Used as a high-performance host material in blue phosphorescent organic light-emitting diodes (PHOLEDs). Its excellent thermal stability and high triplet energy level make it ideal for efficient energy transfer to blue dopants, enhancing device efficiency and lifespan. Commonly employed in multilayer OLED structures, especially in emissive layers, where it helps confine excitons and reduce efficiency roll-off. Also utilized in thermally activated delayed fluorescence (TADF) OLEDs due to its suitable energy level alignment and charge transport properties.