Bright and stable quantum confined CsPbBr_(3) nanocrystals through post-synthetic chemical cutting and in-situ encapsulation  

作　　者：Hao Zhang Jiang Chen Tiantian Zhu Rui Wang Xuemei Wang Xijun Xu Jianli Wang 

机构地区：[1]College of Chemical Engineering,Zhejiang University of Technology,Hangzhou 310014,China

出　　处：《Nano Research》2025年第2期896-904,共9页纳米研究(英文版)

基　　金：This work was supported by the National Natural Science Foundation of China(Nos.22109138 and 22178317).

摘　　要：Quantum-confined CsPbBr_(3) nanocrystals are promising cyan/blue-emitting materials with exceptional potential for advanced lighting and display technologies.However,their practical application is often limited by low luminescent efficiency,undesirable color purity and instability stemming from inadequate size uniformity,and high surface defect density.Here,we propose a post-synthetic chemical cutting and in-situ encapsulation approach using 3-aminopropyltriethoxysilane(APTES)combined with polymethylhydrosiloxane(PMHS)to synthesize and stabilize CsPbBr_(3) nanocrystals with significant quantum confinement.APTES can function as a chemical scissor efficiently cutting the green emitting CsPbBr_(3)(9.8 nm)to smaller counterparts(3.97.9 nm),while also passivating surface defects through A-site doping.Crosslinking between APTES and PMHS prevents phase transformation during synthesis and forms a polymeric network that encapsulates and separates the quantum confined CsPbBr_(3).The resulting composites exhibit tunable emission from 517 to 461 nm,a narrow linewidth of approximately 15 nm,and quantum yields over 80%.Moreover,incorporating one CsPbBr_(3) composite into a white light-emitting diode to fill the“cyan gap”significantly enhances the color rendering index from 77.7 to 86.4.This work provides an effective strategy for developing bright and stable quantum confined CsPbBr_(3) for advanced lighting applications.

关 键 词：perovskite nanocrystal CsPbBr quantum confinement luminescent efficiency stability 

分 类 号：TB383[一般工业技术—材料科学与工程]