Luminescence of Conjugated Molecules Confined in Nanochannels

The optical properties, molecular orientations and host-guest ratios of a series of p,p'-disubstituted oligophenylenevinylenes (OPVs), incorporated in the nanochannels of perhydrotriphenylene, are investigated by polarized fluorescence and UV absorption spectroscopy. The spectral positions and fine-structures of the fluorescence bands are very similar to those obtained in solution, thus indicating only weak interactions within the channels. In three-dimensional arrangements, the spectra are additionally red-shifted due to an increase of intermolecular interactions. Strongly red-shifted emission spectra due to intermolecular vibronic coupling are observed for films and single crystals of p,p'-dicyano-distyrylbenzene with π,π-stacking of the molecules.