34.2: Invited Paper : Highly Efficient and Stable OLEDs Using Hosts with Thermally Activated Delayed Fluorescence

It is demonstrated that materials with thermally activated delayed fluorescence (TADF) are ideal host materials for organic light‐emitting diodes (OLEDs). TADF‐sensitized‐fluorescent OLEDs exhibit maximum power efficiency up to 45 lm/W. TADF‐sensitized‐phosphorescent OLEDs show high efficiency, low voltage and long lifetime even at low phosphor concentrations of <3 wt%.