Used as an intermediate in the synthesis of organic semiconductors and optoelectronic materials. Its aldehyde functional groups allow for easy modification in creating conjugated polymers and small molecules for applications in organic light-emitting diodes (OLEDs) and organic photovoltaics (OPVs). The carbazole backbone provides good hole-transport properties and thermal stability, making it valuable in designing efficient emissive or charge-transport layers in OLED devices. Also employed in the development of fluorescent sensors and dyes due to its rigid aromatic structure and ability to support intramolecular charge transfer.