Efficient and color stable phosphorescent White Organic light emitting devices using ultra wide band gap host materials

摘要

We developed phosphorescent white OLEDs with high efficiency and color stability. By engineering device architecture in which confined excitons within the emissive layer by using adequate interlayer and balanced recombination of charge carriers by using stepwise hole transporting layer system, these WOLEDs showed power efficacy of 43.6 lm/W with CRI = 62 and 36 lm/W with CRI = 72 at 100 cd/m~2 without outcoupling enhancements.