Efficient, Color Stable White Organic Light-Emitting Diode Based on High Energy Level Yellowish-Green Dopants

摘要

White organic light-emitting diodes (WOLEDs) attract much attention in recent years due to their potential use in back light unit of flat panel displays, full color display and solid state lighting applications. The applications require WOLEDs possess high efficiency, appropriate color temperature, high color rendering index, and high color stability. Various approaches have been reported to improve the performance, which include doping of several fluorophors or phosphors in a single emitting layer (EML), synthesis of polymers incorporating different color emitting moieties, use of excimer or exciplex formed by one or two dopants, stacked several organic light emitting diodes (OLEDs), use of microcavity effect from single emission layer, down conversion of blue light,and multi-EML structure doped with different color emitting dopants.