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Lensfree OLEDs with over 50% external quantum efficiency via external scattering and horizontally oriented emitters

Author

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  • Jinouk Song

    (Korea Advanced Institute of Science and Technology (KAIST))

  • Kwon-Hyeon Kim

    (Seoul National University)

  • Eunhye Kim

    (Korea Advanced Institute of Science and Technology (KAIST))

  • Chang-Ki Moon

    (Seoul National University)

  • Yun-Hi Kim

    (Gyeongsang National University)

  • Jang-Joo Kim

    (Seoul National University)

  • Seunghyup Yoo

    (Korea Advanced Institute of Science and Technology (KAIST))

Abstract

High efficiency is important for successful deployment of any light sources. Continued efforts have recently made it possible to demonstrate organic light-emitting diodes with efficiency comparable to that of inorganic light-emitting diodes. However, such achievements were possible only with the help of a macroscopic lens or complex internal nanostructures, both of which undermine the key benefits of organic light-emitting diodes as an affordable planar light source. Here we present a systematic way to achieve organic light-emitting diodes with ultrahigh efficiency even only with an external scattering film, one of the simplest low-cost outcoupling structures. Through a global, multivariable analysis, we show that scattering with a high degree of forwardness has a potential to play a critical role in realizing ultimate efficiency. Combined with horizontally oriented emitters, organic light-emitting diodes equipped with particle-embedded films tailored for forward-intensive scattering achieve a maximum external quantum efficiency of 56%.

Suggested Citation

  • Jinouk Song & Kwon-Hyeon Kim & Eunhye Kim & Chang-Ki Moon & Yun-Hi Kim & Jang-Joo Kim & Seunghyup Yoo, 2018. "Lensfree OLEDs with over 50% external quantum efficiency via external scattering and horizontally oriented emitters," Nature Communications, Nature, vol. 9(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-05671-x
    DOI: 10.1038/s41467-018-05671-x
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