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HL: Fachverband Halbleiterphysik

HL 39: Organic Electronics and Photovoltaics III (joint session CPP/HL)

HL 39.10: Vortrag

Donnerstag, 30. März 2023, 12:00–12:15, GÖR 226

Design of All-Organic Oxygen Sensors — •Toni Bärschneider and Sebastian Reineke — Dresden Integrated Cen- ter for Applied Physics and Photonic Materials (IAPP), Technische Universität Dresden

Organic electronic devices, such as light-emitting diodes (OLEDs) and photodetectors (OPDs), are ideal for sensor applications because of their versatility and flexibility. Additionally, they can be easily fabricated on any substrate, making integrated sensor applications possible. This allows for easy miniaturization and cheap fabrication. Organic room temperature phosphorescence (RTP) materials are well suited for optical oxygen sensing because of their strong oxygen dependency.

In this work, we developed a monolithic all-organic oxygen sensor composed of a RTP sensing layer, an ultraviolet OLED as an excitation source, and a narrow bandwidth OPD for detection. The RTP sensing layer simultaneously shows fluorescence and phosphorescence at room temperature, which enables self-referencing to avoid photodegradation-caused distortion. Due to the long phosphorescence lifetime, sensing within the ultra-trace range is possible.

The presented sensors overcome drawbacks of current optical oxygen sensors, such as complexity, expensive read-out electronics, and a lack of possible miniaturization.