Alteration of the optical properties of poly 9,9′-dioctylfluorene by TiO2 nanocrystalline

A poly 9,9′-dioctylfluorene (PFO)/TiO2 composite was successfully prepared by adsorbing the polymer on the surface of a TiO2 nanocrystalline film. The photoluminescence (PL) spectrum of the obtained nanocomposite film showed 28 nm of red-shift, compared to that of the bulk polymer film. The maximum of the PL emission peaks of the pure bulk polymer occurred at 442 nm, while the maximal emission for the nanocomposite film appeared at 470 nm. The interaction between the conjugated polymer chains and the nanopores of the TiO2 film played a key role in the resulting red-shift.