3,6-Diphenylcarbazole is an organic compound featuring a carbazole core substituted with phenyl groups at the 3- and 6-positions. It is a solid with a molecular formula of C24H17N and a molecular weight of 319.40 g/mol. The carbazole unit is a classic and widely studied building block in organic electronics due to its rigid, planar structure and good hole-transporting properties. This compound serves as a crucial precursor or core unit in the synthesis of advanced organic optoelectronic materials. Its primary application is in the field of organic light-emitting diodes (OLEDs), where it is used to construct host materials, hole-transporting materials (HTMs), and emitters, particularly for blue and deep-blue light emission. The phenyl substitutions can be further functionalized to tune the material's thermal stability, solubility, and electronic properties (such as HOMO/LUMO energy levels) for device optimization. Beyond OLEDs, 3,6-diphenylcarbazole derivatives are also explored in other areas such as organic photovoltaics (OPVs) and organic field-effect transistors (OFETs) due to their favorable charge carrier mobility and film-forming characteristics. Its synthesis and modification are central to the development of new high-performance organic semiconductor materials.