Upconversion luminescence in Yb3+ sensitized Er3+/Yb3+-codoped tellurite glasses

作者：Dai Shi Xun^*; Li Xu Jie; Nie Qiu Hua; Xu Tie Feng; Shen Xiang; Wang Xtm Si

来源：Acta Physica Sinica, 2007, 56(9): 5518-5525.

• Er3+/Yb3+/Ho3+-codoped
• tellurite glasses
• optical properties
• upconversion

A series of Er3+/Yb3+ -codoped, Ho3+/Yb3+ -codoped, and Er3+/Yb3+/Ho3+ -triply doped tellurite glasses were prepared by high-temperature melting. Under 975 nm laser light excitation, intense green and red upconversion luminescence was observed in all the three kinds of codoped tellurite glasses. The influence of Yb3+ ions on the upconversion emission properties of Er3+ and Ho3+ ions was investigated as well as the energy transfer efficiencies of Yb3+ -> Er3+ and Yb3+ -> Ho3+. Upconversion luminescence mechanisms of Er3+ and Ho3+ sensitized by Yb3+ in tellurite glasses were discussed. When the concentrations of Er3+ and Ho3+ ions were fixed at low values, the intensity of green and red upcoversion emission in Er3+/Yb3+/Ho3+ triply doped tellurite glasses increases with increasing Yb2O3 content, which are due to the interaction overlap of Er3+: S-4(3/2) -> I-4(15/2) and Ho3+ :S-5(2)(F-5(4))-> I-5(8) transitions, Er3+: F-4(9/2) -> I-4(15/2) and Ho3+ :F-5(5) -> I-5(8) transitions, respectively. In Er3+/Yb3+/Ho3+ -triply doped tellurite glasses, the upconversion luminescence mechanisms were affected by the interaction energy transfers of Er3+/Yb3+, Ho3+/Yb3+ and Er3+/Ho3+. The cross-relaxation between Er3+ and Ho3+ enhances the upconversion emission intensities of Ho3+ in the visible region.

• 出版日期2007-9
• 单位宁波大学