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Title: Sample-Averaged Biexciton Quantum Yield Measured by Solution-Phase Photon Correlation

Journal Article · · Nano Letters
DOI:https://doi.org/10.1021/nl5027953· OSTI ID:1210710
 [1];  [1];  [1];  [1];  [1];  [1]
  1. 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
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (3)

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