Regensburg 2025 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 22: Organic Electronics and Photovoltaics II

CPP 22.4: Talk

Tuesday, March 18, 2025, 14:45–15:00, H38

Efficient room-temperature phosphorescence in small-molecule hosts for applications in information storage — •Yana Bui Thi, 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 organic materials promises unique applications in molecular sensing, bioimaging, and information storage. Typically, RTP is achieved by embedding emitter molecules in a rigid matrix to suppress non-radiative decay. The integration of such emitters into polymer hosts has enabled advancements in photonic technologies, such as programmable luminescent tags. However, a comprehensive understanding of host-guest interactions, particularly with small-molecule hosts suitable for vacuum processing, is widely missing. This work investigates the photophysical properties of RTP emitters embedded in wide bandgap small molecules, typically used in OLEDs. Thin films are fabricated either by spin coating or thermal evaporation, the latter offering superior film quality and compatibility with patterning techniques. RTP can be promoted or impaired depending on the choice of the host material, partially even allowing for RTP in the presence of oxygen. A significant enhancement of photoluminescence can be obtained due to favorable energy transfer from host to emitter. These results highlight the importance of the host selection in optimizing emitter performance and present valuable insights for polymer-free RTP-based photonic devices.

Keywords: Photonics; Sensor; OLED; Evaporation; PLT