Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102342
Title: Photoluminescence of monoclinic Li3AlF6 crystals under vacuum ultraviolet and soft X-ray excitations
Authors: Pustovarov, V. A.
Ogorodnikov, I. N.
Omelkov, S. I.
Molokeev, M. S.
Kozlov, A. V.
Isaenko, L. I.
Issue Date: 2015
Publisher: Elsevier B.V.
Citation: Photoluminescence of monoclinic Li3AlF6 crystals under vacuum ultraviolet and soft X-ray excitations / V. A. Pustovarov, I. N. Ogorodnikov, S. I. Omelkov, et al. — DOI 10.1016/j.optmat.2015.09.011 // Optical Materials. — 2015. — Vol. 49. — P. 201-207.
Abstract: Using Bridgman technique we have grown monoclinic β-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 Eg≈12.5 eV, energy threshold for creation of unrelaxed excitons 11.8eV<En<12.5eV. 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 (Eex>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. © 2015 Elsevier B.V. All rights reserved.
Keywords: DEFECTS
LI3ALF6
TIME-RESOLVED LUMINESCENCE
VUV SPECTROSCOPY
DEFECTS
ELECTRONIC STRUCTURE
EXCITONS
PHOTOLUMINESCENCE
RIETVELD REFINEMENT
SEMICONDUCTOR QUANTUM WELLS
TEMPERATURE
X RAYS
BRIDGMAN TECHNIQUES
EXTREME ULTRAVIOLETS
INTER-BAND TRANSITION
LI3ALF6
RADIATIVE RECOMBINATION
SELF TRAPPED EXCITONS
TIME-RESOLVED LUMINESCENCE
VUV SPECTROSCOPY
CRYSTAL STRUCTURE
URI: http://hdl.handle.net/10995/102342
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 84944745567
PURE ID: 555878
d945703e-9101-418f-beb9-808696b3519d
ISSN: 9253467
DOI: 10.1016/j.optmat.2015.09.011
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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