3-Phenylisoquinoline finds applications in various fields due to its unique chemical structure. In medicinal chemistry, it serves as a key intermediate in the synthesis of bioactive compounds, particularly those targeting neurological disorders and cancer. Its framework is often utilized to develop inhibitors for specific enzymes or receptors involved in disease pathways. Additionally, it is employed in material science for the creation of organic semiconductors and light-emitting diodes (OLEDs), where its aromatic properties enhance electron mobility and stability. Researchers also explore its potential in fluorescent probes for imaging and sensing applications, leveraging its photophysical characteristics.