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Eu3+离子作为荧光探针研究TiO2凝胶的结构变化

孟庆国; 张洪杰; 符连社; 杨魁跃   

  1. 中国科学院长春应用化学研究所稀土化学与物理开放实验室 长春 130022
  • 收稿日期:1998-09-11 修回日期:1998-10-19 出版日期:1999-08-20 网络出版日期:1999-08-20

Structural Changes of TiO2 Gel Using Eu3+ Ion as the Fluorescence Probe

MENG Qing-Guo, ZHANG Hong-Jie, FU Lian-She, YANG Kui-Yue   

  1. Laboratory of Rare Earth Chemistry and Physics; Changchun Institute of Applied Chemistry; Chinese Academy of Sciences Changchun 130022 China
  • Received:1998-09-11 Revised:1998-10-19 Published:1999-08-20 Online:1999-08-20

摘要: 利用 Eu 离子的 超灵敏跃迁对环境的极度敏感性, 将 Eu3 + 离子引入溶胶凝胶法制备的 Ti O 凝胶玻璃中, 并对 Eu 离子掺入后的光谱性质进行了研究, 从而表征了 Ti O 凝胶形成中的结构变化过程结果发现, 随处理温度的升高, 跃迁强度逐渐增强, 说明水分子的不断挥发、缩聚反应进行的不断完全; 同时将 Al3 + 离子掺入到溶胶中, 研究了其在 Eu3+ 离子的聚集所导致的荧光猝灭现象中所起的作用, 结果表明 Al3 + 离子的加入大大提高了 Eu3+ 离子的发光强度

关键词: 荧光探针, TiO2凝胶, 对称性

Abstract: Because of the extremely sensitivity to the local environment of the 5D07F2 transition of Eu3+ ion, the fluorescence
of Eu3+ ions was studied by introducing Eu3+ ions to TiO2 gel by the sol-gel method, from which the structural changes of TiO2 gel
were characterized. The results showed that the intensity of 5D07F2 transition increased with the increasement of heat treatment temperature,
which indicated the evaporation of molecular water and the completeness of the condensation reaction. Because of the quenching of the fluorescence
induced by the cluster of Eu3+ ions, the addition of Al3+ ions greatly enhanced the emission intensity of Eu3+ ion.

Key words: fluorescence probe, TiO2 gel, symmetry

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