High triplet energy level and thermal stability are crucial properties for host materials to fulfill organic light-emitting devices (OLEDs) with great performance. In this work, four π-shape bipolar host materials, GHA1-4 were designed and synthesized using dibenzofuran core. These hosts exhibit high triplet energy levels as well as excellent thermal stability. Green top-emission OLEDs with GHA1-4 as hosts and Ir (ppy)₃ as emitter exhibited excellent performance with high external quantum efficiency (EQE_max) values of above 40%. In addition, devices incorporating GHA1 and GHA3 exhibit a low turn on voltage of 2.07 V, EQE_max of 45.0% and long LT₉₅ device lifetime of 184 h, as well as remarkably small roll-off of only 2.5% at the brightness of 10,000 cd/m².

高三线态能级和热稳定性是主体材料实现高性能有机发光器件 (OLED) 的关键特性。在这项工作中，使用二苯并呋喃核设计和合成了四种 π 形双极主体材料GHA1-4 。这些宿主表现出高三线态能级以及出色的热稳定性。以GHA1-4作为主体和 Ir (ppy) ₃作为发射体的绿色顶发射 OLED表现出优异的性能，具有高于 40% 的高外部量子效率 (EQE _{max ) 值。}此外，采用GHA1和GHA3的器件具有 2.07 V 的低开启电压、 45.0% 的_最大EQE和长 LT₉₅器件寿命为 184 小时，并且在 10,000 cd/m ²的亮度下滚降非常小，仅为 2.5% 。