Optical properties of Rh6G molecules ordering in the silica- and titanium dioxide mesoscopic sol-gel films

The sol-gel method has been employed for the fabrication high quality mesostructured hybrid films. The effect of the nature of the matrix on the absorption and fluorescence spectra was found. It was shown that the aggregation of the dye molecules is significantly weaker in the SiO₂-P123/Rh6G based hybrid films. In case of TiO₂-P123/Rh6G films, the loss of isosbestic points in the absorption spectra in a TiO₂ matrix suggests the formation of higher aggregates and spectra concern mostly the red shift of the fluorescence maximum. Optical properties and exited state dynamic of Rh6G make the film a good candidate for producing photonic materials.