Journal
NANO LETTERS
Volume 14, Issue 12, Pages 6792-6798Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl5027953
Keywords
Photon correlation; single-molecule spectroscopy; semiconductor nanocrystals; multiexcitons
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Funding
- U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [DE-FG02-07ER46454]
- excitonic EFRC at MIT, an Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [DE-SC0001088]
- National Science Foundation Graduate Research Fellowship Program
- National Institutes of Health [9P41EB015871-26A1]
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The brightness of nanoscale optical materials such as semiconductor nanocrystals is currently limited in high excitation flux applications by inefficient multiexciton fluorescence. We have devised a solution-phase photon correlation measurement that can conveniently and reliably measure the average biexciton-to-exciton quantum yield ratio of an entire sample without user selection bias. This technique can be used to investigate the multiexciton recombination dynamics of a broad scope of synthetically underdeveloped materials, including those with low exciton quantum yields and poor fluorescence stability. Here, we have applied this method to measure weak biexciton fluorescence in samples of visible-emitting InP/ZnS and InAs/ZnS core/shell nanocrystals, and to demonstrate that a rapid CdS shell growth procedure can markedly increase the biexciton fluorescence of CdSe nanocrystals.
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