Photoluminescence of monoclinic li<sub>3</sub>alf<sub>6</sub> crystals under vacuum ultraviolet and soft x-ray excitations

Pustovarov V.A.; Ogorodnikov I.N.; Kozlov A.V.; Omelkov S.I.; Molokeev M.S.; Isaenko L.I.

doi:10.1016/j.optmat.2015.09.011

Инд. авторы:	Pustovarov V.A., Ogorodnikov I.N., Kozlov A.V., Omelkov S.I., Molokeev M.S., Isaenko L.I.
Заглавие:	Photoluminescence of monoclinic li₃alf₆ crystals under vacuum ultraviolet and soft x-ray excitations
Библ. ссылка:	Pustovarov V.A., Ogorodnikov I.N., Kozlov A.V., Omelkov S.I., Molokeev M.S., Isaenko L.I. Photoluminescence of monoclinic li₃alf₆ crystals under vacuum ultraviolet and soft x-ray excitations // Optical Materials. - 2015. - Vol.49. - P.201-207. - ISSN 0925-3467. - EISSN 1873-1252.
Внешние системы:	DOI: 10.1016/j.optmat.2015.09.011; РИНЦ: 24962935; SCOPUS: 2-s2.0-84944745567; WoS: 000364255100032;
Реферат:	eng: 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.
Ключевые слова:	Vacuum ultraviolets; Time-resolved luminescence; Self trapped excitons; Radiative recombination; Inter-band transition; Extreme ultraviolets; Bridgman techniques; Temperature; Semiconductor quantum wells; Crystal structure; Photoluminescence; Luminescence; Excitons; Electronic structure; Defects; VUV spectroscopy; Time-resolved luminescence; Li3AlF6; Defects; Rietveld refinement; VUV spectroscopy;
Издано:	2015
Физ. характеристика:	с.201-207