Researchers from the Fraunhofer FEP Institute developed a miniaturized OLED-on-silicon based phosphorescence sensor. Such sensors are used today typically for oxygen concentration measurement. The researchers say that this technology enables a small-sized sensor that offers a fast and precise evaluation. In the future such sensors could be produced at a relatively low cost.
The new sensor is based on a chemical marker that is excited by modulated blue OLED light. The phosphorescent response of the marker is then detected directly inside the sensor chip. The OLED device is 4.7 x 2.2 mm in size. The researchers hope to be able to reduce the size of the entire chip down to 2 x 2 mm.