Used as a key intermediate in the synthesis of organic semiconductors and optoelectronic materials. Its rigid fluorene backbone and functional groups make it suitable for constructing conjugated polymers and small molecules in organic light-emitting diodes (OLEDs) and organic field-effect transistors (OFETs). The bromine atom allows for further functionalization via cross-coupling reactions such as Suzuki or Heck coupling, enabling precise molecular engineering. Also employed in the development of fluorescent probes and sensors due to its favorable photophysical properties and structural stability.