In situ synthesis of high-efficiency CsPbBr3/CsPb2Br5 composite nanocrystals in aqueous solution of microemulsion

Sunqi Lou; Zhi Zhou; Weijiang Gan; Tongtong Xuan; Zhen Bao; Shuaichen Si; Luyu Cao; Huili Li; Zhiguo Xia; Jianbei Qiu; Ru-Shi Liu; Jing Wang

doi:10.1039/D0GC02059A

In situ synthesis of high-efficiency CsPbBr₃/CsPb₂Br₅ composite nanocrystals in aqueous solution of microemulsion†

Sunqi Lou,^a Zhi Zhou,

*^b Weijiang Gan,^a Tongtong Xuan,

^c Zhen Bao,^d Shuaichen Si,^a Luyu Cao,^a Huili Li,

^e Zhiguo Xia,^f Jianbei Qiu,^gh Ru-Shi Liu

*^d and Jing Wang

*^a

Author affiliations

* Corresponding authors

^a Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry, School of Materials Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China
E-mail: ceswj@mail.sysu.edu.cn

^b College of Science, Hunan Optical Agriculture Engineering Technology Research Center, Hunan Agricultural University, Changsha City, Hunan 10128, China
E-mail: zhouzhi@hunau.edu.cn

^c College of Materials, Xiamen University, Xiamen 361005, China

^d Department of Chemistry and Advanced Research Center of Green Materials Science and Technology, National Taiwan University Taipei, Taiwan
E-mail: rsliu@ntu.edu.tw

^e Engineering Research Centre for Nanophotonics & Advanced Instrument, Ministry of Education, School of Physics and Materials Science, East China Normal University, Shanghai 200062, China

^f The State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, School of Materials Science and Technology, South China University of Technology, Guangzhou, China

^g Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming, China

^h Key Laboratory of Advanced Materials of Yunnan Province, Kunming, China

Abstract

Here, we present the microemulsion method using sodium dodecylbenzenesulfonate and hydrofluoric acid for the in situ synthesis of brightly luminescent CsPbBr₃/CsPb₂Br₅ composite nanocrystals (NCs) in aqueous solution. The obtained CsPbBr₃/CsPb₂Br₅ composite NCs exhibit a photoluminescence quantum yield of 77.0% and a full width at half maximum of 16.0 nm. And solid-state back-lighting devices were fabricated by combining CsPbBr₃/CsPb₂Br₅ composite NCs and red-emitting K₂SiF₆:Mn⁴⁺ phosphors with blue light. The as-fabricated device exhibits a wide color gamut of about 95.8% of the Rec. 2020. This work provides a green, low-cost, and in situ water-phase route to synthesize high-quality cesium lead halide NCs for their practical applications in solid-state back-lighting devices.

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In situ synthesis of high-efficiency CsPbBr₃/CsPb₂Br₅ composite nanocrystals in aqueous solution of microemulsion†

Abstract

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In situ synthesis of high-efficiency CsPbBr₃/CsPb₂Br₅ composite nanocrystals in aqueous solution of microemulsion

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