The importance of transport phenomena on the flow synthesis of monodispersed sharp blue-emitting perovskite CsPbBr3 nanoplatelets
| Autor: | Kaiwen Zhang, Yunhu Gao, Bruno Pinho, Robert L.Z. Hoye, Samuel D. Stranks, Laura Torrente-Murciano |
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| Rok vydání: | 2023 |
| Předmět: |
Technology
Engineering Chemical General Chemical Engineering 0904 Chemical Engineering SILVER NANOPARTICLES CAPPING LIGANDS 0905 Civil Engineering Industrial and Manufacturing Engineering Engineering Mixing Environmental Chemistry BR Science & Technology Growth rate Engineering Environmental Perovskite crystals LUMINESCENT COLLOIDAL CH3NH3PBX3 X MICROFLUIDIC PLATFORM General Chemistry Chemical Engineering Microreactors 0907 Environmental Engineering NANOCRYSTALS CESIUM LEAD HALIDE SHAPE NUCLEATION |
| Zdroj: | Chemical Engineering Journal. 451:138752 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2022.138752 |
| Popis: | This work demonstrates the importance of transport phenomena on the synthesis of halide perovskite nanoplatelets. 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 photoluminescence) 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. |
| Databáze: | OpenAIRE |
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