Luminescence features of nanocomposites of silicon-organic polymer/porous SiO2 and TiO2 films

• Silicon polymer PDHS has been embedded into nanoporous SiO2 and TiO2 films.
• PDHS fluorescence is quenched several times in TiO2 film.
• Fluorescence intensity of the composite films weekly depends on temperature.

Photoluminescence properties of poly(di-n-hexylsilane) (PDHS) films as well as of PDHS adsorbed in nanoporous silica and titania films, and dispersed in films of silica nanoparticles have been investigated in a wide temperature range of 15–300 K. Photoluminescence spectra of all compounds were found to be dominated by the aggregate band. PDHS photoluminescence has been quenched by about 5 times in nanoporous titania film in comparison with the silica film. Weak temperature dependences of PDHS photoluminescence intensities, lifetimes, band positions, and bandwidths have been observed in nanoporous silica and titania films in comparison with neat PDHS film and PDHS dispersed in films of silica nanoparticles. It has been interpreted as a consequence of slow energy migration and weak photoluminescence quenching in nanoporous films.

Figure optionsDownload as PowerPoint slide