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Unravelling the electron injection/transport mechanism in organic light-emitting diodes

Author

Listed:
  • Tsubasa Sasaki

    (Japan Broadcasting Corporation (NHK), Science & Technology Research Laboratories)

  • Munehiro Hasegawa

    (Nippon Shokubai Co., Ltd.)

  • Kaito Inagaki

    (Tokyo University of Science)

  • Hirokazu Ito

    (Tokyo University of Science)

  • Kazuma Suzuki

    (Tokyo University of Science)

  • Taku Oono

    (Japan Broadcasting Corporation (NHK), Science & Technology Research Laboratories)

  • Katsuyuki Morii

    (Nippon Shokubai Co., Ltd.
    Osaka University)

  • Takahisa Shimizu

    (Japan Broadcasting Corporation (NHK), Science & Technology Research Laboratories)

  • Hirohiko Fukagawa

    (Japan Broadcasting Corporation (NHK), Science & Technology Research Laboratories)

Abstract

Although significant progress has been made in the development of light-emitting materials for organic light-emitting diodes along with the elucidation of emission mechanisms, the electron injection/transport mechanism remains unclear, and the materials used for electron injection/transport have been basically unchanged for more than 20 years. Here, we unravelled the electron injection/transport mechanism by tuning the work function near the cathode to about 2.0 eV using a superbase. This extremely low-work function cathode allows direct electron injection into various materials, and it was found that organic materials can transport electrons independently of their molecular structure. On the basis of these findings, we have realised a simply structured blue organic light-emitting diode with an operational lifetime of more than 1,000,000 hours. Unravelling the electron injection/transport mechanism, as reported in this paper, not only greatly increases the choice of materials to be used for devices, but also allows simple device structures.

Suggested Citation

  • Tsubasa Sasaki & Munehiro Hasegawa & Kaito Inagaki & Hirokazu Ito & Kazuma Suzuki & Taku Oono & Katsuyuki Morii & Takahisa Shimizu & Hirohiko Fukagawa, 2021. "Unravelling the electron injection/transport mechanism in organic light-emitting diodes," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-23067-2
    DOI: 10.1038/s41467-021-23067-2
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    Cited by:

    1. Seiichiro Izawa & Masahiro Morimoto & Keisuke Fujimoto & Koki Banno & Yutaka Majima & Masaki Takahashi & Shigeki Naka & Masahiro Hiramoto, 2023. "Blue organic light-emitting diode with a turn-on voltage of 1.47 V," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    2. Ziyang Liu & Xiao Li & Yang Lu & Chen Zhang & Yuewei Zhang & Tianyu Huang & Dongdong Zhang & Lian Duan, 2022. "In situ-formed tetrahedrally coordinated double-helical metal complexes for improved coordination-activated n-doping," Nature Communications, Nature, vol. 13(1), pages 1-11, December.

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