| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5404149 | Journal of Luminescence | 2006 | 6 Pages |
Abstract
Ce3+/Na+-doped BaMgF4 (BMF) crystals with a nonlinear property show strong absorption in the vacuum ultraviolet (VUV) and ultraviolet (UV) ranges. Three different fluorescence bands (A, B, C) at 300, 340, and 430Â nm were observed when pumped at different wavelengths. Under excitation of the fourth harmonic (266Â nm) from a pulsed Nd:YAG laser the BMF crystal changed its colour from transparent to brown due to formation of colour centres. The A, B and C bands are assigned to three different sites of Ce3+: site A is Ce3+ substituting for perfect Ba2+ sites; site B is Ce3+ (Ba2+) perturbed by Na+ as a charge compensator; and site C is a complex composed of Ce3+ and Fâ vacancies, which trapped one or two electrons.
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Physical and Theoretical Chemistry
Authors
Eiji Hayashi, Kiyotaka Ito, Satoshi Yabashi, Mitsuo Yamaga, Nobuhiro Kodama, Singo Ono, Nobuhiko Sarukura,