Aggregation-Induced Dual Phosphorescence from (o-Bromophenyl)-Bis(2,6-Dimethylphenyl)Borane at Room Temperature |
| |
| Authors: | Dr Zhu Wu Fabian Dinkelbach Dr Florian Kerner Dr Alexandra Friedrich Prof Dr Lei Ji Dr Vladimir Stepanenko Prof Dr Frank Würthner Prof Dr Christel M Marian Prof Dr Todd B Marder |
| |
| Institution: | 1. Institut für Anorganische Chemie and, Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany;2. Institut für Theoretische Chemie und Computerchemie, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, 40225 Düsseldorf, Germany;3. Institut für Organische Chemie and Center for Nanosystems Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany |
| |
| Abstract: | Designing highly efficient purely organic phosphors at room temperature remains a challenge because of fast non-radiative processes and slow intersystem crossing (ISC) rates. The majority of them emit only single component phosphorescence. Herein, we have prepared 3 isomers (o, m, p-bromophenyl)-bis(2,6-dimethylphenyl)boranes. Among the 3 isomers ( o -, m - and p - BrTAB ) synthesized, the ortho-one is the only one which shows dual phosphorescence, with a short lifetime of 0.8 ms and a long lifetime of 234 ms in the crystalline state at room temperature. Based on theoretical calculations and crystal structure analysis of o - BrTAB , the short lifetime component is ascribed to the T1M state of the monomer which emits the higher energy phosphorescence. The long-lived, lower energy phosphorescence emission is attributed to the T1A state of an aggregate, with multiple intermolecular interactions existing in crystalline o - BrTAB inhibiting nonradiative decay and stabilizing the triplet states efficiently. |
| |
| Keywords: | AIE luminescence phosphorescence triarylborane triplet |
|
|
