Regensburg 2025 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 30: Emerging Topics in Chemical and Polymer Physics, New Instruments and Methods I

CPP 30.4: Talk

Wednesday, March 19, 2025, 17:15–17:30, H34

Imaging techniques for characterization of organic photonic devices utilizing digital luminescence — •Sebastian Kaiser, Sebastian Schellhammer, and Sebastian Reineke — Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics, Technische Universität Dresden

The generally spin-forbidden T1-S0 transition of organic molecules gives access to pronounced long-lived room temperature phosphorescence in surprisingly many molecules, but is easily quenched by environmental oxygen. Controlling and utilizing these competing processes has led to the development of digital luminescence as a photonic design principle and its usage in programmable luminescent tags (PLTs) for application in sensing and information storage. To study and utilize this persistent luminescence, a spatially and temporal resolved imaging technique allows us to extend the characterization of these phenomena beyond spectroscopic measurements. By analyzing high-resolution images, differences in intensity and activation time within a single PLT can be detected, allowing conclusions as to structural irregularities. Evaluating each pixel individually also provides great insight into the statistical distribution of these values without the extensive need for samples and measurements. Thus, imaging techniques offer an excellent extension to the characterization of material systems for digital luminescence and by that allowing us to understand and optimize structure-property relationships. This represents an important step towards the use of PLTs for information storage and exchange.

Keywords: Photonics; Sensor; Organic Semiconductor; Phosphorescence; Organic Electronics