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

Författare:
  • Stefan Carlson (PhD)
  • Jorma Holsa
  • Taneli Laamanen
  • Mika Lastusaari
  • Marja Malkamaki
  • Janne Niittykoski
  • Riikka Valtonen
Publiceringsår: 2009
Språk: Engelska
Sidor: 1877-1879
Publikation/Tidskrift/Serie: Optical Materials
Volym: 31
Nummer: 12
Dokumenttyp: Artikel
Förlag: Elsevier Science BV

Sammanfattning

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.

Disputation

Nyckelord

  • Physics and Astronomy
  • Dysprosium
  • Cerium
  • Europium
  • Persistent luminescence
  • XANES
  • Ytterbium

Övriga

Published
Yes
  • ISSN: 0925-3467

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