Used as a key building block in organic semiconductor materials, particularly in the synthesis of advanced polymers for optoelectronic devices. Commonly employed in the development of blue-emitting materials for OLEDs (organic light-emitting diodes) due to its rigid spiro structure that enhances thermal stability and reduces aggregation. Also serves as a core structure in host materials for phosphorescent OLEDs. Its bromine functional groups allow for easy cross-coupling reactions, making it valuable in creating complex conjugated systems for organic photovoltaics and field-effect transistors.