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Highly efficient light-emitting diodes via self-assembled InP quantum dots

Author

Listed:
  • Hui Li

    (Chinese Academy of Sciences
    University of Science and Technology of China)

  • Jingyuan Zhang

    (Shanxi Datong University)

  • Wen Wen

    (University of Science and Technology of China)

  • Yuyan Zhao

    (University of Science and Technology of China)

  • Hanfei Gao

    (University of Science and Technology of China)

  • Bingqiang Ji

    (Beihang University)

  • Yunjun Wang

    (Ltd. (Mesolight))

  • Lei Jiang

    (Chinese Academy of Sciences
    University of Science and Technology of China)

  • Yuchen Wu

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences (UCAS))

Abstract

Heavy-metal-free quantum dot light-emitting diodes (QLEDs) face commercialization challenges due to low efficiency and poor stability. Spin-coated quantum dot films often create charge leakage areas, limiting device performance. Here, we develop an evaporative-driven self-assembly strategy that enables the preparation of uniform and dense InP-based quantum dot films. During device operation, these films effectively suppress performance degradation caused by charge leakage. QLEDs with uniform and dense InP-based quantum dot films achieve high external quantum efficiency (26.6%) and luminance (1.4 × 105 cd m−2), along with considerable stability (extrapolated T50 lifetime of 4026 hours at 1000 cd m−2). For a 2 × 3 cm2 InP-based device, the peak external quantum efficiency reaches 21.1%. By combining high-performance QLEDs with lithography technology, we fabricate miniaturized QLEDs with a minimum pixel size of 3 μm, achieving a resolution as high as 5080 pixels per inch and a peak external quantum efficiency of 22.6%.

Suggested Citation

  • Hui Li & Jingyuan Zhang & Wen Wen & Yuyan Zhao & Hanfei Gao & Bingqiang Ji & Yunjun Wang & Lei Jiang & Yuchen Wu, 2025. "Highly efficient light-emitting diodes via self-assembled InP quantum dots," Nature Communications, Nature, vol. 16(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-59527-2
    DOI: 10.1038/s41467-025-59527-2
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