Dresden 2017 – wissenschaftliches Programm
CPP 50.19: Poster
Mittwoch, 22. März 2017, 18:30–21:00, P3
Synthesis and characterisation of the new emitters for OLED applications — •Ramunas Lygaitis1,2, Olaf Zeika1, Reinhard Scholz1, Ludwig Popp1, Paul Kleine1, Simone Lenk1, and Sebastian Reineke1 — 1Institut für Angewandte Photophysik, Technische Universität Dresden, 01062 Dresden, Deutchland — 2Kaunas University of Technology, Kaunas, Lithuania
Organic light-emitting diodes (OLEDs) are a sustainable, low cost light source used in displays and other applications. Quite big step in progress was made when phosphorescent materials containing Ir(III), Pt(III), or other heavy metals were used in order to harvest both singlet and triplet excitons by means of enhanced intersystem crossing. Today, one of the issues which prevent current iridium-based, phosphorescent emitters widely used in the lighting markets, is that iridium is the fourth rarest naturally-occurring element on the planet, so the usage of this element in large scales could be very risky. Therefore new iridium-free emitters harvesting both singlet and triplet excitons are of big interest. Here, we present the synthesis and characterisation of the series of carbazole-based derivatives containing electron accepting trifluoromethyl groups which support certain intermolecular charge transfer. The newly synthesised derivatives were characterised by means of absorption spectroscopy, steady-state and time-resolved fluorescence spectroscopy, and cyclic voltametry. The collected data prove that our new materials could be regarded as potential TADF emitters as well OLEDs have been prepared with reasonable efficiencies.