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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
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201710869
Subject(s) - nanocrystal , crystallinity , quantum yield , photoluminescence , materials science , perovskite (structure) , halide , yield (engineering) , crystallization , chemical engineering , nanotechnology , band gap , crystallography , optoelectronics , chemistry , inorganic chemistry , optics , fluorescence , composite material , 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 %.