High-Quality Photoplethysmography Signal Enabled by Narrowband Red Phosphor Converted Light-Emitting Diodes for Accurate Blood-Pressure Monitoring
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Photoplethysmography (PPG) is widely used for noninvasive cardiovascular monitoring, yet raw-signal quality is often limited by the broadband emission and thermal spectral drift of conventional red LEDs, increasing reliance on complex downstream processing. He... ...
