Room-Temperature Micron-Scale Exciton Migration in a Stabilized Emissive Molecular Aggregate
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Room-Temperature Micron-Scale Exciton Migration in a Stabilized Emissive Molecular Aggregate.pdf
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Author(s)
Eisele, Dörthe M.
Caram, Justin R
Doria, Sandra
Freyria, Francesca
Sinclair, Timothy Scott
Bawendi, Moungi G
Rebentrost, Frank
Lloyd, Seth
Date Issued
September 2016
Journal
Nano Letters
Publisher
American Chemical Society
Citation
Caram, Justin R., et al. “Room-Temperature Micron-Scale Exciton Migration in a Stabilized Emissive Molecular Aggregate.” Nano Letters, vol. 16, no. 11, Nov. 2016, pp. 6808–15. © 2016 American Chemical Society
Version
Author's final manuscript
Abstract
We report 1.6 ± 1 μm exciton transport in self-assembled supramolecular light-harvesting nanotubes (LHNs) assembled from amphiphillic cyanine dyes. We stabilize LHNs in a sucrose glass matrix, greatly reducing light and oxidative damage and allowing the observation of exciton–exciton annihilation signatures under weak excitation flux. Fitting to a one-dimensional diffusion model, we find an average exciton diffusion constant of 55 ± 20 cm2/s, among the highest measured for an organic system. We develop a simple model that uses cryogenic measurements of static and dynamic energetic disorder to estimate a diffusion constant of 32 cm2/s, in agreement with experiment. We ascribe large exciton diffusion lengths to low static and dynamic energetic disorder in LHNs. We argue that matrix-stabilized LHNS represent an excellent model system to study coherent excitonic transport.
Keywords: coherent exciton; exciton; exciton delocalization; exciton diffusion; J-aggregate; molecular aggregate
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1021/acs.nanolett.6b02529
