Abstract
Recent quantum chemical calculations and measurements of the singlet-triplet splitting inferred from phosphorescence spectra reinforce the notion that the dominant electronic excitations in π-conjugated polymers are excitons which can undergo bimolecular interactions. Their dissociation into electron-hole pairs requires an energy of about 0.5 eV as evidenced by (i) the action spectrum for delayed fluorescence in a poly-chinoxalin due to geminate pair recombination and (ii) electric field quenching studies of delayed fluorescence in a PPV-derivative. Recent experimental and theoretical photoconductive studies are in accordance with the exciton concept.
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