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Near‐Unity Photoluminescence Quantum Efficiency for All CsPbX 3 (X=Cl, Br, and I) Perovskite Nanocrystals: A Generic Synthesis Approach
Author(s) -
Dutta Anirban,
Behera Rakesh Kumar,
Pal Poulami,
Baitalik Sujoy,
Pradhan Narayan
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201900374
Subject(s) - halide , nanocrystal , perovskite (structure) , reagent , photoluminescence , ion , ammonium , inorganic chemistry , materials science , chemistry , nanotechnology , crystallography , organic chemistry , optoelectronics
In a generic synthesis approach, all three CsPbX 3 (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.