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Near-Unity Photoluminescence Quantum Efficiency for All CsPbX 3 (X=Cl, Br, and I) Perovskite Nanocrystals: A Generic Synthesis Approach

In a generic synthesis approach, all three CsPbX (X=Cl, Br and I) perovskite nanocrystals having near unity quantum yields is reported. This has been achieved by injecting the desired amount of preformed alkylammonium halide salts which acted as a dual source providing halide ions and the capping ag...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2019-04, Vol.58 (17), p.5552-5556
Main Authors: Dutta, Anirban, Behera, Rakesh Kumar, Pal, Poulami, Baitalik, Sujoy, Pradhan, Narayan
Format: Article
Language:English
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Summary:In a generic synthesis approach, all three CsPbX (X=Cl, Br and I) perovskite nanocrystals having near unity quantum yields is reported. This has been achieved by injecting the desired amount of preformed alkylammonium halide salts which acted as a dual source providing halide ions and the capping agent to an equimolar amount of non-halide Pb and Cs precursors in a reaction flask at an optimized reaction temperature. The composition sensitivity of Pb to Cs ratio, high temperature reaction, and injection of ammonium halide remained the key parameters for obtaining the high quantum yields. Details of the reaction process, use of different reagents and setting up the reaction parameters are reported.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201900374