Improved blue quantum dot light-emitting diodes via chlorine passivated ZnO nanoparticle layer

• Published in: Chinese physics B Vol. 30; no. 11; pp. 118503 - 163
• Main Authors: Qu, Xiangwei, Ma, Jingrui, Jia, Siqi, Wu, Zhenghui, Liu, Pai, Wang, Kai, Sun, Xiao-Wei
• Format: Journal Article
• Language: English
• Published: Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting,Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices,Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting,and Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen 518055,China 01.11.2021; Shenzhen Planck Innovation Technology Pte.Ltd,Liu-He Road,Shenzhen 518173,China; Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting,Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices,Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting,and Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen 518055,China%Key Laboratory of Energy Conversion and Storage Technologies (Ministry of Education),Southern University of Science and Technology,Shenzhen 518055,China; Key Laboratory of Energy Conversion and Storage Technologies (Ministry of Education),Southern University of Science and Technology,Shenzhen 518055,China
• Subjects: chlorine passivation; quantum dot light emitting diodes (QLEDs); electron injection
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/ac22a3

In blue quantum dot light emitting diodes (QLEDs), electron injection is insufficient, which would degrade device efficiency and stability. Herein, we employ chlorine passivated ZnO nanoparticles as electron transport layer to facilitate electron injection into QDs effectively. Moreover, it suppresses exciton quenching at the QD/ZnO interface by blocking charge transfer channel. As a result, the maximum external quantum efficiency of blue QLED was increased from 2.55% to 4.60%, and the operation lifetime of blue QLED was nearly 4 times longer than that of the control device. Our work indicates that election injection plays an important role in blue QLED efficiency and stability.