49.3: Highly Efficient OLED Devices with Device Architecture for Reducing Drive Voltage

We have developed phosphorescent OLEDs utilizing energy transfer from an exciplex to an emitter. The OLEDs based on this mechanism showed quite high efficiency, a long lifetime and low drive voltage. OLED lighting with high power efficiency exceeding 100 lm/W at a practical luminance of 5,000 cd/m2 was also successfully developed.