Used primarily as an intermediate in organic synthesis, especially in the preparation of conjugated polymers and small molecule semiconductors for optoelectronic devices. Its halogen substitution pattern allows for selective cross-coupling reactions, such as Suzuki or Stille couplings, enabling the construction of complex aromatic frameworks. Commonly employed in the development of materials for organic light-emitting diodes (OLEDs), organic field-effect transistors (OFETs), and organic photovoltaics (OPVs). The fluorene backbone contributes to enhanced thermal stability and planarity, improving charge transport properties in the resulting materials.