Used as a key intermediate in organic synthesis, particularly in Suzuki-Miyaura cross-coupling reactions to build complex conjugated systems for optoelectronic materials. Commonly applied in the development of organic light-emitting diodes (OLEDs), especially as a building block for host or emissive layer materials in blue emitters. Its boronate ester groups enable efficient and selective coupling with aryl halides, making it valuable for constructing high-performance organic semiconductors. Also employed in the synthesis of thermally activated delayed fluorescence (TADF) emitters and hole-transport materials due to its stable carbazole core and tunable electronic properties.