The importance of transport phenomena on the flow synthesis of monodispersed sharp blue-emitting perovskite CsPbBr3 nanoplatelets

被引:9
作者
Zhang, Kaiwen [1 ]
Gao, Yunhu [1 ]
Pinho, Bruno [1 ]
Hoye, Robert L. Z. [2 ]
Stranks, Samuel D. [1 ,3 ]
Torrente-Murciano, Laura [1 ]
机构
[1] Univ Cambridge, Dept Chem Engn & Biotechnol, Philippa Fawcett Dr, Cambridge CB3 0AS, England
[2] Imperial Coll London, Dept Mat, Exhibit Rd, London SW7 2AZ, England
[3] Univ Cambridge, Dept Phys, Cavendish Lab, JJ Thomson Ave, Cambridge CB3 0HE, England
基金
英国工程与自然科学研究理事会; 欧洲研究理事会;
关键词
Perovskite crystals; Mixing; Microreactors; Growth rate; CESIUM LEAD HALIDE; COLLOIDAL CH3NH3PBX3 X; MICROFLUIDIC PLATFORM; SILVER NANOPARTICLES; CAPPING LIGANDS; NANOCRYSTALS; LUMINESCENT; SHAPE; BR; NUCLEATION;
D O I
10.1016/j.cej.2022.138752
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This work demonstrates the importance of transport phenomena on the synthesis of halide perovskite nano -platelets. Illustrated herein for CsPbBr3, we demonstrate the need for fast and homogeneous mixing to achieve monodispered crystals, in this case with sharp blue emission. The modularity of our synthesis method, combining fluid dynamic simulations, bespoke 3D flow reactors and on-line measurements (UV-vis absorbance and pho-toluminescence) reveals fundamental understanding about the growth of these perovskite nano-materials, which in turn leads to superlative size reducibility (2.2 +/- 0.3 nm) and properties (sharp blue emission at 472 nm wavelength, and PLQY 24.5 +/- 0.4 %). The counterpart conventional hot injection batch synthesis with the same precursors, conditions and reaction temperature yields a product with PL at 501 nm with large batch to batch variations. Understanding the dynamics of the synthesis in the very early stages (within the first 100-300 ms) shows that mixing of the precursors plays a key role not only during the nucleation step, as previously believed, but also during the growth stage. Such fluid properties can be easily predicted in purposefully designed 3D microreactors to provide a consistent and steady output capable of fulfilling the large demand of blue light emitters for a variety of applications.
引用
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页数:9
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