White OLED devices

Abstract

In this chapter, we will review the progress of white OLEDs based on organic small molecules in view of device architectures. The basics of white OLED devices are, firstly, demonstrated, and then the advanced architectures and current status of white OLEDs based on fluorescent, phosphorescent, and hybrid emitters are discussed. Because tandem structures, where similar or different emitting units are connected through a charge generation layer (CGL), provide further improvement in the efficiency and stability of white OLEDs, the advances of tandem white OLEDs are also discussed. Finally, the future outlook of white OLEDs is given.