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Research Article

Effect and mechanism of encapsulation on aging characteristics of quantum-dot light-emitting diodes

Zinan Chen1, Qiang Su1, Zhiyuan Qin1, Shuming Chen1,2( )
Guangdong University Key Lab for Advanced Quantum Dot Displays and Lighting, Shenzhen Key Lab 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 (Southern University of Science and Technology), Ministry of Education, Shenzhen 518055, China
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Abstract

The aging characteristics, e.g., the evolution of efficiency and luminance of quantum-dot light-emitting diodes (QLEDs) are greatly affected by the encapsulation. When encapsulated with ultraviolet curable resin, the efficiency is increased over time, a known phenomenon termed as positive aging which remains one of the unsolved mysteries. By developing a physical model and an analytical model, we identify that the efficiency improvement is mainly attributed to the suppression of hole leakage current that is resulted from the passivation of ZnMgO defects. When further encapsulated with desiccant, the positive aging effect vanishes. To fully take the advantage of positive aging, the desiccant is incorporated after the positive aging process is completed. With the new encapsulation method, the QLED exhibits a high external quantum efficiency of 20.19% and a half lifetime of 1,267 h at an initial luminance of 2,800 cd·m-2, which are improved by 1.4 and 6.0 folds, respectively, making it one of the best performing devices. Our work provides an in-depth and systematic understanding of the mechanism of positive aging and offers a practical encapsulation way for realizing efficient and stable QLEDs.

Keywords

encapsulationlight-emitting diodesquantum-dotpositive agingZnO defects

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Nano Research
Volume 14 Issue 1,
January 2021
Pages 320-327
DOI: 10.1007/s12274-020-3091-3
Cite this article:
Chen Z, Su Q, Qin Z, et al. Effect and mechanism of encapsulation on aging characteristics of quantum-dot light-emitting diodes. Nano Research, 2021, 14(1): 320-327. https://doi.org/10.1007/s12274-020-3091-3
Topics:
LuminanceMagnesium compoundsNanocrystalsOrganic light emitting diodes (OLED) Semiconductor quantum dotsZinc compounds

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Received: 13 July 2020
Revised: 04 September 2020
Accepted: 05 September 2020
Published: 05 January 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature
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