Room-Temperature Micron-Scale Exciton Migration in a Stabilized Emissive Molecular Aggregate
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 si...
| Main Authors: | , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
American Chemical Society
2018
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| Online Access: | http://hdl.handle.net/1721.1/113346 https://orcid.org/0000-0003-1192-4746 https://orcid.org/0000-0002-2710-5545 https://orcid.org/0000-0002-9371-6109 https://orcid.org/0000-0003-2220-4365 https://orcid.org/0000-0002-6728-8163 |
| Summary: | 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 |
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