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

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.

• Författare: Stefan Carlson; Jorma Holsa; Taneli Laamanen; Mika Lastusaari; Marja Malkamaki; Janne Niittykoski; Riikka Valtonen
• Avdelning/ar: MAX IV-laboratoriet
• Publiceringsår: 2009
• Språk: Engelska
• Sidor: 1877-1879
• Publikation/Tidskrift/Serie: Optical Materials
• Volym: 31
• Issue: 12
• Länkar: http://dx.doi.org/10.1016/j.optmat.2008.12.020
• Dokumenttyp: Artikel i tidskrift
• Förlag: Elsevier
• Ämne: Natural Sciences; Physical Sciences
• Nyckelord: Dysprosium; Cerium; Europium; Persistent luminescence; XANES; Ytterbium
• Status: Published
• ISBN/ISSN/Övrigt: ISSN: 0925-3467