Luminescence Spectroscopy of K3WO3F3 Oxyfluoride Crystals / Kozlov A. V.,Pustovarov V. A. // . - 2016. - V. 1767, l. .

ISSN/EISSN:

0094-243X / нет данных

Type:

Proceedings Paper

Abstract:

Spectra of photoluminescence (PL) in region of 1.5-5.5 eV, PL excitation spectra (3-22 eV), PL decay kinetics, the temperature dependence of the PL were measured for single crystals and ceramics K3WO3F3 as well as irradiate ceramics K3WO3F3. Synchrotron radiation was used for low temperature PL experiments with time resolution. Single crystals are transparent in microwave, visible and near UV range, inter-band transition energy is E-g = 4.3 eV. The intrinsic luminescence of tungstates is usually ascribed to the radiative relaxation of exciton-like excitations localized on WO6 octahedra or WO4 tetrahedra. In K3WO3F3 the wide band luminescence in the region of 2.5 eV with the Stokes shift of 1.5 eV with the microsecond decay kinetics is connected with luminescence of triplet self-trapped excitons (STE). This luminescence is formed by electronic transitions in {[}WO3F3] octahedron. Different distortion of KWOF crystal lattice is manifested in the change of the Stokes shift of STE luminescence band. The 3.2 eV emission band in low-temperature PL spectrum with decay times of 1.8 ns and 11 ns corresponds to singlet STE luminescence. A new 2.9 eV emission band is discovered in low-temperature PL spectrum in the samples irradiated by fast electrons (E = 10 MeV, D = 160 kGy). This emission band is excited not intracenter mechanism, and through the creation of excitons bound on the defects. It is suggested that it is F-like centers of anionic sublattice induced by the mechanism of elastic collision.

Author keywords:

нет данных

DOI:

10.1063/1.4962621

Web of Science ID:

ISI:000392693900037

Соавторы в МНС:

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Другие поля

Поле	Значение
Editor	Rempel, AA and Volkovich, VA
Booktitle	PHYSICS, TECHNOLOGIES AND INNOVATION (PTI-2016)
Series	AIP Conference Proceedings
Note	3rd International Young Researchers Conference - Physics, Technologies and Innovation (PTI), Ekaterinburg, RUSSIA, MAY 16-20, 2016
Organization	Ural Fed Univ, Inst Phys \& Technol
Publisher	AMER INST PHYSICS
Address	2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
Language	English
Article-Number	020037
ISBN	978-0-7354-1425-9
Research-Areas	Physics
Web-of-Science-Categories	Physics, Applied; Physics, Multidisciplinary
Author-Email	avkozlov@yahoo.com v.a.pustovarov@urfu.ru
Funding-Acknowledgement	Ministry of Education and Science of the Russian Federation (the basic part of the government mandate), Excellence Center on Radiation and Nuclear Technologies (Competitiveness Enhancement Program of Ural Federal University)
Funding-Text	Authors are grateful to Dr. L.I. Isaenko for the provided samples. This work has been supported by the Ministry of Education and Science of the Russian Federation (the basic part of the government mandate), Excellence Center on Radiation and Nuclear Technologies (Competitiveness Enhancement Program of Ural Federal University).
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