Used as a high-performance host material in blue phosphorescent organic light-emitting diodes (PHOLEDs). Its strong electron-transporting properties and high triplet energy level make it ideal for improving device efficiency and stability. Commonly employed in the emissive layer to host blue-emitting dopants, it helps achieve low driving voltages and high external quantum efficiencies. Also utilized in tandem OLED structures due to its excellent thermal stability and morphological robustness under electrical stress.