Abstract
The sol-gel process is a chemical route that allows one to prepare amorphous and transparent oxide matrices doped with organic dyes. Luminescence of pyranine-doped aluminosilicate gels was studied during gel formation. The pyranine molecules adsorb on the surface of the oxide particles formed early in the gelation process. The changes in luminescence indicate a strong decrease in the hydrophilic character of the particles during gelation and aging. Absorption studies of rhodamine B- and 6G-doped silica gels show that the initial pH of the gels has a significant effect on the chemistry of the dye. Results suggest that both rhodamine B and 6G are influenced by the electrical charge developed on the silica gel surface.
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