Time-resolved luminescence spectroscopy of structurally disordered K3WO3F3 crystals / Omelkov S. I.,Spassky D. A.,Pustovarov V. A.,Kozlov A. V.,Isaenko L. I. // OPTICAL MATERIALS. - 2016. - V. 58, l. . - P. 285-289.

ISSN/EISSN:

0925-3467 / 1873-1252

Type:

Article

Abstract:

Three emission centers of exciton-like origin, with distinct relaxation time, emission and excitation spectra were revealed in K3WO3F3 and described taking into account its structural disordering. Low temperature monoclinic phase of K3WO3F3 features few anion sites with mixed oxygen/fluorine occupancy per {[}WO3F3] octahedron. Therefore, different kinds of distorted octahedra form, providing different luminescence centers. The time-resolved luminescence spectroscopy technique was applied to distinguish these centers. The simultaneous thermal quenching of them above similar to 200 K was qualitatively explained involving dynamic structural disorder of the compound. The energy transfer mechanism between centers was found and tentatively described by the diffusion of excitons. Apart from intrinsic luminescence, the PL of defect-related centers was discovered and the role of shallow charge carrier traps in the low-temperature persistent luminescence was revealed. (C) 2016 Elsevier B.V. All rights reserved.

Author keywords:

Potassium fluorotungstate; Oxyfluorides; Time-resolved luminescence; Intrinsic luminescence PHASE-TRANSITIONS; OXYFLUORIDE; TEMPERATURE; TRANSFORMATIONS; ELPASOLITE

DOI:

10.1016/j.optmat.2016.05.032

Web of Science ID:

ISI:000381593900043

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	AUG
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
EISSN	1873-1252
Keywords-Plus	PHASE-TRANSITIONS; OXYFLUORIDE; TEMPERATURE; TRANSFORMATIONS; ELPASOLITE
Research-Areas	Materials Science; Optics
Web-of-Science-Categories	Materials Science, Multidisciplinary; Optics
Author-Email	omelkovs@gmail.com
ResearcherID-Numbers	Isaenko, Ludmila/A-5272-2014 Spassky, Dmitry/D-9524-2012
Funding-Acknowledgement	Estonian Ministry of Education and Research {[}IUT2-26]; European Social Fund ({''}Mobilitas programme{''}) {[}MJD219, MTT83]; 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)
Funding-Text	This work has been partly supported by Estonian Ministry of Education and Research (project IUT2-26), European Social Fund ({''}Mobilitas programme{''
Number-of-Cited-References	9
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	9
Journal-ISO	Opt. Mater.
Doc-Delivery-Number	DT6KU