1992 年 41 巻 464 号 p. 583-587
Fluorescence properties of Eu3+ ions doped in several oxide glasses were investigated using UV excitation and laser induced FLN (fluorescence line-narrowing) techniques. Inhomogenities of the sites of Eu3+ were evaluated from the width of the fluorescence peak of 5D0→7F0 transition, ΔνIH. Borate and germanate glasses in which the network forming ions can take two kinds of the coordination number depending on the amount of these ions, showed the ΔνIH values larger than those of silicate and borophosphate glasses. On the other hand, phosphate glasses composed of chain-like units showed the small ΔνIH value. Furthermore, the splitting of 5D0→7F1 transition peak was investigated by using FLN technique in order to compare the sites of Eu3+ 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 borophosphate glasses hardly changed. Such behaviors seem to be due to the compositional dependence of the condition of non-bridging oxygens which coordinate Eu3+ ions. From these results, it was concluded that the environments around the Eu3+ -sites in the silicate and borophosphate glasses are not influenced so much by the concentration of Na2O.