Abstract

The magnetic field effects on the carrier yield have been studied to clarify the spin dynamic process during photoinduced carrier generation in a fullerene (C 60)-doped poly( N-vinylcarbazole) (PVCz) film. The charge transfer (CT) complex of C 60 and the carbazole (Cz) chromophore is selectively excited. The total number of carriers that escaped from the geminate pairs decreases in the presence of magnetic fields, which arises from a hyperfine mechanism of the distant ion pairs involving C 60 - and Cz +. Time-resolved EPR measurements verify that the excited triplet state of C 60 is produced via its excited singlet state generated from the contact ion pair. The competitive formation processes of distant ion pairs and the excited states of C 60 from the contact ion pair are discussed.

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