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

Hiroaki Jinno, Tomoyuki Yokota, Mari Koizumi, Wakako Yukita, Masahiko Saito, Itaru Osaka, Kenjiro Fukuda and Takao Someya ()
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Hiroaki Jinno: The University of Tokyo
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
Takao Someya: The University of Tokyo

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: 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.

Date: 2021
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DOI: 10.1038/s41467-021-22558-6

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