Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 39, Pages 17137-17144Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202007610
Keywords
AIE; boron; El-Sayed's rule; non-radiative transition; RTP
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Funding
- Julius-Maximilians-Universitat Wurzburg
- Deutsche Forschungsgemeinschaft (DFG) [GRK 2112, 396890929/GRK 2482]
- China Scholarship Council
- Project DEAL
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Achieving highly efficient phosphorescence in purely organic luminophors at room temperature remains a major challenge due to slow intersystem crossing (ISC) rates in combination with effective non-radiative processes in those systems. Most room temperature phosphorescent (RTP) organic materials have O- or N-lone pairs leading to low lying (n, pi*) and (pi, pi*) excited states which acceleratek(isc)through El-Sayed's rule. Herein, we report the first persistent RTP with lifetimes up to 0.5 s from simple triarylboranes which have no lone pairs. RTP is only observed in the crystalline state and in highly doped PMMA films which are indicative of aggregation induced emission (AIE). Detailed crystal structure analysis suggested that intermolecular interactions are important for efficient RTP. Furthermore, photophysical studies of the isolated molecules in a frozen glass, in combination with DFT/MRCI calculations, show that (sigma, B p)->(pi, B p) transitions accelerate the ISC process. This work provides a new approach for the design of RTP materials without (n, pi*) transitions.
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