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HL: Fachverband Halbleiterphysik

HL 26: Poster II

HL 26.17: Poster

Mittwoch, 11. März 2026, 09:30–11:30, P1

Flexible OLED-OPD System in a Rolled Geometry for Angle-Resolved Optical Sensing — •Shujun Pei, Jan Schardt, Markus Köpke, and Martina Gerken — Chair for Integrated Systems and Photonics, Faculty of Engineering, Kiel University, Kiel, Germany

We investigate an integrated sensing platform combining an organic light-emitting diode (OLED) and multiple organic photodetector (OPD) pixels fabricated on a single flexible PET substrate. After fabrication, the substrate is rolled manually such that the OLED and OPDs face each other across the inner circumference of a cylindrical channel. This geometry enables angle-dependent optical paths through fluids flowing inside the tube, providing a basis for reconstructing absorption and scattering profiles relevant for chemical and biomedical sensing.

To independently assess OLED-OPD performance, devices were characterized on separate flat substrates. OPD responsivity was quantified using a calibrated LED solar simulator and direct OLED illumination. Distance-dependent photocurrent measurements reveal the expected decay consistent with Lambertian emission and simple geometric coupling between the OLED and OPD pixels. Numerical modeling, including finite emitter and detector areas as well as realistic alignment offsets, closely reproduces the measured photocurrent trends.

These results demonstrate the feasibility of compact, flexible OLED-OPD assemblies for multi-angle optical sensing and provide a foundation for future device refinement.

Keywords: Flexible Organic Optoelectronics; Angle-Resolved Optical Sensing; OLED-OPD Integration; Cylindrical Optical Geometry