1. Investigating the transformation of CsPbBr3 nanocrystals into highly stable CsPbBr3/Cs4PbBr6 nanocrystals using ethyl acetate in a microchannel reactor
- Author
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Xinrui Ding, Rao Longshi, Binhai Yu, Zongtao Li, Lu Hanguang, Yong Tang, and Song Cunjiang
- Subjects
Materials science ,Ethyl acetate ,Bioengineering ,02 engineering and technology ,Crystal structure ,010402 general chemistry ,01 natural sciences ,law.invention ,chemistry.chemical_compound ,law ,General Materials Science ,Electrical and Electronic Engineering ,chemistry.chemical_classification ,Microchannel ,Mechanical Engineering ,General Chemistry ,Polymer ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Chemical engineering ,chemistry ,Nanocrystal ,Mechanics of Materials ,Microreactor ,0210 nano-technology ,Light-emitting diode ,Production rate - 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.
- Published
- 2019