Stabilizing electroluminescence color of blue perovskite LEDs via amine group doping

作     者：Fengjuan Zhang Jizhong Song Bo Cai Xi Chen Changting Wei Tao Fang Haibo Zeng 张枫娟;宋继中;蔡波;陈喜;魏昌庭;方涛;曾海波

作者机构：School of Materials Science and EngineeringMIIT Key Laboratory of Advanced Display Materials and DevicesInstitute of Optoelectronics&NanomaterialsNanjing University of Science and TechnologyNanjing 210094China 

出 版 物：《Science Bulletin》 (科学通报（英文版）)

年 卷 期：2021年第66卷第21期

页      面：2189-2198,M0004页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 0803[工学-光学工程] 

基　　金：the National Natural Science Foundation of China(61725402,51922049) the Fundamental Research Funds for the Central Universities(30919012107,30920032102) the National“Ten Thousand Talents Plan”Leading Talents(W03020394) the Six Top Talent Innovation Teams of Jiangsu Province(TD-XCL-004) the Natural Science Foundation of Jiangsu Province(BK2018002) 

主　　题：Light-emitting diodes Perovskites Quantum dots Hydrogen bond Amine-group doping Color stability 

摘      要：Voltage loading-induced change in the electroluminescence(EL)wavelength of mixed halide perovskite light-emitting diodes(PeLEDs),so-called color-shift,has become an inevitable phenomenon,which is seriously unfavorable to their applications in lighting and ***,we achieve color-stable blue PeLEDs via a hydrogen-bonded amine-group doping *** guanidine(GA)or formamidinium(FA)as amine-group(-NH_(2))doping source for CsPbBr_(x)Cl_(3-x)quantum dots(QDs),experimental and theoretical results reveal that the strong N-H…X(X=Br/Cl)bonding can be produced between-NH_(2)dopants and Pb-X lattices,thereby increasing the migration barrier of halide ***,color-stable sky-blue devices were realized with emission peaks fixed at 490.5(GA)and 492.5(FA)nm without any obvious shift as the voltage increases,in sharp contrast devices without N-H…X producing a 15 nm red-shift from 487 to 502 *** only that,maximum external quantum efficiency is improved to 3.02%and 4.14%from the initial 1.3%.This finding offers a convenient boulevard to achieve color-stable PeLEDs with high efficiency.