Berlin 2024 – scientific programme

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DS: Fachverband Dünne Schichten

DS 18: Optical Analysis of Organic Thin Films

DS 18.1: Talk

Thursday, March 21, 2024, 17:00–17:15, A 060

The Impact of solution processing on the optoelectronic properties of TADF emitters — •Anatolii Kuimov, Rishabh Saxena, Sergey Bagnich, and Anna Köhler — University of Bayreuth, Bayreuth, Gemany

Thermally Activated Delayed Fluorescence (TADF) emitters are crucial for achieving 100% efficiency in OLEDs, utilizing reverse intersystem crossing (RISC) to convert non-emissive triplet states into highly emissive singlet states. Our study focuses on DMAC-TRZ, showcasing promising TADF properties in diverse configurations. We explored film processing's impact on photophysical parameters and RISC rates.

Post-processing, involving temperature and solution treatments, proved instrumental in fine-tuning the RISC rate and enhancing the film's ordering* one of the pivotal factors in the photophysics of TADF materials. Moreover, our experiments on DMAC-TRZ films revealed these processes' surprising capability to adjust both parameters significantly. Additionally, the investigation demonstrated that the glass transition temperature of the emitter is less significant compared to the material's melting point during temperature annealing.

In conclusion, film processing and post-processing methodologies effectively improved film ordering and precisely adjusted RISC rates. These adjustments are critical for optimizing OLED efficiency.

This work was funded by the European Union

Keywords: Optical spectroscopy; Optoelectronic properties; TADF emmiters; Transient PL; Fluorescense