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2011 | 9 | 2 | 432-437
Tytuł artykułu

Electronic excitations in ZnWO4 and ZnxNi1−x WO4 (x = 0.1 − 0.9) using VUV synchrotron radiation

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The photoluminescence spectra and luminescence excitation spectra of pure microcrystalline and nano-sized ZnWO4 as well as the ZnxNi1−x WO4 solid solutions were studied using vacuum ultraviolet (VUV) synchrotron radiation. The samples were also characterized by x-ray powder diffraction. We found that: (i) the shape of the photoluminescence band at 2.5 eV, being due to radiative electron transitions within the [WO6]6− anions, becomes modulated by the optical absorption of Ni2+ ions in the ZnxNi1−x WO4 solid solutions; and (ii) no significant change in the excitation spectra of Zn0.9Ni0.1WO4 is observed compared to pure ZnWO4. At the same time, a shift of the excitonic bands to smaller energies and a set of peaks, attributed to the one-electron transitions from the top of the valence band to quasi-localized states, were observed in the excitation spectrum of nano-sized ZnWO4.
Wydawca

Czasopismo
Rocznik
Tom
9
Numer
2
Strony
432-437
Opis fizyczny
Daty
wydano
2011-04-01
online
2011-02-20
Twórcy
  • Institute of Solid State Physics, University of Latvia, Kengaraga street 8, LV-1063, Riga, Latvia, akalin@latnet.lv
  • Hamburger Synchrotronstrahlungslabor HASYLAB at Deutsches Elektronensynchrotron DESY, Notkestraße 85, Hamburg, 22607, Germany
  • Institute of Solid State Physics, University of Latvia, Kengaraga street 8, LV-1063, Riga, Latvia, a.kuzmin@cfi.lu.lv
  • Institute of Solid State Physics, University of Latvia, Kengaraga street 8, LV-1063, Riga, Latvia
  • Institute of Solid State Physics, University of Latvia, Kengaraga street 8, LV-1063, Riga, Latvia
Bibliografia
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_s11534-010-0108-7
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