Efficient and controllable synthesis of High-Performance CsPbI3 nanocrystals based on a microreactor system

The application of CsPbI 3 nanocrystals (NCs) with excellent optical properties remains challenging due to their intrinsic environmental instability and low productivity by traditional batch methods. Here, we introduce a droplet-flow microreactor system for the efficient and controlled synthesis of CsPbI 3 NCs modified with poly (maleic anhydride-alt-1-octadecene) (PMA). Optimized within this system, the required PMA addition is reduced by 50 % compared to batch synthesis, while the resulting NCs exhibit a narrower emission peak, a higher photoluminescence quantum yield (PLQY) of 89 %, and an extended fluorescence lifetime. The strong Pb–O bond formed between PMA and the NC surface effectively passivates defects and enhances the environmental stability of CsPbI 3 NCs, with more than 75 % PLQY retained even after 40 days in water. Moreover, the system enables gram-scale production of high-performance CsPbI 3 nanocrystals in only 20 min. Red LED devices fabricated using these CsPbI 3 NCs as a color-conversion layer exceed the latest Rec. 2020 display standards on the CIE chromaticity coordinates.