| 초록 |
Two host materials, 7-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-7H-dibenzo[a,g]carbazole (TRZ-DBC1 andTRZ-DBC2) were designed and synthesized for yellow PhOLEDs. Both the host materials revealed good physical properties. To study the device efficiencies, we have constructed yellow phosphorescent OLED devices. The TRZ-DBC1 based yellow device showed excellent current efficiency of 71.4 cd/A, while reference device based on CBP host revealed lower efficiency of 58.0 cd/A. The lower turn on voltage 2.3 and 2.5 V were observed for TRZ-DBC1 andTRZ-DBC2, respectively. The external quantum efficiency of TRZ-DBC1 (25.4%) and TRZ-DBC2 (22.4%) were excellent when compare to reference device which was 19.1%. TRZ- DBC2 based yellow devices showed excellent luminescence of 98,680 cd/m2. |
