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Strong high-energy exciton electroluminescence from the light holes of polytypic quantum dots

Author

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  • Xingzhi Wang

    (University of Science and Technology of China
    University of Science and Technology of China
    University of Science and Technology of China)

  • Yan Gao

    (Henan University)

  • Xiaonan Liu

    (Beijing Institute of Technology)

  • Huaiyu Xu

    (University of Science and Technology of China
    University of Science and Technology of China
    University of Science and Technology of China)

  • Ruixiang Liu

    (University of Science and Technology of China
    University of Science and Technology of China
    University of Science and Technology of China)

  • Jiaojiao Song

    (Henan University)

  • Bo Li

    (University of Science and Technology of China
    University of Science and Technology of China
    University of Science and Technology of China)

  • Huaibin Shen

    (Henan University)

  • Fengjia Fan

    (University of Science and Technology of China
    University of Science and Technology of China
    University of Science and Technology of China)

Abstract

High-energy exciton emission could allow single-component multi-colour display or white light-emitting diodes. However, the thermal relaxation of high-energy excitons is much faster than the photon emission of them, making them non-emissive. Here, we report quantum dots with light hole-heavy hole splitting exhibiting strong high-energy exciton electroluminescence from high-lying light holes, opening a gate for high-performance multi-colour light sources. The high-energy electroluminescence can reach 44.5% of the band-edge heavy-hole exciton emission at an electron flux density Φe of 0.71 × 1019 s−1 cm−2 − 600 times lower than the photon flux density Φp (4.3 × 1021 s−1 cm−2) required for the similar ratio. Our simulation and experimental results suggest that the oscillator strength of heavy holes reduces more than that of light holes under electric fields. We attribute this as the main reason for strong light-hole electroluminescence. We observe this phenomenon in both CdxZn1-xSe-ZnS and CdSe-CdS core-shell quantum dots exhibiting large light hole-heavy hole splittings.

Suggested Citation

  • Xingzhi Wang & Yan Gao & Xiaonan Liu & Huaiyu Xu & Ruixiang Liu & Jiaojiao Song & Bo Li & Huaibin Shen & Fengjia Fan, 2024. "Strong high-energy exciton electroluminescence from the light holes of polytypic quantum dots," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-50432-8
    DOI: 10.1038/s41467-024-50432-8
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    References listed on IDEAS

    as
    1. Junhui Wang & Lifeng Wang & Shuwen Yu & Tao Ding & Dongmei Xiang & Kaifeng Wu, 2021. "Spin blockade and phonon bottleneck for hot electron relaxation observed in n-doped colloidal quantum dots," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    2. Heeyoung Jung & Young-Shin Park & Namyoung Ahn & Jaehoon Lim & Igor Fedin & Clément Livache & Victor I. Klimov, 2022. "Two-band optical gain and ultrabright electroluminescence from colloidal quantum dots at 1000 A cm−2," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    3. Fengjia Fan & Oleksandr Voznyy & Randy P. Sabatini & Kristopher T. Bicanic & Michael M. Adachi & James R. McBride & Kemar R. Reid & Young-Shin Park & Xiyan Li & Ankit Jain & Rafael Quintero-Bermudez &, 2017. "Continuous-wave lasing in colloidal quantum dot solids enabled by facet-selective epitaxy," Nature, Nature, vol. 544(7648), pages 75-79, April.
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