Abstract: Gd/Tb、Gd/Ce、Gd/Ce/Tb doped SiO₂-B₂O₃-BaF₂ fluorine oxide glass was prepared by high temperature melting method. The phase of fluorine oxide glass was determined by X-ray diffraction spectrum. The luminescence properties of Tb³⁺ doped with different Gd₂O₃ content were studied by the fluorescence spectra of Tb³⁺ under different excitation bands, and the more accurate numerical range of optimal Gd₂O₃content was determined. Gd/Ce/Tb co-doped fluorine oxide glass was prepared by changing the atmosphere. The sensitization of Gd³⁺ and Ce³⁺ to Tb³⁺ was studied. The results show that the prepared fluorine oxide glass has a stable glassy state. Both Gd³⁺ and Ce³⁺sensitize the luminescence of Tb³⁺, and the sensitization effect is most significant when Gd₂O₃ content is 7% (molar fration, the same below) compared with other content, and quenching occurs when Gd₂O₃ content exceeds 7%. Cerium can coexist in Ce³⁺ and Ce⁴⁺ valence states in Ce₂O₃ doped glass, and it is easier to maintain Ce³⁺ state when doped in reducing atmosphere than in air atmosphere. Moreover, Ce³⁺ sensitizes the luminescence of Tb³⁺, while Ce⁴⁺ inhibites the luminescence of Tb³⁺.

Key words: luminescence property of Tb³⁺, Gd/Ce/Tb-doping, valence state of Ce³⁺/Ce⁴⁺, fluorine oxide glass, energy transfer