Electroreflectance studies on the excitons in PTS and DCHD single crystals

摘要: Abstract In polydiacetylene single crystals of PTS [poly-2,4-hexadiyne-1,6-diol-bis( p -toluene sulfonate)] and DCHD [poly-1,6-di(N-carbazolyl)-2, 4-hexadiyne] electric field modulated reflectance spectra in the range π-π* excitations polymer indicate considerable delocalization electrons along chain. Shape size excitonic electroreflectance are determined by a large charge transfer component excitons. Evaluation yields about 20% 40% with excitation to neighbouring π bonds DCHD, respectively. Large differences occur vibronic excitons pointing pronounced coupling carbazole side group At higher energy, −0.48 eV above lowest exciton transition both polymers signal is observed which attributed band transition.