Used as a key building block in the synthesis of high-performance organic semiconductors and optoelectronic materials. Its rigid fluorene backbone enhances thermal stability and promotes efficient π-conjugation, making it valuable in the development of organic light-emitting diodes (OLEDs) and organic photovoltaics (OPVs). The hydroxyl groups at the 2 and 7 positions allow for easy functionalization, enabling incorporation into polymers or small molecules for tailored electronic properties. Also employed in the preparation of fluorescent dyes and sensors due to its strong luminescence and structural rigidity.