Triphenylamine/Benzothiadiazole-Based Compounds For Non-Doped Orange And Red Fluorescent Oleds With High Efficiencies And Low Efficiency Roll-Off

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.