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High efficiency blue organic light-emitting diodes with below-bandgap electroluminescence

Author

Listed:
  • Maria Vasilopoulou

    (Terma Patriarchou Grigoriou)

  • Abd. Rashid bin Mohd Yusoff

    (Pohang University of Science and Technology (POSTECH))

  • Matyas Daboczi

    (Imperial College London)

  • Julio Conforto

    (Universidade Tecnologica Federal do Parana, GPGEI)

  • Anderson Emanuel Ximim Gavim

    (Universidade Tecnologica Federal do Parana, GPGEI)

  • Wilson Jose Silva

    (Universidade Tecnologica Federal do Parana, GPGEI)

  • Andreia Gerniski Macedo

    (Universidade Tecnologica Federal do Parana, GPGEI)

  • Anastasia Soultati

    (Terma Patriarchou Grigoriou)

  • George Pistolis

    (Terma Patriarchou Grigoriou)

  • Fabio Kurt Schneider

    (Universidade Tecnologica Federal do Parana, GPGEI)

  • Yifan Dong

    (Imperial College London)

  • Polina Jacoutot

    (Imperial College London)

  • Georgios Rotas

    (National and Kapodistrian University of Athens)

  • Jin Jang

    (Kyung Hee University, Dongdaemoon-gu)

  • Georgios C. Vougioukalakis

    (National and Kapodistrian University of Athens)

  • Christos L. Chochos

    (National Hellenic Research Foundation)

  • Ji-Seon Kim

    (Imperial College London)

  • Nicola Gasparini

    (Imperial College London)

Abstract

Blue organic light-emitting diodes require high triplet interlayer materials, which induce large energetic barriers at the interfaces resulting in high device voltages and reduced efficiencies. Here, we alleviate this issue by designing a low triplet energy hole transporting interlayer with high mobility, combined with an interface exciplex that confines excitons at the emissive layer/electron transporting material interface. As a result, blue thermally activated delay fluorescent organic light-emitting diodes with a below-bandgap turn-on voltage of 2.5 V and an external quantum efficiency (EQE) of 41.2% were successfully fabricated. These devices also showed suppressed efficiency roll-off maintaining an EQE of 34.8% at 1000 cd m−2. Our approach paves the way for further progress through exploring alternative device engineering approaches instead of only focusing on the demanding synthesis of organic compounds with complex structures.

Suggested Citation

  • Maria Vasilopoulou & Abd. Rashid bin Mohd Yusoff & Matyas Daboczi & Julio Conforto & Anderson Emanuel Ximim Gavim & Wilson Jose Silva & Andreia Gerniski Macedo & Anastasia Soultati & George Pistolis &, 2021. "High efficiency blue organic light-emitting diodes with below-bandgap electroluminescence," Nature Communications, Nature, vol. 12(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-25135-z
    DOI: 10.1038/s41467-021-25135-z
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    Cited by:

    1. Lei Hua & Yuchao Liu & Binbin Liu & Zhennan Zhao & Lei Zhang & Shouke Yan & Zhongjie Ren, 2022. "Constructing high-efficiency orange-red thermally activated delayed fluorescence emitters by three-dimension molecular engineering," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
    2. Gustavo F. Trindade & Soohwan Sul & Joonghyuk Kim & Rasmus Havelund & Anya Eyres & Sungjun Park & Youngsik Shin & Hye Jin Bae & Young Mo Sung & Lidija Matjacic & Yongsik Jung & Jungyeon Won & Woo Sung, 2023. "Direct identification of interfacial degradation in blue OLEDs using nanoscale chemical depth profiling," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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