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Nano Research

Article Title

Room temperature preparation of highly stable cesium lead halide perovskite nanocrystals by ligand modification for white light-emitting diodes

Authors

Yu Zhang, Engineering Research Center for Nanophotonics and Advanced Instrument of Ministry of Education, Key Laboratory of Polar Materials and Devices (Ministry of Education), The Extreme Optoelectromechanics Laboratory, Department of Materials, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China
Guishun Li, Engineering Research Center for Nanophotonics and Advanced Instrument of Ministry of Education, Key Laboratory of Polar Materials and Devices (Ministry of Education), The Extreme Optoelectromechanics Laboratory, Department of Materials, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China
Changkun She, Engineering Research Center for Nanophotonics and Advanced Instrument of Ministry of Education, Key Laboratory of Polar Materials and Devices (Ministry of Education), The Extreme Optoelectromechanics Laboratory, Department of Materials, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China
Shaohua Liu, Engineering Research Center for Nanophotonics and Advanced Instrument of Ministry of Education, Key Laboratory of Polar Materials and Devices (Ministry of Education), The Extreme Optoelectromechanics Laboratory, Department of Materials, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China
Fangyu Yue, Engineering Research Center for Nanophotonics and Advanced Instrument of Ministry of Education, Key Laboratory of Polar Materials and Devices (Ministry of Education), The Extreme Optoelectromechanics Laboratory, Department of Materials, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China
Chengbin Jing, Engineering Research Center for Nanophotonics and Advanced Instrument of Ministry of Education, Key Laboratory of Polar Materials and Devices (Ministry of Education), The Extreme Optoelectromechanics Laboratory, Department of Materials, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, ChinaFollow
Ya Cheng, Engineering Research Center for Nanophotonics and Advanced Instrument of Ministry of Education, Key Laboratory of Polar Materials and Devices (Ministry of Education), The Extreme Optoelectromechanics Laboratory, Department of Materials, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China
Junhao Chu, Engineering Research Center for Nanophotonics and Advanced Instrument of Ministry of Education, Key Laboratory of Polar Materials and Devices (Ministry of Education), The Extreme Optoelectromechanics Laboratory, Department of Materials, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China

Keywords

perovskite nanocrystals, ligand modification, stability, white light-emitting diode

Abstract

The poor stability of halide perovskite nanocrystals (NCs) has severely hindered future practical application. Herein, we proposed a facile and effective ligand modification route to synthesize stable CsPbBr3 nanocrystals by introducing a double-terminal ligand, namely 4,4'-Azobis(4-cyanovalericacid) (CA), to replace the conventional oleic acid (OA) ligand at room temperature. The as-synthesized CsPbBr3-CA not only possesses high photoluminescence quantum yield (72%) related to the reduced trap defects, but also shows significantly improved stability exposure to water, ethanol, light, and/or heat benefiting from the CA ligand anchored to NC surfaces tightly. The photoluminescence intensity of CsPbBr3-CA maintains about 80% and 75% of its initial emission intensity after immersed in water or ethanol for 360 min, respectively, whereas that of the CsPbBr3-OA was quenched completely within a few minutes. Moreover, an all-inorganic white light-emitting diode (LED) covered 126% National Television System Committee (NTSC) standard and 92% Rec.2020 standard was fabricated by combining the green CsPbBr3-CA and commercial red-emitting K2SiF6:Mn4+ (KSF) phosphors onto a blue LED chip. Thus, the presented work initiates the development of the room temperature preparation of high quality CsPbBr3 and shows prospect for next-generation displays.

Publisher

Tsinghua University Press

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