Al_2O_3对稀土配合物掺杂有机改性凝胶玻璃结构及荧光性能的影响

Effect of Al_2O_3 on Structure and Photoluminescence Property of Rare Earth Complex Doped Ormosil Gel Glass

以γ-缩水甘油氧基三甲氧基硅烷作为有机改性先驱体,采用原位合成技术,用溶胶-凝胶法制备稀土离子(Eu3+或Tb3+)、配位体β-二酮噻吩甲酰三氟丙酮或苯甲酸及协同体1,10-菲啰啉共掺的两种有机改性二氧化硅玻璃,测量它们的发射光谱和红外光谱,并进行X射线衍射分析和扫描电镜观察,探讨Al2O3的掺量对凝胶玻璃结构及性能的影响。结果表明:Al3+对稀土离子发射峰的位置没有明显的影响,并使凝胶在室温时的荧光减弱,但它能使稀土离子及原位合成的配合物在较高温度保持相对稳定,提高凝胶玻璃的热稳定性和荧光强度;在制备较实用的具有较强荧光的含稀土离子的凝胶玻璃时,要根据实际需要选取适宜掺量的Al2O3。

By using 3-glycidoxypropyltrimethoxysilane （GPTMS） as organic modified precursors,two types of organic modified silicate glasses co-doped with Eu^3＋ or Tb^3＋ ions, ligand β-diketone thenoyltrifluoroacetone or benzoic acid and synergic agent 1,10-phenanthroline were prepared via in situ sol-gel method,different contents of Al2O3 were also added into the gel simultaneously. The photoluminescence and infrared absorption （IR） spectra, XRD, and SEM measurements were performed. The effect of different Al2O3 contents on the structure and photoluminescence properties of rare earth organic complex in silica glass were investigated. The results indicated that Al3^＋ ions did not change the emission peaks of rare earths ,and the photoluminescence of the gel became weaker,but the rare earths and the corresponding in situ synthesized complexes could keep stable at a rela- tively higher temperature, the thermal and photoluminescence properties of the gel could be improved with appropriate content of AhOy. To manufacture the high photoluminescence silica gel glasses containing rare earth ions in the future, the appropriate A1203 content should be chosen accord- ing to the requirement.