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Luminescence of Organic Dyes in Silica Matrices

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The luminescence spectra of the acridine dyes adsorbed on the dispersed silica surface and introduced into the silica film composition at the sol-to-gel transition stage have been studied. The formation of protonated forms of adsorbed dyes, the appearance of the anomalously long-time recombination afterglow, and the photoradicalization of dye at low temperature have been found. The effect of the transition metal dopant ions of Fe and Mn in a SiO2 matrix on dye luminescence quenching has been investigated. The luminescence quenching due to the transition metal ions is explained on the basis of an exchange-resonant interaction with contribution of the chemical interaction - complex formation.

Affiliations: 1: Institute of Surface Chemistry, Academy of Sciences of the Ukraine, Kiev, 252028


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