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We have investigated the field-induced quenching of photoluminescence in a film of poly (p-phenylphenylenevinylene) (PPPV) blended with polycarbonate (PC). Upon applying a dc field 310^6 V cm^-1 a reduction of the luminescence yield up to 30% is observed. Time-resolved photoluminescence measurements using the fs-upconversion technique show that the quenching effect evolves on a time scale 0. 5 to 100 ps after excitation. We explain this ultrafast temporal behavior of the quenching process in terms of a field-assisted dissociation of neutral singlet excitations into geminate electron-hole pairs while undergoing a random walk among polymer segments. Our model implies that photocarrier generation is a secondary process resulting from exciton dissociation.
Архипов et al. (1995) studied this question.