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Synergetic electrode architecture for efficient graphene-based flexible organic light-emitting diodes

Author

Listed:
  • Jaeho Lee

    (School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST)
    Graphene Research Center, KI for Nanocentury, KAIST)

  • Tae-Hee Han

    (Pohang University of Science and Technology (POSTECH))

  • Min-Ho Park

    (Pohang University of Science and Technology (POSTECH))

  • Dae Yool Jung

    (School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST)
    Graphene Research Center, KI for Nanocentury, KAIST)

  • Jeongmin Seo

    (KAIST)

  • Hong-Kyu Seo

    (Pohang University of Science and Technology (POSTECH))

  • Hyunsu Cho

    (School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST)
    Graphene Research Center, KI for Nanocentury, KAIST
    Present address: Electronics and Telecommunications Research Institute (ETRI), Daejeon 305-700, Republic of Korea.)

  • Eunhye Kim

    (School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST)
    Graphene Research Center, KI for Nanocentury, KAIST)

  • Jin Chung

    (School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST)
    Graphene Research Center, KI for Nanocentury, KAIST)

  • Sung-Yool Choi

    (School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST)
    Graphene Research Center, KI for Nanocentury, KAIST)

  • Taek-Soo Kim

    (KAIST)

  • Tae-Woo Lee

    (Pohang University of Science and Technology (POSTECH))

  • Seunghyup Yoo

    (School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST)
    Graphene Research Center, KI for Nanocentury, KAIST)

Abstract

Graphene-based organic light-emitting diodes (OLEDs) have recently emerged as a key element essential in next-generation displays and lighting, mainly due to their promise for highly flexible light sources. However, their efficiency has been, at best, similar to that of conventional, indium tin oxide-based counterparts. We here propose an ideal electrode structure based on a synergetic interplay of high-index TiO2 layers and low-index hole-injection layers sandwiching graphene electrodes, which results in an ideal situation where enhancement by cavity resonance is maximized yet loss to surface plasmon polariton is mitigated. The proposed approach leads to OLEDs exhibiting ultrahigh external quantum efficiency of 40.8 and 62.1% (64.7 and 103% with a half-ball lens) for single- and multi-junction devices, respectively. The OLEDs made on plastics with those electrodes are repeatedly bendable at a radius of 2.3 mm, partly due to the TiO2 layers withstanding flexural strain up to 4% via crack-deflection toughening.

Suggested Citation

  • Jaeho Lee & Tae-Hee Han & Min-Ho Park & Dae Yool Jung & Jeongmin Seo & Hong-Kyu Seo & Hyunsu Cho & Eunhye Kim & Jin Chung & Sung-Yool Choi & Taek-Soo Kim & Tae-Woo Lee & Seunghyup Yoo, 2016. "Synergetic electrode architecture for efficient graphene-based flexible organic light-emitting diodes," Nature Communications, Nature, vol. 7(1), pages 1-9, September.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11791
    DOI: 10.1038/ncomms11791
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