Fiber-based quantum-dot pulse oximetry for wearable health monitoring with high wavelength selectivity and photoplethysmogram sensitivity
- Authors
- Lee, Ho Seung; Noh, Byeongju; Kong, Seong Uk; Hwang, Yong Ha; Cho, Ha-Eun; Jeon, Yongmin; Choi, Kyung Cheol
- Issue Date
- Mar-2023
- Publisher
- NATURE PORTFOLIO
- Citation
- NPJ FLEXIBLE ELECTRONICS, v.7, no.1
- Journal Title
- NPJ FLEXIBLE ELECTRONICS
- Volume
- 7
- Number
- 1
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/87444
- DOI
- 10.1038/s41528-023-00248-1
- ISSN
- 2397-4621
- Abstract
- 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(2) 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(2) 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(2) measurement accuracy as well as all-in-one clothing-type pulse oximetry with FQPO.
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