Sample-Averaged Biexciton Quantum Yield Measured by Solution-Phase Photon Correlation
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Chemistry
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 in this study, 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.
- Research Organization:
- Energy Frontier Research Centers (EFRC). Center for Excitonics (CE)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Institutes of Health (NIH)
- Contributing Organization:
- CE partners with Massachusetts Institute of Technology (lead); Brookhaven National Laboratory; Harvard University
- Grant/Contract Number:
- SC0001088; FG02-07ER46454; 9P41EB015871-26A1
- OSTI ID:
- 1210710
- Journal Information:
- Nano Letters, Vol. 14, Issue 12; ISSN 1530-6984
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Effects of interface-potential smoothness and wavefunction delocalization on Auger recombination in colloidal CdSe-based core/shell quantum dots
|
journal | December 2019 |
Excited-State Dynamics in Colloidal Semiconductor Nanocrystals
|
journal | August 2016 |
Excited-State Dynamics in Colloidal Semiconductor Nanocrystals
|
book | August 2016 |
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
solar (photovoltaic)
solid state lighting
photosynthesis (natural and artificial)
charge transport
optics
synthesis (novel materials)
synthesis (self-assembly)
synthesis (scalable processing)
multiexcitons
Photon correlation
semiconductor nanocrystals
single-molecule spectroscopy