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. 2022 Jun 8;14(22):25834-25841.
doi: 10.1021/acsami.2c02745. Epub 2022 May 24.

Achieving Balanced Electrical Performance of Host Material through Dual N-P═O Resonance Linkage for Efficient Electroluminescence

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Achieving Balanced Electrical Performance of Host Material through Dual N-P═O Resonance Linkage for Efficient Electroluminescence

Huanhuan Li et al. ACS Appl Mater Interfaces. .

Abstract

Developing high-performance host materials is one of the biggest challenges for blue and white thermally activated delayed-fluorescence (TADF) organic light-emitting diode (OLED) technology due to the rigorous requirements of both efficient carrier flux ability and high triplet energy (ET) levels in static donor-acceptor molecules. Here, with the aid of a dual-resonance strategy, a host molecule showing dynamic adaption features in the acceptor-resonance-donor-resonance-acceptor (A-r-D-r-A) molecular configuration has been successfully developed through the implantation of two acceptors of diphenylphosphine oxide into electron-donating 5,10-dihydrophenazine with N-P═O resonance linkages. Owing to the dual enantiotropic N+═P-O- resonances, the designed A-r-D-r-A molecule exhibits an extraordinarily balanced charge flux transportation attribute at high ET (2.96 eV). Excitingly, blue and warm-white TADF OLEDs hosted by the A-r-D-r-A molecule exhibit outstanding external quantum efficiencies of 14.7 and 20.3%, respectively. Our studies not only broaden the scope of resonance molecules but also indicate that a resonance structure is an effective linkage to develop optoelectronic materials with dynamically adaptive properties.

Keywords: TADF OLEDs; dynamic adaption; electrical performance; host material; resonance molecules.

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