Preparation and luminescence of Ru(bpy)(2)(+)(3) doped TiO-SiOR hybrid films from different precursors

Ru(bpy)(3)(2+)-doped TiO2-SiOR (organic groups R = R-1 from GPTS or R-2 from MPTMS) hybrid films were prepared by the sol-gel method from different precursors 3-glycidoxypropyl-trimethoxysilane (GPTS) or 3-methacryloxypropyl-trimethoxysilane (MPTMS), methacrylic acid (MAA) and Ti(OBun)(4). Ti-O-Si and Si-O-Si bonds occurred via the sol-gel processing, -C-O-C- cycles and double bonds C=C were broken for photo-polymerization by UV-curing, in the hybrid films. Ti-O-Si could shift the absorption edge of the hybrid films to near 300nm. High transmittance of the TiO2-SiOR films could reach similar to 2500nm. When doped with Ru(bpy)(3)(2+), their photoluminescent spectra were measured under different excitation wavelengths and the emission peaks were occurred at -597 nm. The intensity of photoluminescence in the host TiO2-SiOR1 was much stronger than that in the host TiO2-SiOR2. The thermal decomposing temperature was T-d similar to 408 degrees C for the TiO2-SiOR1, and T-d similar to 411 degrees C for the TiO2-SiOR2.