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7621621 
Journal Article 
Triphenylamine/benzothiadiazole-based compounds for non-doped orange and red fluorescent OLEDs with high efficiencies and low efficiency roll-off 
Zhang, Di; Yu, J; Yang, T; Xu, H; Miao, Y; Chen, R; Shinar, R; Shinar, J; Wang, Hua; Xu, B; , 
2021 
Journal of Materials Chemistry C
ISSN: 2050-7526
EISSN: 2050-7534 
ROYAL SOC CHEMISTRY 
CAMBRIDGE 
4921-4926 
WOS:000635213100001 
Long-wavelength materials are key for development of pure-color and white organic Light-emitting devices (OLEDs). An organic molecule, combining hybridized local electron and charge-transfer (HLCT) states and aggregation-induced emission (AIE), not only breaks the 5% external quantum efficiency (EQE) Limit but also overcomes emission quenching. Herein, we designed and synthesized four novel donor-acceptor compounds of TBAN, TBT, TBAT, and TABAT using triphenylamine (TPA) as the donor, benzothiadiazole (BT) as the acceptor, and anthracene (AN) as a bridge. We found that the emission peaks of TBAN, TBT, TBAT and TABAT are Located at 596, 615, 580 and 546 nm, respectively. We successfully applied them to non-doped OLEDs, and the resulting devices exhibited excellent performance. For example, the optimal TBAN-based OLEDs showed a maximum Luminance of 74 820 cd m(-2), a current efficiency of 12.1 cd A(-1) and a maximum EQE of 5.7% with Low roll-off. Additionally, the device with TBAN as both the emitter and hole-transport material also exhibited high efficiency that is comparable to that of an NPB-based device. This work demonstrates that it is feasible to obtain excellent orange and red emitters by employing BT- and TPA-based D-A architectures.