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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 28: Poster III

CPP 28.20: Poster

Mittwoch, 20. März 2024, 11:30–13:30, Poster C

Temperature-dependent characterization of TADF OLEDs — •Felix Kübert, Ahmed Mohamed, Johannes Leser, Mona Löther, Vladimir Dyakonov, and Andreas Sperlich — Experimental Physics 6, Julius-Maximilians-Universität Würzburg, 97074 Würzburg, Germany

When injecting charge carriers into the active layer of an OLED, the electrons recombine in S₁ Singlet and T₁ Triplet states at a 1:3 ratio. Third-generation OLEDs, to achieve fluorescence, use the surrounding thermal energy to lift the electrons from the T₁ state up into the S₁ state, where they can then emit fluorescence; so-called Thermally Activated Delayed Fluorescence (TADF). In this study, OLEDs based on ν-DABNA as emitter material will be characterized in a continuous flow optical cryostat in a wide temperature range. For lower temperatures, the thermal energy in the OLEDs is insufficient for the TADF process, resulting in phosphorescence instead of fluorescence. Meanwhile, charge transport by hopping is also temperature-dependent and needs to be considered. Temperature-dependent measurements on OLEDs will therefore shed more light on the TADF process and further the optimization of OLEDs.

Keywords: OLEDs; TADF; Temperature Dependence, Electroluminescence