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Ultrabright and stable top-emitting quantum-dot light-emitting diodes with negligible angular color shift

Author

Listed:
  • Mengqi Li

    (Soochow University)

  • Rui Li

    (Soochow University)

  • Longjia Wu

    (Nanshan District)

  • Xiongfeng Lin

    (Nanshan District)

  • Xueqing Xia

    (Soochow University)

  • Zitong Ao

    (Nanshan District)

  • Xiaojuan Sun

    (Soochow University)

  • Xingtong Chen

    (Soochow University)

  • Song Chen

    (Soochow University
    Soochow University)

Abstract

Top emission can enhance luminance, color purity, and panel-manufacturing compatibility for emissive displays. Still, top-emitting quantum-dot light-emitting diodes (QLEDs) suffer from poor stability, low light outcoupling, and non-negligible viewing-angle dependence because, for QLEDs with non-red emission, the electrically optimum device structure is incompatible with single-mode optical microcavity. Here, we demonstrate that by improving the way of determining reflection penetration depths and creating refractive-index-lowering processes, the issues faced by green QLEDs can be overcome. This leads to advanced device performance, including a luminance exceeding 1.6 million nits, a current efficiency of 204.2 cd A−1, and a T95 operational lifetime of 15,600 hours at 1000 nits. Meanwhile, our design does not compromise light outcoupling as it offers an external quantum efficiency of 29.2% without implementing light extraction methods. Lastly, an angular color shift of Δu’v’ = 0.0052 from 0° to 60° is achieved by narrowing the emission linewidth of quantum dots.

Suggested Citation

  • Mengqi Li & Rui Li & Longjia Wu & Xiongfeng Lin & Xueqing Xia & Zitong Ao & Xiaojuan Sun & Xingtong Chen & Song Chen, 2024. "Ultrabright and stable top-emitting quantum-dot light-emitting diodes with negligible angular color shift," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-49574-6
    DOI: 10.1038/s41467-024-49574-6
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    References listed on IDEAS

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    1. Xingtong Chen & Xiongfeng Lin & Likuan Zhou & Xiaojuan Sun & Rui Li & Mengyu Chen & Yixing Yang & Wenjun Hou & Longjia Wu & Weiran Cao & Xin Zhang & Xiaolin Yan & Song Chen, 2023. "Blue light-emitting diodes based on colloidal quantum dots with reduced surface-bulk coupling," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
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