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Licensed Unlicensed Requires Authentication Published by De Gruyter (O) February 24, 2018

Enhancement of the Fluorescence Quantum Yield of Thiol-Stabilized CdTe Quantum Dots Through Surface Passivation with Sodium Chloride and Bicarbonate

  • Tetiana Dudka , Stephen V. Kershaw , Shumin Lin , Julian Schneider and Andrey L. Rogach EMAIL logo

Abstract

Colloidal quantum dots (QDs) have potential for several applications, e.g. as novel light sources; as photoluminescent probes; and for solar energy conversion devices, but their sensitivity towards their environmental surroundings, and the presence of surface defects may still degrade their emission properties. Herein, we present a post-synthetic treatment of CdTe QDs stabilized by mixed thiol ligands using chloride and bicarbonate ions to achieve near-complete surface passivation, resulting in a two-fold increase of the photoluminescence quantum yield (PL QY) and significant suppression of non-radiative recombination. Time-resolved PL measurements reveal fluorescence lifetime and PL QY trends did not both track identically; in the most favorable cases a suppression of non-radiative recombination and a slight increase in the radiative recombination rates after the salt treatment took place. The optimized conditions demonstrated here are proven to work for different sizes of CdTe QDs, and also show a dependence on the composition of the mixed ligand systems used.

Acknowledgements

This work was supported by the Research Grants Council of Hong Kong S.A.R. through the General Research Funds (project CityU 11302114). The authors appreciate numerous discussions and insights into the chemistry and photophysics of CdTe quantum dots from our long term collaborator and friend, Alexander Eychmüller, TU Dresden. Happy 60th anniversary, Alex!

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Received: 2018-02-01
Accepted: 2018-02-07
Published Online: 2018-02-24
Published in Print: 2018-08-28

©2018 Walter de Gruyter GmbH, Berlin/Boston

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