Optical transitions in pairs of trivalent ion-interstitial fluorine in alkaline-earth fluorides

✍ Scribed by Radzhabov, E. ;Nepomnyashchikh, A. ;Kirm, M.

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 292 KB
• Volume: 204
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200673725

✦ Synopsis

Abstract

Absorption, excitation in vacuum ultraviolet region, emission and decay of emission of alkaline‐earth crystals (CaF~2~, SrF~2~, BaF~2~) doped by different concentrations of YF~3~ or LaF~3~ were studied. New emission bands in the region 3–6 eV and excitation bands just below exciton edges were observed. Unempirical Hartree–Fock and density functional calculations of alkaline‐earth crystal clusters containing Y or La impurity were performed. We concluded that observed optical bands belong to transitions between interstitial fluorine and trivalent metal parts of pairs Me^3+^–F^–^~i~. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)