Abstract
Exciplex fluorescence of poly(N-vinylcarbazole) film doped with dimethylterephthalate is quenched efficiently by applying an electric field. This is probably due to a field-assisted thermal dissociation of the exciplex into free carriers. The decrease in exciplex fluorescence shows a quadratic dependence on field strength. This result which shows an emission due to the exciton—doped molecule interaction, not only provides strong support for a mechanism of photocarrier generation via an exciplex in poly(N-vinylcarbazole) but may also provide an insight into the detailed processes in the currently accepted mechanism of extrinsic photocarrier generation in organic molecular crystals.
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