Used as a key intermediate in the synthesis of high-performance organic semiconductors and optoelectronic materials. Its rigid spirobifluorene core enhances thermal stability and prevents crystallization in thin films, making it ideal for OLEDs and perovskite solar cells. The bromo functional group allows for further cross-coupling reactions, enabling precise molecular engineering of hole-transport materials and emitters. Commonly incorporated into host materials for blue phosphorescent OLEDs due to its wide bandgap and good charge transport properties. Also employed in the development of stable, efficient perovskite solar cell devices as a component of hole-transporting layers.