Composition engineering to obtain efficient hybrid perovskite light-emitting diodes

作     者：Chuanzhong YAN Kebin LIN Jianxun LU Zhanhua WEI Chuanzhong YAN;Kebin LIN;Jianxun LU;Zhanhua WEI

作者机构：These authors contributed equally to this work.Institute of Luminescent Materials and Information DisplaysCollege of Materials Science and EngineeringHuaqiao UniversityXiamen 361021China 

出 版 物：《Frontiers of Optoelectronics》 (光电子前沿（英文版）)

年 卷 期：2020年第13卷第3期

页      面：282-290页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51802102,21805101,and 51902110) Natural Science Foundation of Fujian Province(No.2019J01057) Promotion Program for Young and Middle-aged Teacher in Science and Technology Research of Huaqiao University(No.ZQN-PY607) Scientific Research Funds of Huaqiao University(Nos.16BS201,17BS409,and 19BS105). 

主　　题：perovskite light-emitting diode(LED) composition engineering ion doping 

摘      要：Metal halide perovskites have received considerable attention in the field of electroluminescence,and the external quantum efficiency of perovsk c lightemitting diodes has exceeded 20%.CH3NH3PbBr3 has been intensely investigated as an emitting layer in perovskite light-emitting diodes.However,perovskite films comprising CH3NH3PbBr3 often exhibit low surface coverage and poor crystallinity,leading to high current leakage,severe nonradiative recombination,and limited device performance.Herein,we demonstrate a rationale for composition engineering to obtain high-quality perovskite films.We first reduce pinholes by adding excess CH3NH3B1 to the actual CH3NH3PbBr3 films,and we then add CsBr to improve the crystalline quality and to passivate nonradiative defects.As a result,the(CH3NH3)1-xCSxPbBx based perovskite light-emitting diodes exhibit significantly improved external quantum and power efficiencies of 6.97%and 25.181m/W,respectively,representing an improvement in performance dozens of times greater than that of pristine CH3NH3PbBr3-based perovskite light-emitting diodes.Our study demonstrates that composition engineering is an effective strategy for enhancing the device performance of perovskite light-emitting diodes.