Used as a key intermediate in the synthesis of organic semiconductors and optoelectronic materials. Its rigid spirobifluorene backbone enhances thermal stability and prevents crystallization in thin films, making it valuable in OLEDs (organic light-emitting diodes) for display and lighting technologies. The amine group allows for easy functionalization, enabling its use in hole-transport materials and as a building block in conjugated polymers for efficient electron transport. Also explored in perovskite solar cells to improve device stability and performance.