Interaction between host matrices and fluorescent species trapped in metal alkoxides derived gels

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Abstract
The sol-gel method has been identified as a very promising direction to prepare host matrices for trapping photoactive species. A wide variety of such activator are sensitive to environmental parameters and have been used both for sot-gel processing investigation and photoactive materials preparation. Depending on the organic or inorganic nature of the fluorescence probe, different fluorescence effects have to be expected in metal oxide matrix derived from a sol-gel process. Special attention has been given to the interaction between three fluorescent species (Eu3+ , Nd3+, pyrene) and three inorganic matrices (silica, titania, zirconia). Fluorescence phenomena have been investigated related to the nature of the probe and its incorporation mode into the host matrix.

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