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The large extent of the singlet exciton in poly(phenylene vinylene) (PPV) and the small Stokes shift suggest an effective-mass calculation for determining the exciton binding energy Eb. We have carried out such a calculation using the electron and hole masses determined by a local-density-functional band-structure calculation. The resulting Eb is 0.4 eV, which leads to a gap of {~}2.8 eV rather than the usually accepted 2.4 eV.
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Costa et al. (1993) studied this question.
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