Hydrazide Molecular Configuration Induced Phase Regulation and Defect Passivation Enable Efficient Quasi-2D Blue Perovskite Light-Emitting Diodes

被引:1
作者
Fang, Shuyan [1 ]
Shen, Chao [1 ,2 ]
Tan, Zhi [1 ]
Su, Chenhui [1 ]
Luo, Junquan [1 ]
Wu, Siqi [1 ]
Qing, Jian [1 ]
Luo, Yunhan [2 ]
Yang, Renqiang [3 ]
Zhang, Jibin [4 ]
Hu, Ziyang [5 ]
Liao, Jihai [6 ]
Hou, Lintao [1 ]
机构
[1] Jinan Univ, Guangdong Prov Engn Technol Res Ctr Vacuum Coating, Guangzhou Key Lab Vacuum Coating Technol & New Ene, Coll Phys & Opt Engn, Guangzhou 510632, Peoples R China
[2] Jinan Univ, Coll Phys & Opt Engn, Guangdong Key Lab Opt Fiber Sensing & Commun, Guangzhou 510632, Peoples R China
[3] Jianghan Univ, Sch Optoelect Mat & Technol, Key Lab Optoelect Chem Mat & Devices, Minist Educ, Wuhan 430056, Peoples R China
[4] Zhengzhou Univ, Sch Phys, Key Lab Mat Phys, Minist Educ, Zhengzhou 450001, Peoples R China
[5] Ningbo Univ, Dept Microelect Sci & Engn, Ningbo Collaborat Innovat Ctr Nonlinear Calam Syst, Ningbo 315211, Peoples R China
[6] South China Univ Technol, Dept Phys, Guangzhou 510640, Peoples R China
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
alkyl chain length; blue light-emitting diodes; passivation; phase regulation; quasi-2D perovskite; LARGE-AREA; BRIGHT;
D O I
10.1002/adom.202402996
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Perovskite light-emitting diodes (PeLEDs) have demonstrated significant potential in the display sector, attributed to their wide color gamut, narrow emission spectra, and cost-effectiveness. Despite the rapid advancements in red and green PeLEDs, the attainment of high brightness and high external quantum efficiency (EQE) for blue PeLEDs remains a considerable challenge, which substantially limits their practical applications in white lighting and optical communication. In this study, a method for the passivation of blue quasi-2D perovskites using hydrazide derivatives with varying alkyl chain lengths is presented. Density functional theory analysis indicates that hydrazide derivatives can effectively adsorb onto halogen vacancies, thereby reducing charge trapping states associated with undercoordinated Pb2+. Experimental results demonstrate that the optimal hydrazide derivative can better eliminate non-radiative recombination loss, suppress ions migration, and regulate phase distribution, facilitating smoother energy transfer. Through this approach, stable sky-blue PeLEDs are achieved with an EQE of 14.5% and a maximum luminance of 2659 cd m-2. This work offers a systematic understanding of hydrazide additive design, which will further enhance the performance and stability of blue quasi-2D PeLEDs.
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页数:8
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