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Self-powered ultraflexible photonic skin for continuous bio-signal detection via air-operation-stable polymer light-emitting diodes

Author

Listed:
  • Hiroaki Jinno

    (The University of Tokyo
    RIKEN
    Nanomaterials Engineering Research Group, ETH zürich)

  • Tomoyuki Yokota

    (The University of Tokyo)

  • Mari Koizumi

    (The University of Tokyo)

  • Wakako Yukita

    (The University of Tokyo)

  • Masahiko Saito

    (Hiroshima University)

  • Itaru Osaka

    (Hiroshima University)

  • Kenjiro Fukuda

    (RIKEN
    RIKEN)

  • Takao Someya

    (The University of Tokyo
    RIKEN
    RIKEN)

Abstract

Ultraflexible optical devices have been used extensively in next-generation wearable electronics owing to their excellent conformability to human skins. Long-term health monitoring also requires the integration of ultraflexible optical devices with an energy-harvesting power source; to make devices self-powered. However, system-level integration of ultraflexible optical sensors with power sources is challenging because of insufficient air operational stability of ultraflexible polymer light-emitting diodes. Here we develop an ultraflexible self-powered organic optical system for photoplethysmogram monitoring by combining air-operation-stable polymer light-emitting diodes, organic solar cells, and organic photodetectors. Adopting an inverted structure and a doped polyethylenimine ethoxylated layer, ultraflexible polymer light-emitting diodes retain 70% of the initial luminance even after 11.3 h of operation under air. Also, integrated optical sensors exhibit a high linearity with the light intensity exponent of 0.98 by polymer light-emitting diode. Such self-powered, ultraflexible photoplethysmogram sensors perform monitoring of blood pulse signals as 77 beats per minute.

Suggested Citation

  • Hiroaki Jinno & Tomoyuki Yokota & Mari Koizumi & Wakako Yukita & Masahiko Saito & Itaru Osaka & Kenjiro Fukuda & Takao Someya, 2021. "Self-powered ultraflexible photonic skin for continuous bio-signal detection via air-operation-stable polymer light-emitting diodes," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-22558-6
    DOI: 10.1038/s41467-021-22558-6
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