Continuous-flow synthesis of CsPbI 3 /TiO 2 nanocomposites with enhanced water and thermal stability.

The inherent poor stability of CsPbI 3 nanocrystals hinders the practical application of this material. Therefore, it is still a challenge to improve the stability of CsPbI 3 nanocrystals and realize their large-scale continuous preparation. In this work, we report the preparation of CsPbI 3 /TiO 2 nanocomposites with high stability by a microfluidic method. After the combination of CsPbI 3 nanorods with TiO 2 , the PL intensity increased by 1.3 times under excitation at 577 nm due to the passivating effect of TiO 2 on the surface of CsPbI 3 nanorods and its carrier transport characteristics. Meanwhile, due to the coating of TiO 2 , the surface exposure area of CsPbI 3 nanorods is reduced, which blocks external environmental effects to some extent and effectively improves the stability of CsPbI 3 nanorods. Finally, an LED with a color gamut of 142% NTSC and a color temperature (CCT) of 3952 K was obtained by combining CsPbI 1.5 Br 1.5 /TiO 2 and CsPbBr 3 /TiO 2 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.