Used as a key intermediate in organic light-emitting diodes (OLEDs), particularly in blue-emitting devices due to its high triplet energy and good thermal stability. Its rigid spiro structure helps prevent close molecular packing, reducing aggregation and enhancing device efficiency. Commonly employed in host materials for phosphorescent and thermally activated delayed fluorescence (TADF) OLEDs. Also explored in perovskite solar cells as a hole-transporting material owing to its suitable energy levels and film-forming properties.