Oxadiazole derivatives as bipolar host materials for high-performance blue and green phosphorescent organic light-emitting diodes
作者:Yanming Wang、Keke Duan、Guoxiang Li、Gewen Yu
DOI:10.1039/c9ra07129f
日期:——
pyridine and oxadiazole, with one p-type carbazole group, two novel bipolar hosts, namely 2-(3-(9H-carbazol-9-yl)-[1,1′-biphenyl]-3-yl)-5-(pyridin-2-yl)-1,3,4-oxadiazole (PyOxd-mCz) and 2-(4′-(9H-carbazol-9-yl)-[1,1′-biphenyl]-3-yl)-5-(pyridin-2-yl)-1,3,4-oxadiazole (PyOxd-pCz) have been developed as hosts for blue and green phosphorescent organic light-emitting diodes (PhOLEDs). The two compounds exhibit
通过将两个 n 型基团吡啶和恶二唑与一个 p 型咔唑基团结合,形成两种新型双极性主体,即 2-(3-(9 H -carbazol-9-yl)-[1,1'-biphenyl] -3-yl)-5-(pyridin-2-yl)-1,3,4-oxadiazole ( PyOxd-mCz ) 和 2-(4'-(9 H -carbazol-9-yl)-[1,1 '-联苯]-3-基)-5-(吡啶-2-基)-1,3,4-恶二唑( PyOxd-pCz )已被开发为蓝色和绿色磷光有机发光二极管(PhOLED)的主体. 这两种化合物表现出相似的 HOMO 能级,即 PyOxd-mCz 为 -5.64 eV,PyOxd-pCz为-5.63 eV,以及相同的 LUMO 能级为 -2.60 eV。由于元连接,PyOxd-mCz具有更扭曲的配置具有比PyOxd-pCz ( E T = 2.60 eV)更高的三重态能级 (