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The dynamics of the exciton transport in poly( p -phenylene vinylene) (PPV) blended with a low concentration of fullerene molecules is monitored by time-resolved photoluminescence measurements. The diffusion driven motion of excitons toward these scavengers is modeled using a theory based on a random walk of a particle on lattice sites with traps. From this analysis an exciton diffusion constant of ( 4 ± 0.5 ) × 10 − 4 cm 2 ∕ s and a diffusion length of 7 nm are obtained. These exciton transport parameters are equivalent to results obtained in bilayer polymer/fullerene heterostructures, demonstrating that the exciton dynamics in PPV are dominated by a one-dimensional migration perpendicular to the film.
Physical Review B – American Physical Society (APS)
Published: Aug 15, 2006
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