Luminescence of pure and iodine doped PPV: internal energetic structure revealed through spectral signatures

Stationary and time-resolved luminescent characteristics were investigated in a large number of poly(p-phenylene vinylene) (PPV) samples including as-grown films on different substrates, those subjected to thermal curing and vapor-phase iodine doping. The thermal treatment changes the intensity and characteristic time of photoluminescence in different manner for different luminescence lines. The iodine doping causes an additional luminescence peak at the photon energy 2.61 eV with simultaneous suppression of the basic emission band. Photoluminescence also depend on the energy of excitation quanta ℏωex, and for ℏωex=4.12 eV, becomes sensitive to the incidence angle of exciting light. The established correlations between technological parameters and emission spectra can be used for controlled modification of the latter.