Please use this identifier to cite or link to this item:
|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.
|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.|
SEMICONDUCTOR QUANTUM WELLS
SELF TRAPPED EXCITONS
|Appears in Collections:||Научные публикации, проиндексированные в SCOPUS и WoS CC|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.