Used in organic light-emitting diodes (OLEDs) as a key building block for host materials in blue phosphorescent devices due to its high triplet energy and good thermal stability. Its rigid carbazole core enhances hole-transport properties, making it valuable in emissive and charge-transport layers of OLED displays and lighting. Also employed in the synthesis of pharmaceuticals and photoactive compounds where carbazole derivatives are needed. Shows promise in perovskite solar cells as a dopant-free hole-transport material, improving device efficiency and stability.