基于复合配体改性的CsPbBr_(3)钙钛矿量子点及其器件性能研究  

Study on the Properties of CsPbBr_(3) Perovskite Quantum Dots Modified by Complex Ligands

作　　者：周元庆 杨尊先[1,2] 郭太良[1,2] ZHOU Yuanqing;YANG Zunxian;GUO Tailiang(School of Physical and Information Engineering,Fuzhou University,Fuzhou 350116,CHN;National&Local United Engineering Laboratory of Flat Panel Display Technology,Fuzhou University,Fuzhou 350108,CHN)

机构地区：[1]福州大学物理与信息工程学院,福州350116 [2]福州大学平板显示技术国家地方联合工程实验室,福州350108

出　　处：《光电子技术》2023年第4期317-322,共6页Optoelectronic Technology

基　　金：国家自然科学基金项目(61574039);福建省自然基金项目(2022J01078);国家科技部重点研发计划项目(2016YFB0401503,2016YFB0401305,2016YFB0401103)。

摘　　要：量子点纯化工艺对铯铅溴(CsPbBr_(3))钙钛矿量子点(PQDs)光学和电学性能影响极其重要。提出一种简单可行的复合配体钝化策略,用来修饰PQDs表面缺陷。溴化胍(GuaBr)和二癸基二甲基溴化铵(DDeAB)在纯化过程中被引入共同修饰钙钛矿量子点。这种配体钝化策略能够有效地抑制空位缺陷,并提高胶体稳定性和电学性能。最终,基于复合配体改性的量子点,绿色的PeLED器件具有低的性能滚降和15786 cd/m^(2)的最大亮度。Purification process of quantum dots could exert great effect on the optical and electri-cal properties of Cesium lead bromine(CsPbBr_(3))perovskite quantum dots(PQDs).In this paper,a simple and feasible complex ligand passivation strategy was proposed to modify the surface defects of PQDs.Guanidine bromide(GuaBr)and didecyl dimethyl ammonium bromide(DDeAB)were intro-duced to modify perovskite quantum dots in the purification process.This ligand passivation strategy could effectively suppress vacancy defects and improve its electrical performance.Finally,based on the quantum dots modified by complex ligands,the green PeLED device could show low performance roll and the maximum brightness of 15786 cd/m^(2).

关 键 词：钙钛矿量子点 溴化胍 配体交换 绿色发射 卤素空位 

分 类 号：TN383[电子电信—物理电子学]