A theory describing vibronic coupling in direct band gap, one-dimensional semiconductors is developed to account for the photophysical properties of isolated, defect-free conjugated polymers. A Holstein-like Hamiltonian represented in a multi-particle basis set is used to evaluate absorption and emission due to Wannier-Mott excitons. The photophysical properties of such quantum wires are shown to strongly resemble those of Frenkel exciton J-aggregates. The 11Bu exciton coherence length and effective mass are readily determined from the ratio of the 0–0 and 0–1 line strengths, I0 − 0/I0 − 1, in the photoluminescence spectrum. I0 − 0/I0 − 1 is shown to follow a T−1/2 dependence, in an excellent agreement with experiments on the red-phase of polydiacteylene.

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