Fig. 4: Blood pulse detection of self-powered photoplethysmogram sensors. | Nature Communications

Fig. 4: Blood pulse detection of self-powered photoplethysmogram sensors.

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

Fig. 4

a Schematic diagram describing the operational mechanism of photoplethysmogram (PPG) by polymer light-emitting diode (PLED) and organic photodiode (OPD). b Output voltage characteristics of OPD with PPG measurement. The PLED was powered by 10 series-connected organic photovoltaic (OPV) modules with one-sun illumination from a solar simulator. All devices are on glass substrate. c A photograph of the ultraflexible, self-powered PPG sensor. Scale bar indicates 1 cm. d Output voltage characteristics of OPD with PPG measurement. The PLED was powered by 10 series-connected OPV modules with one-sun illumination from a solar simulator. All devices are on ultraflexible substrate. Blood pulse frequency was calculated to be 77 beats per minute (bpm) from the measurement results.

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