Investigating the transformation of CsPbBr3 nanocrystals into highly stable CsPbBr3/Cs4PbBr6 nanocrystals using ethyl acetate in a microchannel reactor

Hanguang Lu; Yong Tang; Longshi Rao; Zongtao Li; Xinrui Ding; Cunjiang Song; Binhai Yu

doi:10.1088/1361-6528/ab15c7

Investigating the transformation of CsPbBr₃ nanocrystals into highly stable CsPbBr₃/Cs₄PbBr₆ nanocrystals using ethyl acetate in a microchannel reactor

Nanotechnology. 2019 Jul 19;30(29):295603. doi: 10.1088/1361-6528/ab15c7. Epub 2019 Apr 3.

Authors

Hanguang Lu¹, Yong Tang, Longshi Rao, Zongtao Li, Xinrui Ding, Cunjiang Song, Binhai Yu

Affiliation

¹ Engineering Research Centre of Green Manufacturing for Energy-Saving and New Energy Technology, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510640, People's Republic of China.

PMID: 30943456
DOI: 10.1088/1361-6528/ab15c7

Abstract

The nanocrystals (NCs) of inorganic perovskites CsPbX₃ and Cs₄PbX₆ (X = Cl, Br, I) are showing a great development potential due to their versatility of crystal structure. Here, we used a microchannel reactor to synthesize both CsPbBr₃ NCs (CsPbBr₃ NCs) and Cs₄PbBr₆ NCs with embedded CsPbBr₃ (CsPbBr₃/Cs₄PbBr₆ NCs). Via speed control of the precursor, ligands around the surface of NCs were effectively regulated by ethyl acetate, allowing the transformation from CsPbBr₃ NCs to CsPbBr₃/Cs₄PbBr₆ NCs in a short time, an outstanding stability of NCs, and a better crosslinking between NCs and polymer for the application of LEDs. Without any protection, the CsPbBr₃/Cs₄PbBr₆ NCs, with a production rate of 28 mg min^-1, retain more than 90% of the PL intensity after 84 d. Finally, the CsPbBr₃/Cs₄PbBr₆ NCs were used to produce an LED device, and a wide color gamut of 122.8% NTSC or 91.7% Rec 2020 was attained.