Sample-Averaged Biexciton Quantum Yield Measured by Solution-Phase Photon Correlation
Author(s)Beyler, Andrew P.; Bischof, Thomas Stanley; Cui, Jian; Coropceanu, Igor; Harris, Daniel Kelly; Bawendi, Moungi G; ... Show more Show less
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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.
DepartmentMassachusetts Institute of Technology. Department of Chemistry
American Chemical Society (ACS)
Beyler, Andrew P.; Bischof, Thomas S.; Cui, Jian; Coropceanu, Igor; Harris, Daniel K. and Bawendi, Moungi G. “Sample-Averaged Biexciton Quantum Yield Measured by Solution-Phase Photon Correlation.” Nano Letters 14, 12 (December 2014): 6792–6798 © 2014 American Chemical Society
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