Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 56, Issue 32, Pages 9571-9576Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201705595
Keywords
coordinating solvents; lead halide perovskites; methylammonium; nanocrystals; ultrasonication
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Funding
- Research Grant Council of Hong Kong S.A.R. (GRF project) [CityU 11337616),]
- Natural Science Foundation of Youth Fund Project of China [51602024]
- China Postdoctoral Science Foundation [2014M550621]
- Hong Kong Scholar Program [XJ2014046]
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A top-down method is demonstrated for the fabrication of CH3NH3PbBr3 and CH3NH3PbI3 perovskite nanocrystals, employing a mixture of ligands oleic acid and oleylamine as coordinating solvents. This approach avoids the use of any polar solvents, skips multiple reaction steps by employing a simple ultrasonic treatment of the perovskite precursors, and yields rather monodisperse blue-, green-, and red-emitting methylammonium lead halide nanocrystals with a high photoluminescence quantum yield (up to 72% for the green-emitting nanocrystals) and remarkably improved stability. After discussing all relevant reaction parameters, the green-emitting CH3NH3PbBr3 nanocrystals are employed as a component of down-conversion white-light-emitting devices.
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