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Temperature Dependence of Excitonic and Biexcitonic Decay Rates in Colloidal Nanoplatelets by Time-Gated Photon Correlation

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2020

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Benjamin, Elad
Yallapragada, Venkata Jayasurya
Amgar, Daniel
Yang, Gaoling
Oron, Dan

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The Journal of Physical Chemistry Letters. American Chemical Society (ACS). 2020, 11(16), pp. 6513-6518. eISSN 1948-7185. Available under: doi: 10.1021/acs.jpclett.0c01628

Zusammenfassung

Excitons in colloidal semiconductor nanoplatelets (NPLs) are weakly confined in the lateral dimensions. This results in significantly smaller Auger rates and, consequently, larger biexciton quantum yields, when compared to spherical quantum dots (QDs). Here we report a study of the temperature dependence of the biexciton Auger rate in individual CdSe/CdS core-shell NPLs, through the measurement of time-gated second-order photon correlations in the photoluminescence. We also utilize this method to directly estimate the single-exciton radiative rate. We find that whereas the radiative lifetime of NPLs increases with temperature, the Auger lifetime is almost temperature-independent. Our findings suggest that Auger recombination in NPLs is qualitatively similar to that of semiconductor quantum wells. Time-gated photon correlation measurements offer the unique ability to study multiphoton emission events, while excluding effects of competing fast processes, and can provide significant insight into the photophysics of a variety of nanocrystal multiphoton emitters.

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ISO 690BENJAMIN, Elad, Venkata Jayasurya YALLAPRAGADA, Daniel AMGAR, Gaoling YANG, Ron TENNE, Dan ORON, 2020. Temperature Dependence of Excitonic and Biexcitonic Decay Rates in Colloidal Nanoplatelets by Time-Gated Photon Correlation. In: The Journal of Physical Chemistry Letters. American Chemical Society (ACS). 2020, 11(16), pp. 6513-6518. eISSN 1948-7185. Available under: doi: 10.1021/acs.jpclett.0c01628
BibTex
@article{Benjamin2020-08-20Tempe-57793,
  year={2020},
  doi={10.1021/acs.jpclett.0c01628},
  title={Temperature Dependence of Excitonic and Biexcitonic Decay Rates in Colloidal Nanoplatelets by Time-Gated Photon Correlation},
  number={16},
  volume={11},
  journal={The Journal of Physical Chemistry Letters},
  pages={6513--6518},
  author={Benjamin, Elad and Yallapragada, Venkata Jayasurya and Amgar, Daniel and Yang, Gaoling and Tenne, Ron and Oron, Dan}
}
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