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X-ray absorption study of rare earth ions in Sr2MgSi2O7:Eu2+,R3+ persistent luminescence materials

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Author

  • Stefan Carlson
  • Jorma Holsa
  • Taneli Laamanen
  • Mika Lastusaari
  • Marja Malkamaki
  • Janne Niittykoski
  • Riikka Valtonen

Summary, in English

The valence of the europium dopant and selected rare earth co-dopants (Ce3+, Dy3+, and Yb3+) in the Sr2MgSi2O7:Eu2+,R3+ persistent luminescence materials were studied by room temperature XANES measurements. The results indicated the co-existence of both divalent and trivalent europium in all the studied materials. The relative amount of Eu3+ was observed to increase upon increasing exposure to X-rays, as expected by the persistent luminescence mechanism. This suggests a simultaneous filling of oxygen vacancies initially created by the reducing preparation conditions. For the Dy and Yb co-dopants, only trivalent species were observed. On the other hand, traces of tetravalent cerium were present in the Eu,Ce co-doped materials. (c) 2009 Elsevier B.V. All rights reserved.

Department/s

Publishing year

2009

Language

English

Pages

1877-1879

Publication/Series

Optical Materials

Volume

31

Issue

12

Document type

Journal article

Publisher

Elsevier

Topic

  • Natural Sciences
  • Physical Sciences

Keywords

  • Dysprosium
  • Cerium
  • Europium
  • Persistent luminescence
  • XANES
  • Ytterbium

Status

Published

ISBN/ISSN/Other

  • ISSN: 0925-3467