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Visualizing electroluminescence process in light-emitting electrochemical cells

Author

Listed:
  • Kosuke Yasuji

    (Osaka Metropolitan University)

  • Tomo Sakanoue

    (Nippon Chemical Industrial Co., Ltd.)

  • Fumihiro Yonekawa

    (Nippon Chemical Industrial Co., Ltd.)

  • Katsuichi Kanemoto

    (Osaka Metropolitan University
    Osaka Metropolitan University)

Abstract

Electroluminescence occurs via recombination reactions between electrons and holes, but these processes have not been directly evaluated. Here, we explore the operation dynamics of ionic liquid-based light-emitting electrochemical cells (LECs) with stable electroluminescence by multi-timescale spectroscopic measurements synchronized with the device operation. Bias-modulation spectroscopy, measuring spectral responses to modulated biases, reveals the bias-dependent behavior of p-doped layers varying from growth to saturation and to recession. The operation dynamics of the LEC is directly visualized by time-resolved bias-modulation spectra, revealing the following findings. Electron injection occurs more slowly than hole injection, causing delay of electroluminescence with respect to the p-doping. N-doping proceeds as the well-grown p-doped layer recedes, which occur while the electroluminescence intensity remains constant. With the growth of n-doped layer, hole injection is reduced due to charge balance, leading to hole-accumulation on the anode, after which LEC operation reaches equilibrium. These spectroscopic techniques are widely applicable to explore the dynamics of electroluminescence-devices.

Suggested Citation

  • Kosuke Yasuji & Tomo Sakanoue & Fumihiro Yonekawa & Katsuichi Kanemoto, 2023. "Visualizing electroluminescence process in light-emitting electrochemical cells," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-36472-6
    DOI: 10.1038/s41467-023-36472-6
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    3. Shi Tang & Andreas Sandström & Petter Lundberg & Thomas Lanz & Christian Larsen & Stephan Reenen & Martijn Kemerink & Ludvig Edman, 2017. "Design rules for light-emitting electrochemical cells delivering bright luminance at 27.5 percent external quantum efficiency," Nature Communications, Nature, vol. 8(1), pages 1-9, December.
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