Extrinsic carrier photogeneration in perylene pigment was studied by means of the electric field-induced fluorescence quenching. Perylene pigment mixed with small amount of phthalocyanine exhibited the effective enhancement of carrier generation efficiency together with decreasing field-induced fluorescence quenching, contrary to the expectation that both should be enlarged owing to the competitive relation between carrier generation and carrier recombination entailing fluorescence. The model assuming the existence of another efficient channel to photogenerate geminate ion pairs through perylene/phthalocyanine molecular contacts, solved this intriguing result reasonably.
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Hiramoto et al. (1994) studied this question.
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