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The role of photon recycling in perovskite light-emitting diodes

Author

Listed:
  • Changsoon Cho

    (University of Cambridge, J.J. Thomson Avenue
    Korea Advanced Institute of Science and Technology (KAIST)
    Technische Universität Dresden)

  • Baodan Zhao

    (University of Cambridge, J.J. Thomson Avenue
    Zhejiang University)

  • Gregory D. Tainter

    (University of Cambridge, J.J. Thomson Avenue)

  • Jung-Yong Lee

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

  • Richard H. Friend

    (University of Cambridge, J.J. Thomson Avenue)

  • Dawei Di

    (University of Cambridge, J.J. Thomson Avenue
    Zhejiang University)

  • Felix Deschler

    (University of Cambridge, J.J. Thomson Avenue
    Technische Universität München)

  • Neil C. Greenham

    (University of Cambridge, J.J. Thomson Avenue)

Abstract

Perovskite light-emitting diodes have recently broken the 20% barrier for external quantum efficiency. These values cannot be explained with classical models for optical outcoupling. Here, we analyse the role of photon recycling (PR) in assisting light extraction from perovskite light-emitting diodes. Spatially-resolved photoluminescence and electroluminescence measurements combined with optical modelling show that repetitive re-absorption and re-emission of photons trapped in substrate and waveguide modes significantly enhance light extraction when the radiation efficiency is sufficiently high. In this manner, PR can contribute more than 70% to the overall emission, in agreement with recently-reported high efficiencies. While an outcoupling efficiency of 100% is theoretically possible with PR, parasitic absorption losses due to absorption from the electrodes are shown to limit practical efficiencies in current device architectures. To overcome the present limits, we propose a future configuration with a reduced injection electrode area to drive the efficiency toward 100%.

Suggested Citation

  • Changsoon Cho & Baodan Zhao & Gregory D. Tainter & Jung-Yong Lee & Richard H. Friend & Dawei Di & Felix Deschler & Neil C. Greenham, 2020. "The role of photon recycling in perovskite light-emitting diodes," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-14401-1
    DOI: 10.1038/s41467-020-14401-1
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    Cited by:

    1. Sudhir Kumar & Tommaso Marcato & Frank Krumeich & Yen-Ting Li & Yu-Cheng Chiu & Chih-Jen Shih, 2022. "Anisotropic nanocrystal superlattices overcoming intrinsic light outcoupling efficiency limit in perovskite quantum dot light-emitting diodes," Nature Communications, Nature, vol. 13(1), pages 1-10, December.

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