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Efficient and bright organic light-emitting diodes on single-layer graphene electrodes

Author

Listed:
  • Ning Li

    (IBM T.J. Watson Research Center)

  • Satoshi Oida

    (IBM T.J. Watson Research Center)

  • George S. Tulevski

    (IBM T.J. Watson Research Center)

  • Shu-Jen Han

    (IBM T.J. Watson Research Center)

  • James B. Hannon

    (IBM T.J. Watson Research Center)

  • Devendra K. Sadana

    (IBM T.J. Watson Research Center)

  • Tze-Chiang Chen

    (IBM T.J. Watson Research Center)

Abstract

Organic light-emitting diodes are emerging as leading technologies for both high quality display and lighting. However, the transparent conductive electrode used in the current organic light-emitting diode technologies increases the overall cost and has limited bendability for future flexible applications. Here we use single-layer graphene as an alternative flexible transparent conductor, yielding white organic light-emitting diodes with brightness and efficiency sufficient for general lighting. The performance improvement is attributed to the device structure, which allows direct hole injection from the single-layer graphene anode into the light-emitting layers, reducing carrier trapping induced efficiency roll-off. By employing a light out-coupling structure, phosphorescent green organic light-emitting diodes exhibit external quantum efficiency >60%, while phosphorescent white organic light-emitting diodes exhibit external quantum efficiency >45% at 10,000 cd m−2 with colour rendering index of 85. The power efficiency of white organic light-emitting diodes reaches 80 lm W−1 at 3,000 cd m−2, comparable to the most efficient lighting technologies.

Suggested Citation

  • Ning Li & Satoshi Oida & George S. Tulevski & Shu-Jen Han & James B. Hannon & Devendra K. Sadana & Tze-Chiang Chen, 2013. "Efficient and bright organic light-emitting diodes on single-layer graphene electrodes," Nature Communications, Nature, vol. 4(1), pages 1-7, October.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3294
    DOI: 10.1038/ncomms3294
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