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On the voltage sweep behavior of quantum dot light-emitting diode

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An Erratum to this article was published on 28 September 2023

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Abstract

The origin of the efficiency drop of quantum dot light-emitting diode (QLED) under consecutive voltage sweeps is still a puzzle. In this work, we report the voltage sweep behavior of QLED. We observed the efficiency drop of red QLED with ZnMgO electron transport layer (ETL) under consecutive voltage sweeps. In contrast, the efficiency increases for ZnO ETL device. By analyzing the electrical characteristics of both devices and surface traps of ZnMgO and ZnO nanoparticles, we found the efficiency drop of ZnMgO device is related to the hole leakage mediated by trap state on ZnMgO nanoparticles. For ZnO device, the efficiency raise is due to suppressed electron leakage. The hole leakage also causes rapid lifetime degradation of ZnMgO device. However, the efficiency and lifetime degradation of ZnMgO device can be eliminated with shelf aging. Our work reveals the distinct voltage sweep behavior of QLED based on different ETLs and may help to understand the lifetime degradation mechanism in QLED.

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Acknowledgements

This work was supported by Key-Area Research and Development Program of Guangdong Province (Nos. 2019B010925001 and 2019B010924001), Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting (No. 2017KSYS007).

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Author notes

  1. Xiangwei Qu and Jingrui Ma contributed equally to this work.

Authors and Affiliations

  1. Institute of Nanoscience and Applications, Southern University of Science and Technology, Shenzhen, 518055, China

    Xiangwei Qu, Jingrui Ma, Pai Liu, Kai Wang & Xiao Wei Sun

  2. Key Laboratory of Energy Conversion and Storage Technologies (Southern University of Science and Technology), Ministry of Education, Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting, Guangdong-HongKong-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

    Xiangwei Qu, Jingrui Ma, Pai Liu, Kai Wang & Xiao Wei Sun

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  1. Xiangwei Qu
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Correspondence to Xiao Wei Sun.

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Qu, X., Ma, J., Liu, P. et al. On the voltage sweep behavior of quantum dot light-emitting diode. Nano Res. 16, 5511–5516 (2023). https://doi.org/10.1007/s12274-022-5106-8

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