American engineers develop new organic photoelectric sensors in the shape of band-aids

Engineers at the University of California, Berkeley, have developed a new type of organic photoelectric sensor that looks like a band-aid. It can be used as a future health tracker to measure the increase in oxygen in human blood during exercise. Related research results were published in the recently published Nature Communication.

There are various pulse oximeters on the market that measure pulse rate and oxygen saturation levels, but the traditional electronics used in these devices are stiffer and are usually fixed on the fingers or earlobe.

According to a recent report by the physicist organization network, Anna Arias, an associate professor of electrical engineering and computer science at the university, said: "The newly developed organic photoelectric sensor can realize the design switching of silicon and organic or carbon-based materials. People can eventually create a thin, inexpensive and flexible band-aid-like device that can be used while jogging on the track or hiking uphill. The new prototype device is as accurate as the traditional pulse oximeter with the pulse and oxygen readings."

Conventional pulse oximeters typically use red and infrared light from light-emitting diodes (LEDs) to pass through a fingertip or earlobe to detect how much light passes through the other side. Bright, oxygen-rich blood absorbs more red light, while darker, oxygen-poor blood absorbs more infrared light. The ratio of the two wavelengths shows how much oxygen is in the blood.

For organic sensors, the researchers used red and green light to distinguish between red and infrared when distinguishing between high and low levels of oxygen in the blood. Using a solution processing system, the researchers placed green and red organic light-emitting diodes and translucent photodetectors in flexible plastic sheets. By detecting fresh arterial blood flow patterns, the instrument can calculate the pulse.

Arias said: "The study found that it works when measured at different wavelengths; and if it uses unconventional semiconductor materials, it is also working. And, organic electronic instruments are flexible and can easily fit into the body. ”

“Current oximeters are relatively expensive,” she said. “If they are contaminated, medical staff need to sterilize them. By contrast, organic electronics are fairly inexpensive and can be used once like a band-aid.”

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