Used as a key intermediate in the synthesis of high-performance polymers, particularly in the production of advanced polyesters and polycarbonates. Its rigid fluorene backbone and bromine functional groups enable strong thermal stability and promote efficient cross-linking in polymer chains. Commonly applied in the development of optoelectronic materials, including organic light-emitting diodes (OLEDs) and organic photovoltaics, due to its ability to enhance charge transport and film morphology. Also serves as a building block in Suzuki and other palladium-catalyzed coupling reactions for creating conjugated systems in organic semiconductors.