Abstract
Composite organic/inorganic sol–gel matrices have been made with tetramethoxysilane and poly(ethylene glycol)-200, incorporating Eu 3+ ions. Polyethylene oxide oligomers match well with silica giving solid transparent gels. Europium ions are associated with the organic phase and they are protected from quenching mechanisms usually present in silica matrices. Thus, emission intensity and decay time increased and spectral bandwidth decreased in the presence of the oligomer. Increase of the decay time was also obtained with organic cationic dyes in the presence of the oligomer.
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