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

摘要

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.