RhB／SiO2凝胶的吸收与发射光谱

将有机染料若丹明B（RhB)以溶胶－凝胶方法镶嵌于SiO2凝胶载体中，测量了样品的吸收光谱和发光光谱。发现，以凝胶玻璃作载体，染料的集聚程度降低，发光光谱发生红移，认为，与凝胶介孔的弱极性环境和激发态分子的偶极矩的减小有关。

Absoption and Photoluminescence Spectra of RhB/SiO2 Gel

Phodamine B(RhB) was embedded in a matrix of silica gel glass by the sol gel method.Absorption and photoluminescence spectra were obtained.We found that the degree of aggregation decreases for the SiO 2 may be regarded as a hydroxylic,relatively polar environment,less polar than water although controversy still exists on the role of water in causing aggregation.Photoluminescence red shift was observed which may be interpreted as reflecting a decrease in the dipole moment of the exited molecule.