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Anisotropy of exciton migration in poly( p -phenylene vinylene)

Anisotropy of exciton migration in poly( p -phenylene vinylene) 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Anisotropy of exciton migration in poly( p -phenylene vinylene)

Physical Review B , Volume 74 (8) – Aug 15, 2006
5 pages

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Publisher
American Physical Society (APS)
Copyright
Copyright © 2006 The American Physical Society
ISSN
1550-235X
DOI
10.1103/PhysRevB.74.085206
Publisher site
See Article on Publisher Site

Abstract

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.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Aug 15, 2006

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