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Fiber-based quantum-dot pulse oximetry for wearable health monitoring with high wavelength selectivity and photoplethysmogram sensitivity.

Ho Seung LeeByeongju NohSeong Uk KongYong Ha HwangHa-Eun ChoYongmin JeonKyung Cheol Choi
Published in: Npj flexible electronics (2023)
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.
Keyphrases
  • healthcare
  • blood pressure
  • heart rate
  • high resolution
  • public health
  • gene expression
  • health information
  • photodynamic therapy
  • structural basis
  • human health