Used as a key intermediate in organic light-emitting diode (OLED) materials, particularly in the synthesis of hole-transport or host materials for blue phosphorescent OLEDs. Its spiro structure provides high thermal stability and prevents close packing, reducing aggregation and excimer formation. The bromine functional group allows for further coupling reactions, such as Suzuki or Buchwald-Hartwig, enabling the construction of larger conjugated systems for enhanced charge transport. Commonly applied in emissive layer components to improve device efficiency and lifetime.