Used as a key intermediate in the synthesis of organic semiconductors and optoelectronic materials. Its rigid spirobifluorene structure provides thermal stability and prevents crystallization in thin films, making it valuable in OLEDs (organic light-emitting diodes) and perovskite solar cells. The bromine functional group allows for further cross-coupling reactions, such as Suzuki or Buchwald-Hartwig, enabling the construction of complex conjugated systems for hole-transport materials and host matrices in emissive layers.