ELECTRIC-FIELD-INDUCED LUMINESCENCE QUENCHING IN CONJUGATED POLYMERS AND IN MOLECULARLY DOPED POLYMERS

In conjugated polymer blends as well as in molecularly doped polymer s ystems the photoluminescence intensity decreases under application of an electric field. This effect is described using a theory that combin es the migration of excitons with the dissociation of excitons into fr ee charge carriers. Experimentally, clear differences between both sys tems have been observed when varying the concentration of the active m aterial. The theory demonstrates that these differences are due to an intramolecular dissociation mechanism in the conjugated polymer system s and an intermolecular dissociation mechanism in the molecularly dope d polymer systems.