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Research Article

Precursor chemistry towards highly efficient and phase-stable red emitting CsPbI3 perovskite nanocrystals

Dejian Chen1,2, Decai Huang1,2, Mingwei Yang1,2, Kunyuan Xu1,2, Jie Hu1,2, Sisi Liang1,2, Haomiao Zhu1,2( )
CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences Fuzhou 350002 China
Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare Earth Materials Haixi Institute Chinese Academy of Sciences, Xiamen 361021 China
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Abstract

All-inorganic cesium lead halide perovskite nanocrystals (CsPbX3, X = Cl, Br, I) have attracted considerable scientific and technological interest due to their precise bandgap tunability, high color purity and efficient luminescence. Nevertheless, their poor stability in harsh conditions such as moisture, ultraviolet (UV) light irradiation and high temperature, is a major obstacle for their further commercial applications. Herein, by simply using a new type of precursor, namely "HPbX3" (X = Cl, Br, I), we can achieve the coordination equilibrium for Pb precursors during reaction and obtain high-quality perovskite nanocrystals with tremendously enhanced luminous efficiency and chemical stability based on hot-injection method. The prepared α-CsPbI3 nanocrystals exhibit an extremely high photoluminescence quantum yield of 96% and keep stable in air for more than two months without any post-synthesis treatment. Moreover, stability evaluations under UV light irradiation, water or thermal impact are also performed and the results show substantially improved stability of these nanocrystals as compared with the samples prepared using traditional PbI2 as precursor. Through temperature-dependent (10–300 K) steady and transient spectral analysis combined with compositional measurements, it is revealed that the lower structural defect density, which is guaranteed by abundant halogen when using HPbX3 as precursor, is the most important reason for such performance enhancement.

Keywords

perovskite nanocrystalsCsPbX3precursorstabilityvacancy defect

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Nano Research
Volume 15 Issue 1,
January 2022
Pages 644-652
DOI: 10.1007/s12274-021-3538-1
Cite this article:
Chen D, Huang D, Yang M, et al. Precursor chemistry towards highly efficient and phase-stable red emitting CsPbI3 perovskite nanocrystals. Nano Research, 2022, 15(1): 644-652. https://doi.org/10.1007/s12274-021-3538-1
Topics:
Perovskite

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Received: 23 February 2021
Revised: 14 April 2021
Accepted: 25 April 2021
Published: 14 June 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021
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