Journal
SCIENCE
Volume 331, Issue 6017, Pages 565-567Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1199140
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- U.S. Department of Energy
- Welch Foundation
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In conjugated polymers, radiative recombination of excitons (electron-hole pairs) competes with nonradiative thermal relaxation pathways. We visualized exciton quenching induced by hole polarons in single-polymer chains in a device geometry. The distance-scale for quenching was measured by means of a new subdiffraction, single-molecule technique-bias-modulated intensity centroid spectroscopy-which allowed the extraction of a mean centroid shift of 14 nanometers for highly ordered, single-polymer nanodomains. This shift requires energy transfer over distances an order of magnitude greater than previously reported for bulk conjugated polymers and far greater than predicted by the standard mechanism for exciton quenching, the unbiased diffusion of free excitons to quenching sites. Instead, multistep energy funneling to trapped, localized polarons is the probable mechanism for polaron-induced exciton quenching.
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