Reduction Properties of Rare Earth in Soda-Borosilicate Glasses.

抄録

Glasses containing divalent rare earth ions have attracted much attention as broad band light emitting devices. In this study, the dependence of ionic valence of rare earth and emission spectra upon host glass composition was studied. Soda borosilicate glasses with various compositions containing 1 mol % of Sm ³⁺ were prepared in a reductive atmosphere to reduce Sm³⁺ ions. For the glass preparation, a multi-sample glass-formation tester was adopted. This apparatus is capable of handling 24 samples at once. The existence of thermally reduced Sm²⁺ was confirmed by their fluorescent emission spectrum. By using compositional combinatorial approach, the glass-forming region and the optimal region for reducing Sm³⁺ ions were determined in a ternary compositional diagram of soda borosilicate system. It was found that both regions overlapped each other and located near B₂O₃-rich side of the diagram.