Electrical conductivity, ESR spectra, optical absorption spectra of poly(p-phenylene vinylene) (PPV) and their dependence on doping are discussed in detail. The band gap of PPV was evaluated to be 2.7 eV, intermediate between those of polyacetylene and poly(p-phenylene). The evolution of localized states is evidenced by the spectral change with electrochemical doping. The results are interpreted in terms of the polaron and bi-polaron models.
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Yoshino et al. (1986) studied this question.
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