Two host materials H1 and H2 by introducing dibenzothiophene and dibezofuran moieties into the carbazole and pyridine derivative, respectively, are reported. Their structural and physical properties were fully characterized. The thermal analysis demonstrated that both H1 and H2 are thermally stable. The triplet energy levels of H1 and H2 were determined to be 2.66 and 2.51 eV, respectively. Green phosphorescent OLEDs with H1 and H2 acting as host materials were fabricated to investigate their performances in PHOLEDs. Green PHOLED based on H1 shows the best performance with the maximum power efficiency of 50.4 lm/W and the lowest driving voltage of 2.5 eV. The characteristic measurements of OLED devices reveal that both H1 and H2 are promising host materials for practical application. By comparing with the commercial host material of 4,4′-bis(carbazol-9-yl)biphenyl (CBP), the power efficiency of green PHOLED was enhanced by 31.6%.

报道了通过将二苯并噻吩和二苯并呋喃部分分别引入咔唑和吡啶衍生物中的两种主体材料H1和H2。它们的结构和物理性质得到充分表征。热分析表明，H1和H2都是热稳定的。H1和H2的三重态能级分别确定为2.66和2.51 eV。制备了以H1和H2为主体材料的绿色磷光OLED，以研究其在PHOLED中的性能。基于H1的绿色PHOLED以50.4 lm / W的最大功率效率和2.5 eV的最低驱动电压显示出最佳性能。OLED器件的特性测量表明，H1和H2都是有希望用于实际应用的基质材料。通过与商业主体材料4,4'-双（咔唑-9-基）联苯（CBP）进行比较，绿色PHOLED的功率效率提高了31.6％。