Large-scale heterogeneous synthesis of monodisperse high performance colloidal CsPbBr_(3)nanocrystals  

作　　者：Weinan Xue Xin Zhang Wei Zhu Xue Zhang Wei Wang Linwei Peng Xiang Ma Yan Li 

机构地区：[1]Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center,School of Chemistry and Molecular Engineering,East China University of Science and Technology,Shanghai 200237,China

出　　处：《Fundamental Research》2024年第5期1137-1146,共10页自然科学基础研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(21771063,21975075,22125803 and 22020102006);the Fellowship of China Postdoctoral Science Foundation(2020M681207)。

摘　　要：Colloidal lead halide perovskite nanocrystals(LHP NCs)are promising semiconductor materials for optoelectronic devices,but the high ionicity of LHP NCs makes their crystallization control and post-treatment difficult.Here,phosphonic acids(PAs)are employed as ligands to design a solid-liquid heterogeneous reaction system to regulate the LHP NC crystallization and achieve the desired focusing growth.During the heterogeneous synthesis,the precursors in the liquid phase are responsible for the burst nucleation and initial growth of NCs.Afterwards,the focusing growth of NCs is supported by the precursors released from the solid phase.In addition,the strong binding ability of PAs enables effective passivation of LHP NCs.Without post-treatment,gram-scale monodisperse CsPbBr_(3)NCs having photoluminescence with a full width at half-maximum of 18 nm and a quantum yield of near-unity are obtained.The CsPbBr_(3)NCs covered by a compact ligand layer keep initial quantum yield even after 18 cycles of purification,exhibiting excellent stability against polar solvents,ultraviolet irradiation and heat treatment.As scintillators,the prepared CsPbBr_(3)NCs show strong radioluminescence emission and high-resolution X-ray imaging.

关 键 词：Perovskite nanocrystals Heterogeneous synthesis High monodispersity Unity photoluminescence quantum yield Scintillator 

分 类 号：TB383[一般工业技术—材料科学与工程]