Dresden 2026 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster I

CPP 17.12: Poster

Monday, March 9, 2026, 19:00–21:00, P5

Tuning the switching response of purely organic photonic devices by polymer blending — •Jinghan Lin, Sebastian Schellhammer, and Sebastian Reineke — Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute of Applied Physics, Technische Universität Dresden, Dresden, Germany

Programmable luminescent tags (PLTs) provide a promising photonic technology for UV sensing by utilizing the oxygen-sensitivity of room-temperature phosphorescence (RTP) from purely organic emitters [1]. In the emissive layer, the emitter molecules are diluted at low concentration in a rigid polymer host, like Polystyrene (PS) or Poly(methyl methacrylate (PMMA), to reduce photonic loss mechanisms, e.g. triplet-triplet annihilation and non-radiative relaxation. Here, we tailor the microenvironment of RTP emitters and, thus, the photophysical characteristics of the emissive layer by blending different polymers. While the blending of PMMA550k with PS350k led to inhomogeneous films with insufficient photophysical properties, mixing of PS350k with PS40k allows the finetuning of the UV dose required to activate the RTP emission in the PLTs. By combining polymers with different physical characteristics, the local matrix rigidity, oxygen permeability, and intermolecular interactions can be varied in a controlled manner. The study demonstrates how polymer-host engineering provides a systematic route to modulate the characteristics of PLTs while maintaining their key characteristics.

[1] Gmelch et al., Science Advances 2019. aau7310

Keywords: Room Temperature Phosphorescence (RTP); Sensor; Organic Thin Films; Polymer blend; Photonics