acknowledgement	Ministry of Education and Science of the Russian Federation; Center of Excellence ``Radiation and Nuclear Technologies{''} (Competitiveness Enhancement Program of Ural Federal University, Russia); HASYLAB DESY {[}20110843, 20080119EC]; European Social Fund ({''}Mobilitas{''} program) {[}MJD219]; Estonian Research Council {[}IUT02-26]; Baltic Science Link project - Swedish Research Council, VR
Funding-Text	This work was partly supported by the Ministry of Education and Science of the Russian Federation (the basic part of the government mandate); Center of Excellence ``Radiation and Nuclear Technologies{''} (Competitiveness Enhancement Program of Ural Federal University, Russia), HASYLAB DESY (Projects Nos. 20110843, 20080119EC), European Social Fund ({''}Mobilitas{''} program, MJD219), Estonian Research Council (Institutional Research Funding IUT02-26) and Baltic Science Link project coordinated by the Swedish Research Council, VR.
Number-of-Cited-References	49
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	15
Journal-ISO	Opt. Mater.
Doc-Delivery-Number	CV4RV