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The recombination of electron-hole pairs injected in extended conjugatedsystems is modeled as a multi-pathway vibron-driven relaxation in monoexcitedstate-space. The computed triplet-to-singlet ratio of exciton formation times$r = \tau_T/\tau_S$ increases from 0.9 for a model dimer to 2.5 for a 32-unitchain, in excellent agreement with experiments. Therewith we rationalizerecombination efficiency in terms of spin-dependent interstate vibroniccoupling and spin- and conjugation-length-dependent exciton bindingenergies.Our model calculations for various length polymers indicate that theratio of the singlet to triplet formation ratios, $r = \sigma_S/\sigma_T$, isinversely related to the ratio of the singlet and triplet binding energies,$\epsilon^b_S/\epsilon^b_T$

Spin-Dependent Electron-Hole Capture Kinetics in Luminescent Conjugated Polymers