Controlled synthesis and photostability of blue emitting Cs3Bi2Br9 perovskite nanocrystals by employing weak polar solvents at room temperature

Mingyang Gao; Chi Zhang; Linyuan Lian; Jianwei Guo; Yong Xia; Fan Pan; Xiaoming Su; Jianbing Zhang; Honglang Li; Daoli Zhang

doi:10.1039/C9TC00400A

Controlled synthesis and photostability of blue emitting Cs₃Bi₂Br₉ perovskite nanocrystals by employing weak polar solvents at room temperature†

Mingyang Gao,‡^ab Chi Zhang,

‡^acd Linyuan Lian,^ae Jianwei Guo,^a Yong Xia,^ae Fan Pan,^a Xiaoming Su,^a Jianbing Zhang,

^ae Honglang Li*^f and Daoli Zhang

*^abg

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* Corresponding authors

^a School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Road, Hongshan District, Wuhan City, Hubei Province, P. R. China
E-mail: zhang_daoli@hust.edu.cn

^b China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, 1037 Luoyu Road, Hongshan District, Wuhan Hubei 430074, P. R. China

^c Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA

^d Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA

^e Engineering Research Centre for Functional Ceramics, The Ministry of Education, Huazhong University of Science and Technology, 1037 Luoyu Road, Hongshan District, Wuhan Hubei 430074, P. R. China

^f Institute of Acoustics, Chinese Academy of Sciences, 21 North 4th Ring Road, Haidian District, Beijing, P. R. China
E-mail: lhl@mail.ioa.ac.cn

^g Department of Chemistry and Biochemistry, University of Maryland, 8051 Regent Drive, College Park, MD 20742, USA

Abstract

Metal halide nanocrystals (NCs) have attracted intensive interest due to their unique optical properties and cheap synthesis which endows them with tremendous potential for application in the field of optoelectronic devices. However, lead toxicity obstructs their commercialization. Therefore, environment- and consumer-friendly all-inorganic lead-free perovskite NCs are highly desirable in terms of application, and recent efforts have investigated lead-free halide perovskite NCs. Herein, in this present work, all-inorganic Cs₃Bi₂Br₉ perovskite NCs were synthesized for the first time with a weak-polar solvent at room temperature (WPRT). As-synthesized Cs₃Bi₂Br₉ perovskite NCs demonstrated blue dual-emission peaks at 414 nm and 433 nm with a full width at half-maximum (FWHM) of 50 nm and a photoluminescence quantum yield (PLQY) up to 29.6%. Notably, the NCs exhibited high stability upon air exposure exceeding three weeks since the trap states could be passivated under humid conditions. Furthermore, it was also found that potassium oleate (K-OA) solution could enhance the PLQY of Cs₃Bi₂Br₉ perovskite NCs.

Journal of Materials Chemistry C

Controlled synthesis and photostability of blue emitting Cs₃Bi₂Br₉ perovskite nanocrystals by employing weak polar solvents at room temperature†

Abstract

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Controlled synthesis and photostability of blue emitting Cs₃Bi₂Br₉ perovskite nanocrystals by employing weak polar solvents at room temperature

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Journal of Materials Chemistry C