Berlin 2018 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 71: Organic Electronics and Photovoltaics - OLEDs and Molecular Excitations

CPP 71.3: Vortrag

Donnerstag, 15. März 2018, 15:30–15:45, C 243

Blue emitting TADF Materials for Organic Light Emitting Diodes — •Sebastian Weissenseel¹, Felix Klingert¹, Nikolai Bunzmann¹, Liudmila G. Kudriashova¹, Nikita Drigo², Mohammad Khaja Nazeeruddin², Andreas Sperlich¹, and Vladimir Dyakonov¹ — ¹Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — ²Group for Molecular Engineering of Functional Materials, EPFL, CH-1951 Sion, Switzerland

Since the mechanism of thermally activated delayed fluorescence (TADF) emission was proposed for organic light emitting diodes (OLEDs), the OLED community experienced renewed enthusiasm. The molecular design of TADF materials omits the expensive heavy metal atoms needed for phosphorescence emitters and thus promises a cost reduction and sustainability. Here, we investigate novel blue emitting molecules, which exhibit intramolecular TADF mechanism. OLED devices are analyzed by means of current-electroluminescence-voltage characteristics, emission spectra and external quantum efficiency. We also apply direct spin-sensitive measurements on OLED devices to extract information about the involved spin states and shed some light on the TADF mechanism [1]. This may contribute to an overall better understanding of TADF, which is essential for further improvement of organic light emitting diodes.
S. Vaeth, et al., Adv. Optical Mater. 5, 1600926 (2017).