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- Optical properties and photo-induced phenomena of polysilane-silica hybrid thin films prepared by a sol-gel method have been studied in terms of steady-state and time-resolved photoluminescence (PL). It is found that ultraviolet (UV) light-induced degradation of PL of the polysilane-silica hybrid thin films is suppressed in comparison with that of polymethylphenylsilane at 10 K, and that UV light exposure decreases the refractive index of the polysilane-silica hybrid thin film from 1.60 to 1.40 at room temperature. It is also found that with decreasing concentration of polysilane in the hybrid thin films, the relative quantum efficiency for PL, the degree of the PL linear polarization memory and the mean PL lifetime are increased. These results can be interpreted in terms of the confinement of excitation energy in polysilane chains because of the increase in the interchain separation. The information obtained here provides insights for optimizing nanostructured materials for use in optoelectronic devices.