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Sample-averaged biexciton quantum yield measured by solution-phase photon correlation.

Andrew P Beyler1, Thomas S Bischof, Jian Cui

  • 1Department of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.

Nano Letters
|November 20, 2014
PubMed
Summary
This summary is machine-generated.

We developed a new photon correlation method to measure multiexciton fluorescence in semiconductor nanocrystals. This technique enhances the brightness of optical materials by improving biexciton quantum yields.

Keywords:
Photon correlationmultiexcitonssemiconductor nanocrystalssingle-molecule spectroscopy

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Nanoscale optical materials, like semiconductor nanocrystals, face brightness limitations in high excitation flux applications due to inefficient multiexciton fluorescence.
  • Understanding multiexciton recombination dynamics is crucial for improving nanocrystal performance.

Purpose of the Study:

  • To develop a convenient and reliable method for measuring the average biexciton-to-exciton quantum yield ratio in semiconductor nanocrystals.
  • To investigate multiexciton recombination dynamics in a wide range of materials, including those with low quantum yields and poor fluorescence stability.

Main Methods:

  • A solution-phase photon correlation measurement technique was devised.
  • The method allows for unbiased measurement of the biexciton-to-exciton quantum yield ratio across an entire sample.

Main Results:

  • The technique was successfully applied to measure weak biexciton fluorescence in visible-emitting InP/ZnS and InAs/ZnS core/shell nanocrystals.
  • A rapid Cadmium Sulfide (CdS) shell growth procedure was shown to significantly enhance the biexciton fluorescence of Cadmium Selenide (CdSe) nanocrystals.

Conclusions:

  • The developed photon correlation method offers a reliable way to assess multiexciton fluorescence in semiconductor nanocrystals.
  • Optimizing shell growth conditions, such as CdS shell deposition, can improve biexciton fluorescence and thus the brightness of nanocrystal-based optical materials.