Used in organic electronics, particularly in the synthesis of conjugated polymers and small molecules for optoelectronic devices. Its aldehyde functional groups allow for easy incorporation into larger aromatic systems via condensation reactions, making it valuable in the development of organic light-emitting diodes (OLEDs) and organic photovoltaics (OPVs). The carbazole core contributes to hole-transport properties and thermal stability, enhancing device performance. It also serves as a building block in the preparation of fluorescent dyes and sensors due to its rigid, planar structure and favorable electronic characteristics.