Valence States and Luminescence Properties of Ytterbium Ions in Strontium Haloborates

✍ Scribed by V.P. Dotsenko; I.V. Berezovskaya; P.V. Pyrogenko; N.P. Efryushina; P.A. Rodnyi; C.W.E. van Eijk; A.V. Sidorenko

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 162 KB
• Volume: 166
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2002.9574

✦ Synopsis

The luminescence properties of ytterbium ions in strontium haloborates were studied under optical, X-ray and synchrotron excitation. The coexistence of Yb ions in two valence states (divalent and trivalent) was detected in the Sr 2 B 5 O 9 X : Yb (X ‫؍‬ Cl, Br) powder materials prepared in a slightly reducing (H 2 /N 2 ) or an oxidizing atmosphere. Under optical excitation, the 5dP4 f Yb 2؉ luminescence at 420 nm is observed. Even under X-ray excitation, an emission band with a maximum of about 340 nm appears in the spectra. This broadband emission is attributed to charge transfer luminescence of Yb 3؉ . The in6uence of the structural features of Sr 2 B 5 O 9 X and some preparative conditions of the samples on the luminescent behavior of Yb are discussed.

2002 Elsevier Science (USA)