High-throughput preparation of Mn2+-doped CsPbCl3 nanocrystals via a fluidic channel reaction

Abstract

Transition metal ion and/or rare earth ion doped CsPbCl₃ nanocrystals (NCs) have attracted extensive attention due to their high combined emission efficiency characteristics. Their high-throughput preparation is of great significance for future industrialization that is still a challenge based on existing batch reaction technologies. Herein, we demonstrate a high-throughput preparation method of Mn²⁺-doped CsPbCl₃ NCs based on a fluidic channel reactor. The as-prepared NCs show vivid yellowish-orange emission at 600 nm and high photoluminescence quantum yield (PLQY) of 63.3%. Meaningfully, due to the closer bond between surface ligands and NCs, NCs prepared by this method show better water durability than NCs obtained using the traditional hot injection method. Finally, a WLED with a high color rendering index (CRI) of 94 and a low correlated color temperature (CCT) of 3626 K was fabricated by combining the as-prepared yellowish-orange Mn-doped CsPbCl₃ with the BaMgAl₁₀O₁₇:Eu²⁺ (BAM:Eu²⁺) blue phosphor and CaAlSiN₃:Eu²⁺ (CASN:Eu²⁺) red phosphor on a 375 nm ultraviolet chip. These findings suggest that the Mn-doped CsPbCl₃ prepared by the fluidic channel reaction is suitable for WLEDs. Our work paves the way for achieving a continuous, large-scale preparation of perovskite NCs by a fluidic channel reaction for the development of their WLED solid state lighting applications.