Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 30: Poster: Organic Electronics and Photovoltaics

CPP 30.29: Poster

Dienstag, 8. März 2016, 18:15–21:00, Poster B2

Rational design of thermally activated delayed fluorescence materials: The competition between internal conversion and non-radiative decay processes — •Paul Kleine¹, Ramunas Lygaitis^1,2, Ludwig Popp¹, Florian Wüst¹, Olaf Zeika¹, Simone Lenk¹, Reinhard Scholz¹, and Sebastian Reineke¹ — ¹Institut für Angewandte Photophysik, Technische Universität Dresden, Germany — ²Department of Polymer Chemistry and Technology, Kaunas University of Technology, Lithuania

Under electroluminescence operation, about 75 % of the excitons formed in organic light-emitting diodes (OLEDs) come to life as triplet states. While phosphorescent OLEDs make use of rare metal complexes to increase triplet harvesting, the stability and substantial efficiency roll-off at higher current densities remain open issues. Although there has been an amazing progress in thermally activated delayed fluorescent (TADF) emitters, the overall understanding of the TADF unlocking molecular properties to upconvert tripet states is still in its infancy and the fundamental properties to tackle are still under debate. To increase the internal quantum efficiency of TADF materials, the competition between internal conversion, radiative, and non-radiative rates decides over good and bad emitter molecules. In this talk, we will present our recent efforts in the understanding of the basic concepts of TADF mechanism. Rational design and subsequent photophysical investigations of new types of TADF materials confirm the competition between multiple internal transfer rates which open the path to improved design structures for TADF in general.