Premium
Water‐Assisted Size and Shape Control of CsPbBr 3 Perovskite Nanocrystals
Author(s) -
Zhang Xiaoyu,
Bai Xue,
Wu Hua,
Zhang Xiangtong,
Sun Chun,
Zhang Yu,
Zhang Wei,
Zheng Weitao,
Yu William W.,
Rogach Andrey L.
Publication year - 2018
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.201710869
Subject(s) - nanocrystal , crystallinity , quantum yield , materials science , photoluminescence , perovskite (structure) , halide , yield (engineering) , crystallization , band gap , chemical engineering , nanotechnology , optoelectronics , optics , inorganic chemistry , chemistry , composite material , fluorescence , physics , engineering
Lead‐halide perovskites are well known to decompose rapidly when exposed to polar solvents, such as water. Contrary to this common‐place observation, we have found that through introducing a suitable minor amount of water into the reaction mixture, we can synthesize stable CsPbBr 3 nanocrystals. The size and the crystallinity, and as a result the band gap tunability of the strongly emitting CsPbBr 3 nanocrystals correlate with the water content. Suitable amounts of water change the crystallization environment, inducing the formation of differently shaped perovskites, namely spherical NCs, rectangular nanoplatelets, or nanowires. Bright CsPbBr 3 nanocrystals with the photoluminescence quantum yield reaching 90 % were employed for fabrication of inverted hybrid inorganic/organic light‐emitting devices, with the peak luminance of 4428 cd m −2 and external quantum yield of 1.7 %.