Journal
NANO LETTERS
Volume 10, Issue 2, Pages 620-626Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl9036559
Keywords
Single molecule spectroscopy; fluorescence quantum yield; fluorescence brightness; energy migration; J-aggregate
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Funding
- European Science Foundation within COST [D35]
- Swedish Research Council
- Royal Physiographic Society in Lund
- Knut & Alice Wallenberg
- Crafoord Foundation
- Swedish Foundation Institute
- Marie Curie IIF
- Deutsche Forschungsgemeinschaft (DFG)
- Linnaeus Grant to Lund Laser Centre
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Fluorescence blinking corresponding to collective quenching of up to 100 dye monomers is reported for individual J-aggregates of a perylene bisimide (PBI) dye. This implies an exciton diffusion length up to 70 nm in these one-dimensional assemblies. The number of quenched monomers was directly measured by comparing the fluorescence brightness of the J-aggregates with that of noncoupled PBI molecules. This brightness analysis technique is useful for unraveling photophysical parameters of any individual fluorescent nanosystem.
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