Used as an electron-transport and host material in organic light-emitting diodes (OLEDs), particularly in blue phosphorescent devices. Its high triplet energy and good thermal stability make it suitable for enhancing device efficiency and longevity. The spirobifluorene backbone provides structural rigidity, which helps maintain film integrity during device operation. Commonly employed in multilayer OLED architectures to improve electron injection and balance charge transport. Additionally, used as an additive in charge transport layers of organic solar cells to improve charge separation and transport.