DataVXAdvanced MaterialsPaper
journal article·2023-11

Ligand‐Induced Cation–π Interactions Enable High‐Efficiency, Bright, and Spectrally Stable Rec. 2020 Pure‐Red Perovskite Light‐Emitting Diodes

Jibin Zhang, Bo Cai, Xin Zhou, Fanglong Yuan, Chunyang Yin, Heyong Wang, Hongting Chen, Xinzhen Ji, Xiangfei Liang, Chao Shen, Yu Wang, Zhuangzhuang Ma, Jian Qing, Zhifeng Shi, Zhangjun Hu, Lintao Hou, Haibo Zeng, Sai Bai, Feng Gao

Advanced Materials· Volume 35· Issue 45
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Source abstract

Abstract

Abstract Achieving high‐performance perovskite light‐emitting diodes (PeLEDs) with pure‐red electroluminescence for practical applications remains a critical challenge because of the problematic luminescence property and spectral instability of existing emitters. Herein, high‐efficiency Rec. 2020 pure‐red PeLEDs, simultaneously exhibiting exceptional brightness and spectral stability, based on CsPb(Br/I)3 perovskite nanocrystals (NCs) capping with aromatic amino acid ligands featuring cation–π interactions, are reported. It is proven that strong cation–π interactions between the PbI6‐octahedra of perovskite units and the electron‐rich indole ring of tryptophan (TRP) molecules not only chemically polish the imperfect surface sites, but also markedly increase the binding affinity of the ligand molecules, leading to high photoluminescence quantum yields and greatly enhanced spectral stability of the CsPb(Br/I)3 NCs. Moreover, the incorporation of small‐size aromatic TRP ligands ensures superior charge‐transport properties of the assembled emissive layers. The resultant devices emitting at around 635 nm demonstrate a champion external quantum efficiency of 22.8%, a max luminance of 12 910 cd m−2, and outstanding spectral stability, representing one of the best‐performing Rec. 2020 pure‐red PeLEDs achieved so far.
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Research context

NanomaterialsElectronic materials

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

Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics Zhengzhou University Daxue Road 75 Zhengzhou 450052 China

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

MIIT Key Laboratory of Advanced Display Materials and Devices Institute of Optoelectronics & Nanomaterials School of Materials Science and Engineering Nanjing University of Science and Technology 210094 Nanjing China

State Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM) Nanjing University of Posts & Telecommunications (NUPT) Nanjing 210023 China

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

Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu 611731 China

Funding

National Key Research and Development Program of China · National Natural Science Foundation of China

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