铕掺杂硅钛柱撑蒙脱土的合成及发光性能研究

Preparation and Spectrum Properties of Eu^(3+)-Doped Silicon-Titanium Pillared Montmorillonite

采用溶胶凝胶法制备了Eu3+掺杂的硅钛柱撑蒙脱土(Si-Ti-MT),运用XRD,SEM-EDX和FT-IR对其结构进行了表征。结果表明,Eu3+掺杂的硅钛柱撑剂插入蒙脱土层之间,保持了蒙脱土层状结构。经荧光发射光谱和激发光谱分析可知,Si-Ti-MT是Eu3+发光的有效基体,其发射能级主要为Eu3+613 nm(5D0→7F2);激发光谱中表现了Eu3+的5个特征激发带,分别为363 nm(7F0→5D4),382 nm(7F0→5G2),395 nm(7F0→5L6),415 nm(7F0→5D1)和465 nm(7F0→5D2);热处理促进了Eu3+掺杂的硅钛柱撑蒙脱土的发光,且样品的荧光强度随着Eu3+掺杂量的增加而增强,不会发生浓度猝灭现象。

The Eu^3 ＋ doped silicon-titanium pillared montmorillonite was prepared by the sol-gel method, and the structure was studied by XRD, SEM-EDX and FT-IR. The results indicated that the pillaring agent of Eu^3 ＋ doped silicon-titanium was inserted into the mont- morillonite, which did not destroy the framework of montmorillonite. The results of fluorescence emission spectroscopy and fluorescence excitation spectroscopy showed that the Si-Ti-MT was effective for the fluorescent properties of Eu^3 ＋. The 613 nm emission of Eu^3 ＋ （^5D0→^7F2） was the mainly emission transition. The characteristic excitation lines of Eu^3＋ typically were 363 nm（^F0→^5D4）, 382 nm （^7F0→^5C2）, 395 nm （^7F0→^5L6 ）, 415 nm （^7F0→^5D1 ）, and 465 nm （^7F0→^5D2）. The fluorescent properties of Eu^3＋ doped Si-Ti-MT could be promoted by heat treatment, fluorescence intensity could increase with the content of Eu^3 ＋ , and the concentration quenching phenomenon was not found.