Preparation and luminescence of silica aerogel composites containing an europium (III) phenanthroline nitrate complex

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• 作者：Stoyan Gutzov^a ; ^{sgutzov@chem.uni-sofia.bg} ; Nina Danchova^a ; Rada Kirilova^a ; Vesselin Petrov^a ; Stanislava Yordanova^b
• 关键词：Europium ; Silica aerogels ; Luminescence ; Composites
• 刊名：Journal of Luminescence
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：183
• 期：Complete
• 页码：108-112
• 全文大小：1108 K
• 卷排序：183

文摘

A simple two step procedure for the functionalization of hydrophobic silica aerogel microgranules with europium ions and/or 1,10 - phenanthroline is demonstrated. The activation procedure is based on soaking aerogels in a europium nitrate solution, followed by functionalization with 1,10 – phenanthroline. The functionalized materials display strong red or blue emission at UV-excitation, coming from the formation of [Eu(phen)2](NO3)3 or Si(IV)– 1,10-phenathroline complexes in the porous system of the aerogels. The most probable site symmetry of the europium cation is C2v confirmed by luminescence spectra analysis. Room temperature diffuse reflectance spectra and excitation/luminescence spectra are used to describe the optical properties of the hybrid composites. Excitation spectra prove an efficient energy transfer between 1,10 – phenanthroline and the Eu3+ ion.