HOST MATERIALS FOR SINGLE-LAYER PHOSPHORESCENT OLEDS

摘要

New carbazole-based compounds are provided that are useful as host materialsforsingle-layer and multilayer organic light-emitting diode (OLED) devices.Highly efficientsingle-layer OLEDs have been demonstrated using new N-heterocyclic carbazole-based hostmaterials. Phosphorescent OLEDs with a structure ofITO/MoO3/host/host:dopant/host/Cs2CO3/Al have been fabricated in which the newhostmaterials act simultaneously as electron-transport, hole-transport and hostlayer. Using thisdesign, devices with maximum current and external quantum efficiencies of 92.2cd A-1 and26.8% were achieved, the highest reported to date for a single-layer OLED.