DOI: https://doi.org/10.29363/nanoge.incnc.2021.044
Publication date: 8th June 2021
Lead halide perovskite has attracted intensive research interests for its optoelectronic properties in the recent years, with applications in light emission, energy harvesting, solid state lasing, etc. One particular example is the quantum-confined single-halide CsPbBr3 perovskite nanoplatelets which is favourable for blue LEDs because of sharp emission linewidth whilst keeping phase stability [1,2]. However, their traditional batch synthesis approach faces problems of reproducibility and small production capacity [3].
In this work, we present the reproducible and size controlled continuous synthesis of CsPbBr3 nanoplatelets with sharp blue emission. Novel 3D reactor geometries are designed to precisely control mass transfer during the synthesis. Supported by computational fluid dynamics studies and on-line photoluminescence and absorption spectroscopy, we showed that enhanced mixing efficiency leads to more homogenous nucleation and hence smaller particle size. Using different reactors, CsPbBr3 nanoplatelets thickness can be tuned between 2.2 and 3.3 nm showing that mixing is important in both nucleation and growth steps. In this way, the photoemission can be effectively tuned from 500 to 472 nm. The processing rate of a single reactor is as high as 8.02 g per day of nanoplatelets and can be simply multiplied by setting up parallel reactors.
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