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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