Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 123, Issue 30, Pages 18585-18592Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.9b05875
Keywords
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Funding
- National Basic Research Program of China [2015CB655003]
- National Natural Science Foundation of China [21772064, 51803069]
- China Postdoctoral Science Foundation [2018T110244, 2018M630319]
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Organic light-emitting materials with thermally activated delayed fluorescence (TADF) are promising for promoting the efficiency of organic light emitting diodes (OLEDs) without any precious metals. However, the device performance of the deep-red/near-infrared (DR/NIR) TADF-OLEDs remains backward compared with that of blue, green, and orange-red TADF-OLEDs. In this contribution, a donor acceptor type TADF emitter, 2-(tert-butyl)-6-(4-(diphenylamino)phenyl)phenanthro [4,5-abc]phenazine-11,12-dicarbonitrile, namely, TPA-PPDCN, containing a large rigid phenanthro[4,5-abc]phenazine-11,12-dicarbonitrile as an acceptor unit and a triphenylamine (TPA) as a donor moiety, is designed and synthesized. The compound exhibits excellent thermal stability, small singlet-triplet energy split and a strong DR/NIR emission with the photoluminescence quantum yields of 73-87% in doped thin films. More importantly, highly efficient DR and NIR OLEDs with emission peaks at 664 and 692 nm and the maximum external quantum efficiencies of 20.2 and 16.4%, respectively, have been achieved, which represent the highest' device performance among the reported DR/NIR TADF OLEDs.
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