Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 33, Pages 13955-13961Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202005584
Keywords
charge transfer; mechanochromism; organic light-emitting diodes; solid-state luminescence; thermally activated delayed fluorescence
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Funding
- Research Foundation for the Electrotechnology of Chubu
- Hoso Bunka Foundation
- Hirose International Scholarship Foundation
- Cooperative Research Program Network Joint Research Center for Materials and Devices
- [JP18H02048]
- [JP19K15651]
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Herein, the universal design of high-efficiency stimuli-responsive luminous materials endowed with mechanochromic luminescence (MCL) and thermally activated delayed fluorescence (TADF) functions is reported. The origin of the unique stimuli-triggered TADF switching for a series of carbazole-isophthalonitrile-based donor-acceptor (D-A) luminogens is demonstrated based on systematic photophysical and X-ray analysis, coupled with theoretical calculations. It was revealed that a tiny alteration of the intramolecular D-A twisting in the excited-state structures governed by the solid morphologies is responsible for this dynamic TADF switching behavior. This concept is applicable to the fabrication of bicolor emissive organic light-emitting diodes using a single TADF emitter.
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