Used as a key intermediate in the synthesis of organic semiconductors and optoelectronic materials. Its rigid, twisted fluorene backbone enhances thermal stability and influences molecular packing in thin films, making it valuable in OLEDs (organic light-emitting diodes) and OFETs (organic field-effect transistors). Frequently employed in donor materials for perovskite solar cells due to its hole-transport properties and ability to form stable amorphous films. Also serves as a building block in the development of fluorescent dyes and sensors, where its extended π-system supports strong emission and environmental sensitivity.