Journal
ADVANCED OPTICAL MATERIALS
Volume 10, Issue 3, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202101789
Keywords
color purity; intersegmental charge-transfer; multiple resonance; red OLEDs
Categories
Funding
- National Key Research & Development Program of China [2020YFA0714601, 2020YFA0714604]
- National Natural Science Foundation of China [52130304, 51821002, 52003185, 52003186]
- China Postdoctoral Science Foundation [2019M661924]
- Suzhou Key Laboratory of Functional Nano Soft Materials
- Collaborative Innovation Center of Suzhou Nano Science Technology
- 111 Project
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This research highlights the challenges in developing MR-TADF emitters that maintain high color purity in the red region, and emphasizes the importance of excited state alignments of MR-based donor-acceptor molecules in determining their preferring characteristics. By using the newly designed MR-based D-A molecule mBDPA-TOAT, high external quantum efficiency and color purity are achieved.
Thermally activated delayed fluorescence (TADF) emitters induced by the multiple resonance (MR) effect have garnered considerable attention. However, it is difficult to develop MR-TADF emitters that maintain high color purities in the red region. In this work, the importance of excited state alignments of MR-based donor-acceptor (D-A) molecules in determining their preferring characteristics is clarified. By using the newly designed molecule mBDPA-TOAT whose apparent excited states show hybridization of MR and intersegmental charge-transfer features as an emitter in an organic light-emitting diode (OLED), a high external quantum efficiency of 17.3% is achieved with a full width at half-maximum of 45 nm (154 meV) and Commission Internationale de L'eclairage coordinate of (0.61, 0.39). This work demonstrates when introducing D-A typed structures, features, and alignments of molecular excited states determine ultimate material properties. This could help to develop high efficiency and high color purity TADF emitters toward long wavelength range.
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