Abstract
This paper demonstrated a new design structure for minimizing the power consumption of a pulse meter. Monolithic devices composed of a red (625 nm) organic light-emitting diode (OLED) and an organic photodiode (OPD) were fabricated on the same substrate. Two organic devices were designed differently. One had a circle-shaped OLED in the center of the device and was surrounded by the OPD, while the other had the opposite structure. The external quantum efficiency (EQE) of the OLED and the OPD were 7% and 37%, respectively. We evaluated and compared the signal-to-noise ratio (SNR) of the photoplethysmogram (PPG) signal on different parts of the body and successfully acquired clear PPG signals at those positions, where the best signal was obtained from the fingertip at a SNR of about 62 dB. The proposed organic pulse meter sensor was operated successfully with a power consumption of 0.1 mW. Eventually, the proposed organic biosensor reduced the power consumption and improved the capability of the pulse meter for long-term use.
Highlights
Wearable health-monitoring devices can promote public health by facilitating a person’s health assessment based on their personal vital signs
The signals were obtained portable pulse meter was attached to the index finger to acquire the and from the same subject for a specific time period while he was resting in a chair
On the other hand, designing an effective organic light-emitting diode (OLED) and organic photodiode (OPD) structure guided by optical simulation led to the best hand, designing an effective OLED and OPD structure guided by optical simulation led to the best result in terms of power consumption and signal quality
Summary
Wearable health-monitoring devices can promote public health by facilitating a person’s health assessment based on their personal vital signs. Wearable medical devices have been developed to constantly monitor human performance both comfortably and noninvasively [3,4]. These devices have different forms and target different healthy people or patients based on biosensors such as portable electrocardiogram (ECG) [5], cuff-less blood pressure measurement [6], wearable devices for the diagnosis and therapy of movement disorders [7]. There are still some issues with these kinds of pulse meters that need to be improved in areas such as power consumption, signal quality, and the flexibility of the device.
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