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Research Article

Bright and tunable emissive monodisperse CsPbI3@Cs4PbI6 nanocomposites via a precise and controllable dissolution−recrystallization method

Luyu Cao1, Bomei Liu2, Lin Huang2, Zhi Zhou3, Chong-Geng Ma4, Jian Zhang5, Jing Wang1( )
Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
School of Materials Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China
College of Science, Hunan Optical Agriculture Engineering Technology Research Center, Hunan Agricultural University, Changsha 410128, China
CQUPT-BUL Innovation Institute, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
Engineering Research Center of Electronic Information Materials and Devices (Ministry of Education), Guangxi Key Laboratory of Information Materials, Guangxi Collaborative Innovation Center of Structure and Property for New Energy and Materials, School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China
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Graphical Abstract

We provide a controllable dissolution–recrystallization method to synthesize emissive “Cs4PbI6” nanocrystals (NCs) from CsPbI3 precursor. Direct and systematic evidences clearly provide the photoluminescence origin comes from embedded CsPbI3 quantum dots (QDs), and the luminescence of this CsPbI3@Cs4PbI6 nanocomposites can be adjusted in a wide range from green to red.

Abstract

Nowadays, due to uncontrolled synthesis and lack of more direct and systematic evidences, the photoluminescence origin of “zero-dimensional” Cs4PbI6 remains great controversy and the luminescence cannot be controlled. Here we propose a controllable dissolution-recrystallization method to synthesize “emissive” and “non-emissive” Cs4PbI6 nanocrystals (NCs) respectively. Through comparing “emissive” and “non-emissive” Cs4PbI6 NCs, it is clearly proved that the visible emission in “emissive” Cs4PbI6 NCs comes from embedded CsPbI3 quantum dots (QDs). It is found for CsPbI3@Cs4PbI6 nanocomposites, methyl acetate (MeAC) and cyclohexane play an important role in dissolution and recrystallization respectively to obtain Cs4PbI6 matrix and CsPbI3 cores. Benefiting from this two-step method, the as-synthesized CsPbI3@Cs4PbI6 nanocomposites with CsPbI3 QDs uniformly distributed in Cs4PbI6 matrix are bright with photoluminescence quantum yield (PLQY) up to 71.4% and exhibit improved stability than CsPbI3 NCs. Moreover, utilizing its formation mechanism, the size of embedded CsPbI3 QDs can be controlled by reasonable designing the “dissolution” process, so that the luminescence of this CsPbI3@Cs4PbI6 nanocomposites can be adjusted in a wide range from green to red (554–630 nm). Our finding not only provides a novel method for synthesizing tunable “emissive” Cs4PbI6 NCs, but also makes clear the photoluminescence origin of “emissive” Cs4PbI6.

Keywords

CsPbI3@Cs4PbI6dissolution–recrystallizationnanocompositestunable emission

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Nano Research
Volume 16 Issue 1,
January 2023
Pages 1586-1594
DOI: 10.1007/s12274-022-4791-7
Cite this article:
Cao L, Liu B, Huang L, et al. Bright and tunable emissive monodisperse CsPbI3@Cs4PbI6 nanocomposites via a precise and controllable dissolution−recrystallization method. Nano Research, 2023, 16(1): 1586-1594. https://doi.org/10.1007/s12274-022-4791-7
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Received: 11 June 2022
Revised: 18 July 2022
Accepted: 19 July 2022
Published: 21 August 2022
© Tsinghua University Press 2022
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