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Number of results

Journal

2011 | 9 | 2 | 432-437

Article title

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

Content

Title variants

Languages of publication

EN

Abstracts

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.

Publisher

Journal

Year

Volume

9

Issue

2

Pages

432-437

Physical description

Dates

published
1 - 4 - 2011
online
20 - 2 - 2011

Contributors

  • Institute of Solid State Physics, University of Latvia, Kengaraga street 8, LV-1063, Riga, Latvia
author
  • Hamburger Synchrotronstrahlungslabor HASYLAB at Deutsches Elektronensynchrotron DESY, Notkestraße 85, Hamburg, 22607, Germany
author
  • 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
author
  • Institute of Solid State Physics, University of Latvia, Kengaraga street 8, LV-1063, Riga, Latvia

References

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Document Type

Publication order reference

Identifiers

YADDA identifier

bwmeta1.element.-psjd-doi-10_2478_s11534-010-0108-7
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