各種酸化物方ラス中にドープしたEu^<3+<の蛍光特性(<小特集>セラミック材料小特集号)

概要

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Fluorescence properties of Eu^<3+> ions doped in several oxide glasses were investigated using UV excitation and laser induced FLN (fluorescence line-narrowing) techniques. Inhomogenities of the sites of Eu^<3+> were evaluated from the width of the fluorescence peak of ^5D_0→ ^7F_0 transition, Δν_<IH>. Borate and germanate glasses in which the network forming ions can take two kinds of the coordination nunher depending on the amount of these ions, showed the Δν_<IH> Values larger than those of silicate and borophosphate glasses. On the other hand, phosphate glasses composed of chain-like units showed the small Δν_<IH> value. Furthermore, the splitting of ^5D_0→ ^7F_1 transition peak was investigated by using FLN technique in order to compare the sites of Eu^<3+> ions which were excited by the same laser energy. The widths of splitting in the borate, germanate and phosphate glasses varied with alkaline content, whereas those in silicate and borophoshate glasses hardly changed. Such behaviors seem to be due to the compositional dependence of the condition of non-bridging oxygens which coordinate Eu^<3+> ions. From these results, it was concluded that the environments around the Eu^<3+>-sites in the silicate and borophosphate glasses are not influenced so much by the concentration of Na_2O.
社団法人日本材料学会の論文
1992-05-15