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Monodisperse and brightly luminescent CsPbBr3/Cs4PbBr6 perovskite composite nanocrystals

Abstract

Microscale composite structure strategy by embedding CsPbBr3 nanocrystals (NCs) in microscale Cs4PbBr6 matrix (CPB113/CPB416) has successfully demonstrated its ability in resolving fluorescence quenching of perovskite NCs in the solid agglomeration state due to loss of quantum confinement. Unfortunately, controllable synthesis of monodisperse nanoscale composite with bright emission in solid state remains a great challenge. Here, we first present a novel supersaturated recrystallization process to controllably synthesize monodisperse CPB113/CPB416 composite NCs with bright emission in solid form, where CsPbBr3 NCs uniformly embedded in nano hexagonal Cs4PbBr6 matrix. The existence of 2-Methylimidazole (MeIm) not only can control the composition rate of CsPbBr3 to Cs4PbBr6, the size and dispersity of CsPbBr3 in the composite NCs but also can help to controllably obtain monodisperse and hexagonal Cs4PbBr6 matrix. As-prepared composite structure can effectively prevent CsPbBr3 fluorescence quenching and make the composite NCs have a high photoluminescence quantum yield (PLQY) of 83%. In addition, we obtained tunable blue to red emitting composite NCs through varying halide salts.

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Publication details

The article was received on 12 Feb 2018, accepted on 02 May 2018 and first published on 03 May 2018


Article type: Communication
DOI: 10.1039/C8NR01266K
Citation: Nanoscale, 2018, Accepted Manuscript
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    Monodisperse and brightly luminescent CsPbBr3/Cs4PbBr6 perovskite composite nanocrystals

    T. Xuan, S. Lou, J. Huang, L. Cao, X. Yang, H. Li and J. Wang, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR01266K

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