Used as a key monomer in the synthesis of conjugated polymers for organic electronics, particularly in organic photovoltaics (OPVs) and organic light-emitting diodes (OLEDs). Its structure supports efficient charge transport and enhances polymer stability. The carboxylic acid groups allow for solubility tuning and covalent attachment to surfaces or nanoparticles. Also employed in the development of donor-acceptor type polymers due to its rigid fluorene backbone and bromine sites for further functionalization via cross-coupling reactions.