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The effects of weak magnetic fields on the photoconductivity of poly (p-phenylene vinylene) (PPV) and two derivatives, poly (1, 4-phenylene-1, 2-dimethoxyphenyl vinylene) (DMOP-PPV) and poly (2-phenyl-1, 4-phenylene vinylene) (PPPV), were observed within the temperature range 130--350 K. These effects are attributed to the formation of interchain pairs involving a negative polaron and a positive polaron. A polaron pair is formed as a result of interchain electron transfer from a molecular exciton. The lifetime of a pair is estimated to be within the range of 10^-8--10^-9 s. Thermal dissociation of a polaron pair produces free charge carriers, and recombination of the pair regenerates a singlet or triplet exciton on a single conjugated segment of a chain.
Frankevich et al. (1992) studied this question.
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