Solution-processed small-molecule WOLEDs were fabricated with co-host system.
Two-color phosphorescent WOLED using F3Irpic and Ir(MDQ)2acac has been structured.
The WOLED shows maximum efficiencies of 40.9 cd/A and 16.9% with mild roll-off.
The WOLED shows very high spectra stability in a large range of brightness.