Regensburg 2025 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 22: Organic Electronics and Photovoltaics II

CPP 22.3: Talk

Tuesday, March 18, 2025, 14:30–14:45, H38

Systematic variation of acceptor and donor moieties in donor-accerptor-donor small molecules for efficient room-temperature phosphorescence — •Uliana Tsiko, 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

Room-temperature phosphorescence (RTP) from purely organic materials promises unique application in diverse fields including molecular sensing, bioimaging, information storage, and anti-counterfeiting. With the design of programmable luminescent tags (PLTs), we recently reported a novel photonic device architecture that is well suited for various labelling and information exchange applications and even allows a biodegradable design. However, improved RTP emitters are required to fully exploit this technology.

In our contribution, we systematically analyze the impact of the acceptor and donor moieties on the photophysical properties of newly synthesized RTP emitters to gain an understanding of structure-property relationships. While the electron-accepting character does not significantly affect the emission properties, the electron-donating ability of the donor unit can strongly improve RTP emission, leading to pronounced sky-blue phosphorescence in purely organic materials, which has been rarely observed before. These emitters are further characterized in PLTs as a prototypical excitonic application scenario.

Keywords: Organic semiconductors; Luminescence; Photonics; Sensors; Synthesis