Used as a key intermediate in organic semiconductor materials, particularly in the synthesis of conjugated polymers for optoelectronic devices. It plays a significant role in the development of organic photovoltaics (OPVs) and organic light-emitting diodes (OLEDs) due to its strong electron-accepting properties and ability to enhance charge transport. Its selenium-containing structure contributes to improved charge carrier mobility and light absorption characteristics. Also employed in the preparation of fluorescent probes and sensors, where its heavy atom effect supports phosphorescence and enables detection in biological and environmental systems.