Fluorescence Properties of Silicate Glasses Doped with Tb³⁺ and Ce³⁺

抄録

Fluorescence spectra have been measured for rare-earth-doped silicate glasses in the SiO₂-CaO-Na₂O system. In particular, an attention has been paid to the fluorescence in silicate glasses doped with Tb³⁺ and Ce³⁺ under UV excitation. The excitation at 365nm carried out for glasses doped with both Tb³⁺ and Ce³⁺ gives rise to the emission ascribed to the ⁵D₄-⁷F₅ transition of Tb³⁺, although the glasses doped with only Tb³⁺ do not exhibit the emission when they are irradiated with UV at 365nm. It is ascertained that Ce³⁺ in the silicate glasses manifests absorption at 365nm. Hence, it is speculated that the energy transfer from Ce³⁺ to Tb³⁺ takes place in the silicate glasses doped with both Tb³⁺ and Ce³⁺.