33‐3: Invited Paper: Shaping the Emissive Layer of Green Phosphorescent OLEDs: High Performance Hosts for Various Dopants and Applications

In this article, we review recent developments of modern host materials for green phosphorescent OLEDs. We show that optical emitter orientation can be enhanced significantly by tailored hosts, resulting in an increased device efficiency. Beyond efficiency, matching the host system to the applied emitter is shown to be key for an optimum device performance. In addition to maximized classical device performance parameters, modern hosts need to fulfill further requirements. Prominent examples are the tuning of the OLED stack capacitance by the host or the development of stable premixed host systems, enabling the evaporation of multiple host materials from one crucible.