Инд. авторы:	Pustovarov V.A., Ogorodnikov I.N., Isaenko L.I., Lobanov S.I., Goloshumova A.A, Naumov D.Y.
Заглавие:	A luminescence spectroscopy study of new Li2BaAl2F10 single crystal
Библ. ссылка:	Pustovarov V.A., Ogorodnikov I.N., Isaenko L.I., Lobanov S.I., Goloshumova A.A, Naumov D.Y. A luminescence spectroscopy study of new Li2BaAl2F10 single crystal // Optical Materials. - 2018. - Vol.76. - P.1-10. - ISSN 0925-3467. - EISSN 1873-1252.
Внешние системы:	DOI: 10.1016/j.optmat.2017.12.017; РИНЦ: 35478047; SCOPUS: 2-s2.0-85037695043; WoS: 000425560700001;
Реферат:	eng: Large Li2BaAl2F10 single crystals of optical quality were grown using the vertical Bridgman method. X-ray diffraction method was used to determine the crystal structure (orthorhombic symmetry Cmc2(1)), lattice parameters, atomic coordinates. The luminescent properties were investigated using selective photo excitation by synchrotron radiation (E = 3.7-21 eV, T = 8 K, time integrated and time-resolved spectra) as well as upon excitation with unfiltered X-ray beam (synchrotron radiation or X-ray tube). We revealed both the broadband luminescence at E (m) = 4.0 eV (E (ex)=11.72 eV) attributed to the radiative annihilation of self-trapped excitons (STE) and the excitonic-type near-defect luminescence at E (m) = 3.0-3.2 eV (E (ex)=11.25 eV) attributed to radiative relaxation of electronic excitations in nonequivalent structural units of the crystal lattice. The fast exponential component with lifetime of 5.6 ns, a low-intensity intermediate component with a lifetime of 75-100 ns, a constant level - pedestal (sum of the micro- and millisecond decay components) were revealed in luminescence decay kinetics. The electronic structure parameters (bandgap E (g) = 13.0 eV, low-energy onset of the intrinsic host absorption E (c) = 11.2 eV), the energy threshold for the excitation of STE-luminescence (E t(h) = 11.2 eV) are determined from spectroscopic data. Thermoluminescence cm has been studied (90-350 K) using spectral-integral regime. Four partially overlapping TL glow peaks were revealed, their deconvolution was done and thermal activation parameters were determined using TGCD method. (C) 2017 Elsevier B.V. All rights reserved.
Ключевые слова:	CENTERS; LISRALF6; LICAALF6; RELAXATION; ULTRAVIOLET; EXCITATIONS; VUV SPECTROSCOPY; SELF-TRAPPED EXCITONS; Thermoluminescence; Luminescence spectra; Electronic structure parameters; Crystallographic structure; Vertical Bridgman method; Decafluoride Li2BaAl2F10; SYNCHROTRON-RADIATION; PURE;
Издано:	2018
Физ. характеристика:	с.1-10
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