Colloidal perovskite nanocrystals comprised of all inorganic cesium lead halide (CsPbX3, X = Cl, Br, I or a mixture thereof) have potential as optical gain materials due to their high luminescence efficiency. In this work, cesium lead halide nanocrystals are continuously synthesized via a microreactor system consisting of poly(tetrafluoroethylene) (PTFE) capillaries. The synthesized nanocrystals possess excellent optical properties, including a full width at half maximum of 19–35 nm, high fluorescence quantum yield of 47.8–90.55%, and photoluminescence emission in the range of 450–700 nm. For the same precursor concentrations, the photoluminescence emission peak generally increases with increasing reaction temperature, revealing a controllable temperature effect on the photoluminescence characteristics of the synthesized nanocrystals. For quantum dots synthesized with a Br/I ratio of 1:3, a slight blue shift was observed for reaction temperatures greater than 100 °C. This PTFE-based microreactor system provides the unique capability of continuously synthesizing high-quality perovskite nanocrystals that emit over the full visible spectrum with applications ranging from displays and optoelectronic devices.
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This work was supported by National Natural Science Fund of China (51172072, 51475166).
Additional experimental data, color luminescence, photoluminescence spectra, high-resolution transmission electron microscopy images, absorption and photoluminescence emission spectra. [http://www.beilstein-journals.org/bjnano/content/ supplementary/2190-4286-8-252-S1.pdf]
Zhang, Chengxi; Luan, Weiling; Yin, Yuhang; and Yang, Fuqian, "PTFE-Based Microreactor System for the Continuous Synthesis of Full-Visible-Spectrum Emitting Cesium Lead Halide Perovskite Nanocrystals" (2017). Chemical and Materials Engineering Faculty Publications. 37.