基质环境对氨基苯甲酸/硅凝胶复合材料荧光特性的影响

近年来，溶胶－凝胶技术在制备无机－有机复合材料中的应用越来越广泛犤１～６犦。该方法既可以制得具有很好机械性能和光学均匀性的块体材料，也可以制得薄膜和粉体材料。有机光学活性物质在无机基质中的存在状态及其化学环境，有机分子之间及有机分子与无机基质之间的相互作用对材料的热稳定性、光学特性以及实际应用影响极大犤７～１０犦。研究无机基质的微环境与有机光学活性分子之间的相互作用，对于复合材料的组成、性能、制备工艺的优化设计和实际应用至关重要。但是，目前有关这方面的系统研究报道很少。本文在硅溶胶中分别掺入了一…

Influence of Matrix Surroundings on the Fluorescence Properties of Amino-Benzoic Acid Doped Silica Gel Materials

Two kinds of organic-inorganic composite luminescent material were prepared through sol-gel route, by doping o-amino-benzoic acid (ABA) or N-phenylanthranilic acid (N-PA) into SiO₂ xerogels. Fluorescence properties and thermal properties of ABA and N-PA in SiO₂ xerogels were studied. The relationship between the fluorescence properties and the preparative condition was also studied. The results showed that the ABA was easy to form dimer of non-luminescence among the molecules. The quenching concentration of the ABA was obviously increased owing to the shield of silica network. The fluorescence intensity of the composite material prepared at the acid condition was decreased, and a red shift for the fluorescence peak appeared. With the increasing of the pH value, the flu-orescence peak blue shifted and the intensity was increased. However, the fluorescent intensity of N-PA/SiO₂ was increasing due to the concentration of N-PA was increased. The thermal stability of ABA and N-PA in the composite material was also improved. But, when the temperature continued to increase, the collapse of the silica network made the organic molecules escape from the pore of the silica network, the decomposition of escaping molecules decreased the intensity of emission spectrum.