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Lee, Ho Seung; Noh, Byeongju; Kong, Seong Uk; Hwang, Yong Ha; Cho, Ha-Eun; Jeon, Yongmin; Choi, Kyung Cheol
Npj flexible electronics, 2023, Volume: 7, Issue: 1Journal Article
Increasing demand for real-time healthcare monitoring is leading to advances in thin and flexible optoelectronic device-based wearable pulse oximetry. Most previous studies have used OLEDs for this purpose, but did not consider the side effects of broad full-width half-maximum (FWHM) characteristics and single substrates. In this study, we performed SpO measurement using a fiber-based quantum-dot pulse oximetry (FQPO) system capable of mass production with a transferable encapsulation technique, and a narrow FWHM of about 30 nm. Based on analyses we determined that uniform angular narrow FWHM-based light sources are important for accurate SpO measurements through multi-layer structures and human skin tissues. The FQPO was shown to have improved photoplethysmogram (PPG) signal sensitivity with no waveguide-mode noise signal, as is typically generated when using a single substrate (30-50%). We successfully demonstrate improved SpO measurement accuracy as well as all-in-one clothing-type pulse oximetry with FQPO.
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