journal article·2021-07-09

High-Brightness Perovskite Light-Emitting Diodes Based on FAPbBr3 Nanocrystals with Rationally Designed Aromatic Ligands

Haifeng Zhao, Hongting Chen, Sai Bai, Chaoyang Kuang, Xiyu Luo, Pengpeng Teng, Chunyang Yin, Peng Zeng, Lintao Hou, Ying Yang, Lian Duan, Feng Gao, Mingzhen Liu

ACS Energy Letters· Volume 6· Issue 7
Publisher page

Abstract

Despite rapid developments of light-emitting diodes (LEDs) based on emerging perovskite nanocrystals (PeNCs), it remains challenging to achieve devices with integrated high efficiencies and high brightness because of the insulating long-chain ligands used for the PeNCs. Herein, we develop highly luminescent and stable formamidinium lead bromide PeNCs capped with rationally designed short aromatic ligands of 2-naphthalenesulfonic acid (NSA) for LEDs. Compared with commonly used oleic acid ligands, the NSA molecules not only preserve the surface properties of the PeNCs during the purification but also notably improve the electrical properties of the assembled emissive layers, ensuring efficient charge injection/transport in the devices. The resulting champion LED with electroluminescence approaching the Rec. 2020 green primary color demonstrates a high brightness of 67 115 cd cm–2 and a peak external quantum efficiency of 19.2%. More impressively, the device shows negligibly decreased efficiency at an elevated brightness of 20 000 cd cm–2 and a well-retained efficiency of over 10% at around 65 000 cd cm–2, presenting a breakthrough in LEDs based on PeNCs.
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Research context

OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · Organic Light-Emitting Diodes Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, People’s Republic of China

Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping SE-58183, Sweden

Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Siyuan Laboratory, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou 510632, People’s Republic of China

State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027, P. R. China

Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, People’s Republic of China

State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, People’s Republic of China

Funding

National Natural Science Foundation of China · Fundamental Research Funds for the Central Universities of China · Guangdong Basic and Applied Basic Research Foundation · Key Projects of Joint Fund of Basic and Applied Basic Research Fund of Guangdong Province · Swedish Research Council Vetenskapsr??det · Swedish Government Strategic Research Area in Materials Science on Functional Materials at Link??ping University · ERC Starting Grant · Key R&D Program of China

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