| 초록 |
In the past few years, many kinds of host materials such as polymers, large molecules, and small molecules were demonstrated for solution-processable TADF-OLEDs. Among them, uniform molecular dyad can be easily synthesized and purified. Owing to large molecular weight, it can provide good film forming property via solution-process. In molecular dyad structure, we can introduce donor and acceptor moieties, which can be isolated through a non-conjugated cyclohexane spacer. Our objective is to maintain intrinsic molecular properties of donor and acceptor and to give bipolar electronic nature. In this work, a bipolar molecular dyad (e.g. BCzTC) having a cyclohexane spacer was synthesized and applied to TADF-OLEDs. The device performances were compared to those of devices made with corresponding p-type, n-type, and mixed hosts. The OLED devices made with BCzTC as a bipolar host and t4CzIPN as an emitter showed an high external quantum efficiency (EQE) and low roll-off behaviors. |
