Used as a key intermediate in organic synthesis, particularly in the development of hole-transport materials for perovskite solar cells. Its rigid spirobifluorene core enhances thermal stability and film-forming properties, improving device efficiency and longevity. Also employed in OLEDs as a building block for blue emitters and host materials due to its high triplet energy and good charge transport characteristics. The methoxy groups improve solubility and film quality in solution-processed devices.