title: Effect of Conjugation Pathway in Metal-Free Room-Temperature Dual Singlet-Triplet Emitters for Organic Light-Emitting Diodes.
abstract: Metal-free dual singlet-triplet organic light-emitting diode (OLED) emitters can provide direct insight into spin statistics, spin correlations and spin relaxation phenomena, through a comparison of fluorescence to phosphorescence intensity. Remarkably, such materials can also function at room temperature, exhibiting phosphorescence lifetimes of several milliseconds. Using electroluminescence, quantum chemistry, and electron paramagnetic resonance spectroscopy, we investigate the effect of the conjugation pathway on radiative and nonradiative relaxation of the triplet state in phenazine-based compounds and demonstrate that the contribution of the phenazine nπ* excited state is crucial to enabling phosphorescence.
authors: Institut für Experimentelle und Angewandte Physik, Universität Regensburg , Universitätsstr. 31, 93040 Regensburg, Germany.
authors: Wolfram
authors: W
authors: Ratzke
authors: Kekulé-Institut für Organische Chemie und Biochemie, University of Bonn , Gerhard-Domagk-Str. 1, 53121 Bonn, Germany.
authors: Lisa
authors: L
authors: Schmitt
authors: Institute für Physikalische und Theoretische Chemie, University of Bonn , Wegelerstr. 12, 53115 Bonn, Germany.
authors: Hideto
authors: H
authors: Matsuoka
authors: Mulliken Center for Theoretical Chemistry, University of Bonn , Beringstr. 4, 53115 Bonn, Germany.
authors: Christoph
authors: C
authors: Bannwarth
authors: Max-Planck-Institut für Chemische Energiekonversion , Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany.
authors: Marius
authors: M
authors: Retegan
authors: Institut für Experimentelle und Angewandte Physik, Universität Regensburg , Universitätsstr. 31, 93040 Regensburg, Germany.
authors: Sebastian
authors: S
authors: Bange
authors: Institut für Experimentelle und Angewandte Physik, Universität Regensburg , Universitätsstr. 31, 93040 Regensburg, Germany.
authors: Philippe
authors: P
authors: Klemm
authors: Max-Planck-Institut für Chemische Energiekonversion , Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany.
authors: Frank
authors: F
authors: Neese
authors: Mulliken Center for Theoretical Chemistry, University of Bonn , Beringstr. 4, 53115 Bonn, Germany.
authors: Stefan
authors: S
authors: Grimme
authors: Institute für Physikalische und Theoretische Chemie, University of Bonn , Wegelerstr. 12, 53115 Bonn, Germany.
authors: Olav
authors: O
authors: Schiemann
authors: Institut für Experimentelle und Angewandte Physik, Universität Regensburg , Universitätsstr. 31, 93040 Regensburg, Germany.
authors: John M
authors: JM
authors: Lupton
authors: Kekulé-Institut für Organische Chemie und Biochemie, University of Bonn , Gerhard-Domagk-Str. 1, 53121 Bonn, Germany.
authors: Sigurd
authors: S
authors: Höger