Influence of interlayer on the performance of stacked white organic light-emitting devices

Stacked white organic light-emitting devices (WOLEDs) comprising of blue fluorescent and orange phosphorescent emissive units employing tri(8-hydroxyquinoline)aluminum (Alq(3)): Mg/MoO(3) as charge generation layer are fabricated. The working mechanism of Alq(3): Mg/MoO(3) is also discussed using a simple method. We demonstrate charge-carrier separation takes place only in MoO(3) layer. Stacked WOLED with better performance was obtained by adjusting the thickness of MoO(3). The stacked WOLED with efficiency of 39.2 cd/A has excellent color stability with the Commission Internationale de l'Eclairage coordinates only changing from (0.407, 0.405) to (0.398, 0.397) when luminance increases from 22 to 10 000 cd/m(2). (C) 2009 American Institute of Physics. [doi: 10.1063/1.3234379]