Water‐Assisted Size and Shape Control of CsPbBr3 Perovskite Nanocrystals |
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| Authors: | Dr Xiaoyu Zhang Prof Xue Bai Hua Wu Xiangtong Zhang Chun Sun Prof Yu Zhang Prof Wei Zhang Prof Weitao Zheng Prof William W Yu Prof Andrey L Rogach |
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| Institution: | 1. State Key Laboratory on Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, China;2. Department of Materials Science, Key Laboratory of Mobile Materials MOE, State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun, China;3. Department of Chemistry and Physics, Louisiana State University, Shreveport, LA, USA;4. Department of Materials Science and Engineering, and Centre for Functional Photonics (CFP), City University of Hong Kong, Kowloon, Hong Kong SAR, Hong Kong |
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| Abstract: | 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 CsPbBr3 nanocrystals. The size and the crystallinity, and as a result the band gap tunability of the strongly emitting CsPbBr3 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 CsPbBr3 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 %. |
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| Keywords: | CsPbBr3 light-emitting device perovskite nanocrystals shape control water additive |
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