Novel host materials containing dibenzofuran and dibenzothiophene, (5-(8-(9H-carbazole-9-yl)dibenzo[b,d]furan-2-yl)thiophene-2-yl)diphenylphosphine oxide (3, CFTPO) and (5-(8-(9H-carbazol-9-yl)dibenzo[b,d]thiophen-2-yl)thiophen-2-yl)diphenylphosphine oxide (4, CTTPO) were synthesized and employed as yellow host materials. The CFTPO host material had bipolar characteristics because it contained carbazole, dibenzofuran, and diphenylphosphine oxide charge transport units with triplet energy (2.56 eV), high external quantum efficiency (24.4%), and power efficiency (63.4 lm/W) in a yellow phosphorescent device. The CTTPO host material also had bipolar characteristics because it contained carbazole, dibenzothiophene, and diphenylphosphine oxide charge transport units with triplet energy (2.52 eV), high quantum efficiency (25.4%), and power efficiency (65.7 lm/W) in a yellow phosphorescent device.

含有二苯并呋喃和二苯并噻吩的新型主体材料，(5-(8-(9 H-咔唑-9-基)二苯并[ b,d ]呋喃-2-基)噻吩-2-基)二苯基氧化膦( 3，CFTPO )和合成了(5-(8-(9H-咔唑-9-基)二苯并[ b,d ]噻吩-2-基)噻吩-2-基)二苯基氧化膦( 4 , CTTPO )并用作黄色主体材料。CFTPO主体材料具有双极性特性，因为它含有咔唑、二苯并呋喃和二苯基膦氧化物电荷传输单元，在黄色磷光中具有三线态能量（2.56 eV）、高外量子效率（24.4%）和功率效率（63.4 lm/W）设备。CTTPO主体材料还具有双极性特性，因为它含有咔唑、二苯并噻吩和二苯基氧化膦电荷传输单元，在黄色磷光中具有三线态能量（2.52 eV ）、高量子效率（25.4%）和功率效率（65.7 lm/W）设备。