研究目的
Developing a high-accuracy photoplethysmography array using near-infrared organic photodiodes with ultralow dark current for mapping blood pulsation and oxygenation beyond traditional sensing locations.
研究成果
The developed 16 × 16 OPD pixel array demonstrates potential for high-quality PPG measurements and pulse oximetry, with insights into artery stiffness and blood circulation quality. The array's pixelated nature allows for signal quality improvement through post-processing, offering clinical value in skin health assessments.
研究不足
The study acknowledges the lower EQE of the OPDs due to the absorption of NIR radiation by the Ag top electrode and the potential for improvement by replacing Ag with a transparent ITO top electrode.
1：Experimental Design and Method Selection:
The study developed a 16 × 16 OPD pixel array for PPG measurements, focusing on NIR sensitivity and low dark current density.
2：Sample Selection and Data Sources:
The OPD array was fabricated using solution-processed NIR-sensitive OPDs based on PDPP3T blended with PC61BM.
3：List of Experimental Equipment and Materials:
Equipment included a probe station, EQE setup with a tungsten–halogen lamp, monochromator, pre-amplifier, and lock-in amplifier. Materials included PDPP3T, PC61BM, MoOx, and Ag.
4：Experimental Procedures and Operational Workflow:
The OPD array was characterized for photocurrent measurements, EQE, and photocurrent transients. PPG signals were acquired using an LED array of different wavelengths.
5：Data Analysis Methods:
PPG signals were filtered and analyzed to assess artery stiffness and blood circulation quality.
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