Phosphorescence sensor integrates blue OLED for marker excitation

January 29, 2019 //By Julien Happich
Phosphorescence sensor integrates blue OLED for marker excitation
Combining their OLED and light sensors expertise, researchers at Fraunhofer FEP have developed a miniaturized phosphorescence sensor that combines a marker and sensor on very small chip surface, integrated with a blue OLED for marker excitation.

Their first sensor prototype was designed for oxygen ratio monitoring. Most of today’s oxygen ratio monitoring sensors are current-based, they explain, they are difficult to miniaturize and restricted to certain measurement points. In the new sensor, a chemical marker is excited by modulated blue OLED light and the marker’s phosphorescent response is then detected directly inside the sensor chip. Integrating the OLED control and the sensor front-end all on one silicon chip makes this sensor potentially very cheap to manufacture and miniaturize for multiple markers. Barely the size of a thumbnail, the phosphorescence sensor developed so far consists of a blue OLED integrated together with a commercially available marker on the silicon chip.

”Currently, the sensor is designed to detect changes in oxygen level. We have achieved functional verification of the component with this first setup, and can use the miniaturized sensor chip for oxygen measurements in gaseous environments. In addition, we see the sensor chip as a platform for future developments, such as the measurement of further parameters and deployment in other environmental conditions,” explains Dr. Karsten Fehse, project manager in the Organic Microelectronic Devices group.

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