Suppressing Auger Recombination of Perovskite Quantum Dots for Efficient Pure-Blue-Light-Emitting Diodes

Chenghao Bi; Zhiwei Yao; Jingcong Hu; Xingyu Wang; Mengqi Zhang; Shuyu Tian; Aqiang Liu; Yue Lu; Nora H. de Leeuw; Manling Sui; Jianjun Tian

doi:10.1021/acsenergylett.2c02613

journal article·2023-01-13Open access

Suppressing Auger Recombination of Perovskite Quantum Dots for Efficient Pure-Blue-Light-Emitting Diodes

Chenghao Bi, Zhiwei Yao, Jingcong Hu, Xingyu Wang, Mengqi Zhang, Shuyu Tian, Aqiang Liu, Yue Lu, Nora H. de Leeuw, Manling Sui, Jianjun Tian

ACS Energy Letters· Volume 8· Issue 1

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Source abstract

Abstract

It is a big challenge to achieve pure-blue (≤470 nm) perovskite light-emitting diodes (PeLEDs) with high efficiency and stability. Here, we report pure-blue (electroluminescence at 469 nm) PeLEDs with a full width at half-maximum of 21 nm, high external quantum efficiency of 10.3%, luminance of 12 060 cd m–2, and continuous operation half-life of 25 h, representing the state-of-the-art performance. This design is based on strongly quantum confined CsPbBr3 quantum dots (QDs) with suppression of Auger recombination, which was enabled by inorganic ligands, replacing initial organic ligands on the QDs. The inorganic ligand acts as a “capacitor” to alleviate the charge accumulation and reduce the exciton binding energy of the QDs, which suppresses the Auger recombination, resulting in much lower efficiency roll-off of PeLEDs. Thus, the devices maintain high efficiency (>10%) at high luminance (>2000 cd m–2), which is of considerable significance for the display application.

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Research context

Electronic 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

Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China

Beijing Key Laboratory of Microstructure and Properties of Solids, Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing 100124, China

School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K.

Department of Earth Sciences, Utrecht University, 3584 CB Utrecht, The Netherlands

Shunde Innovation School, University of Science and Technology Beijing, Beijing 100083, China

Funding

Ministry of Science and Technology of the People's Republic of China · Beijing Municipal Commission of Education · Natural Science Foundation of Beijing Municipality · National Natural Science Foundation of China · Guangdong Basic and Applied Basic Research Foundation · Beijing Innovation Team Building Program, China

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