Epidermal Bioelectronics Toward Oximetry and Health Care Applications
Cardiovascular diseases are among the most dangerous illnesses to human being, especially to the aged people. Therefore precaution and surveillance of cardiovascular diseases, empowered by prompt diagnosis and treatment of abnormal physiological conditions, have become growingly important and are expected to play essential roles in people’s daily life. In this work, we developed low power photoplethysmogram (PPG) sensing system containing a flexible inorganic LED device and a high-sensitivity, ultra-thin phototransistor to monitor physiological parameters such as heart rate variability and oxygen saturation. The ultra-thin flexible LED and phototransistor overcome the roughness of human skin and allow conformal contact between the devices and the skin surface to realize high signal-to-noise ratio and resistance to motion artifact. The fabrication protocol of the LED and phototransistors will be described, followed by a detailed characterization on the device performance.
This work was in part supported by the Guangdong Innovative Research Team fund in China and the HKSAR Innovation and Technology Commission (ITC) Innovation and Technology Fund (ITF), ITS/111/14.
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