Hou Jingshan, Hu Jiafeng, Wu Jianghua, Zhang Qing, Liu Zhifu, Dong Langping, Jiang Guangxiang, Liu Yufeng, Gao Wei, Fang Yongzheng
School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, 201418, China.
Dalton Trans. 2024 Aug 13;53(32):13427-13435. doi: 10.1039/d4dt01763c.
The inherent poor stability of CsPbI nanocrystals hinders the practical application of this material. Therefore, it is still a challenge to improve the stability of CsPbI nanocrystals and realize their large-scale continuous preparation. In this work, we report the preparation of CsPbI/TiO nanocomposites with high stability by a microfluidic method. After the combination of CsPbI nanorods with TiO, the PL intensity increased by 1.3 times under excitation at 577 nm due to the passivating effect of TiO on the surface of CsPbI nanorods and its carrier transport characteristics. Meanwhile, due to the coating of TiO, the surface exposure area of CsPbI nanorods is reduced, which blocks external environmental effects to some extent and effectively improves the stability of CsPbI nanorods. Finally, an LED with a color gamut of 142% NTSC and a color temperature (CCT) of 3952 K was obtained by combining CsPbIBr/TiO and CsPbBr/TiO nanocomposites with a blue light chip (455 nm). This study shows that the continuous and controllable synthesis of all inorganic halide perovskite nanocrystals by a microfluidic method is of great significance in the fabrication of high-performance optoelectronic materials and display devices.
CsPbI纳米晶体固有的稳定性差阻碍了这种材料的实际应用。因此，提高CsPbI纳米晶体的稳定性并实现其大规模连续制备仍然是一项挑战。在这项工作中，我们报道了通过微流控方法制备具有高稳定性的CsPbI/TiO纳米复合材料。CsPbI纳米棒与TiO结合后，由于TiO对CsPbI纳米棒表面的钝化作用及其载流子传输特性，在577nm激发下PL强度提高了1.3倍。同时，由于TiO的包覆，CsPbI纳米棒的表面暴露面积减小，在一定程度上阻断了外部环境的影响，有效提高了CsPbI纳米棒的稳定性。最后，通过将CsPbIBr/TiO和CsPbBr/TiO纳米复合材料与蓝光芯片（455nm）相结合，获得了色域为142%NTSC、色温（CCT）为3952K的发光二极管。这项研究表明，通过微流控方法连续可控地合成全无机卤化物钙钛矿纳米晶体在高性能光电子材料和显示器件的制造中具有重要意义。
