9-(4-Aminophenyl)carbazole is primarily used in the field of organic electronics and materials science. It serves as a key building block in the synthesis of organic semiconductors, which are essential components in organic light-emitting diodes (OLEDs) and organic photovoltaic (OPV) devices. Its structure allows for efficient charge transport, making it valuable in the development of high-performance electronic materials. Additionally, it is utilized in the creation of fluorescent dyes and sensors due to its photophysical properties, which enable sensitive detection of various analytes. The compound also finds applications in the preparation of polymers and coatings, where it enhances thermal stability and mechanical properties.