Used as a high-performance host material in blue phosphorescent organic light-emitting diodes (PHOLEDs). Its strong electron-accepting nitrile groups and twisted carbazole-based structure provide excellent thermal stability and efficient charge transport. It helps improve device efficiency and lifetime by preventing exciton quenching and facilitating balanced electron-hole recombination. Commonly employed in multilayer OLED architectures for display and lighting applications requiring deep blue emission.