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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster Session I

CPP 17.10: Poster

Montag, 27. März 2023, 18:00–20:00, P3

Multichromophore Macrocycles of Perylene Bisimide Dyes as Fluorescent OLED Emitters — •Theodor Kaiser¹, Björn Ewald¹, Ulrich Müller¹, Peter Spest², Mathhias Stolte², Frank Würthner², and Jens Pflaum¹ — ¹Experimental Physics VI, University of Würzburg — ²Institut für Organische Chemie and Center for Nanosystems Chemistry, University of Würzburg

While fluorescent organic emitters exhibit an efficient and bright singlet decay their efficiency in Organic Light Emitting Diodes (OLEDs) is limited by the lifetime and non-radiative loss pathway of triplet dark states. Therefore OLED applications are mainly based on phosphorescent emitters harvesting triplet excitons for light emission. In order to increase the efficiency of fluorescent OLEDs we present a novel approach for the chemical design of fluorescent emitters based on multichromophore macrocycles of perylene bisimide dyes (PBIs). By linking individual PBI chromophores in macrocyclic architectures, biexcitonic coupling can lead to an efficient transformation of triplet dark states by processes like triplet-triplet annihilation (TTA). This allows for an efficient bright electrical operation in OLED devices as the lifetime of dark states is drastically reduced. As recently reported by our groups trimeric perlyene bisimides can even produce non-classical electrically driven single photon emission at room temperature [1], which has so far only been reported for phosphorescent emitters. Therefore these emitters offer new options for the application of strictly fluorescent materials in classical and non-classical OLED devices.

[1] Ulrich Müller et al.,Adv. Optical Mater 2022, 10, 2200234.