Carbazole modified orthophenylene compounds, 9-([1,1′:2′,1′′-terphenyl]-3-yl)carbazole (Cz-Ter), 9-([1,1′:2′,1′′:2′′,1′′′-quaterphenyl]-3-yl)carbazole (Cz-Quat), 9-([1,1′:2′,1′′:2′′,1′′′:2′′′,1′′′′-quinquephenyl]-3-yl)carbazole (Cz-Quin), were synthesized as host materials for blue phosphorescent organic light emitting diodes. The carbazole modified orthophenylene based host materials showed high triplet energy of above 2.90 eV and there was no reduction of triplet energy according to the increase in the number of phenyl units of the orthophenylene moieties. Cz-Ter, Cz-Quat and Cz-Quin showed maximum quantum efficiencies of 16.2%, 17.3% and 20.9% in blue PHOLEDs, respectively.
改性氮杂
蒽的邻苯基化合物,9-([1,1′:2′,1′′-三苯基]-3-基)氮杂
蒽(Cz-Ter),9-([1,1′:2′,1′′:2′′,1′′′-四苯基]-3-基)氮杂
蒽(Cz-Quat),9-([1,1′:2′,1′′:2′′,1′′′:2′′′,1′′′′-五苯基]-3-基)氮杂
蒽(Cz-Quin)被合成作为蓝色
磷光有机发光二极管(PHOLEDs)的载体材料。这些改性氮杂
蒽的邻苯基基化载体材料表现出高达2.90 eV以上的三重态能量,并且随着邻苯基部分的苯基单元数量的增加,三重态能量没有降低。Cz-Ter、Cz-Quat和Cz-Quin在蓝色PHOLED中分别显示出最高量子效率为16.2%、17.3%和20.9%。