SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 32: Molecular Electronics and Excited State Properties (joint session CPP/TT)
TT 32.3: Vortrag
Mittwoch, 29. März 2023, 10:00–10:15, GÖR 226
Multichromophore Macrocycles of Perylene Bisimide Dyes as Fluorescent OLED Emitters — •Björn Ewald1, Ulrich Müller1, Peter Spenst2, Philipp Kagerer1, Theodor Kaiser1, Matthias Stolte2, Frank Würthner2, and Jens Pflaum1 — 1Experimental Physics VI, University of Würzburg, 97074 Würzburg — 2Institut für Organische Chemie and Center for Nanosystems Chemistry, University of Würzburg, 97074 Würzburg
Highly efficient electroluminescence from Organic Light Emitting Diodes (OLEDs) is limited by the non-radiative character of triplet states for conventional fluorophores. While fluorescent emitters benefit from high radiative recombination rates on the order of 109 s−1, they lack from dark triplet states with lifetimes up to several µs or ms. Here we elucidate the potential of perylene bisimide macrocycles as a novel class of fluorescent OLED emitters by applying photon-correlation studies. The correlation experiments unfold additional excitonic relaxation pathways shortening the dark state lifetime for the covalently linked perylene bisimide chromophores. A trimeric chemical design leads to efficient single-photon emission from optically excited thin film samples and even under electrical operation in OLEDs. To the best of our knowledge this is the first indication of electrically-driven single-photon emission from a fluorescent molecule [1]. Therefor we consider our work to constitute an important step towards the design of state-of-the art fluorescent OLED emitters that might also feature a high potential for application in non-calssical single-photon sources.
[1] Ulrich Müller et al., Adv. Optical Mater. 2022, 10, 2200234.