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The cross-over from coherent to incoherent exciton transport in disorderedpolymer films is studied by computationally solving a modified form of theRedfield equation for the exciton density matrix. This theory models quantummechanical (ballistic) and incoherent (diffusive) transport as limiting cases.It also reproduces Forster transport for certain parameter regimes. Using modelparameters appropriate to polymer thin films it is shown that short-timequantum mechanical coherence increases the exciton diffusion length. It alsocauses rapid initial energy relaxation and larger line widths. The route toequilibrium is, however, more questionable, as the equilibrium populations ofthe model do not satisfy the Boltzmann distributions over the site energies.The Redfield equation for the dimer is solved exactly to provide insight intothe numerical results

Role of quantum coherence and energetic disorder in exciton transport in polymer films