Used primarily in organic synthesis, 9-Bromophenanthrene serves as a key intermediate in the production of various complex organic compounds. Its application is significant in the development of pharmaceuticals, where it contributes to the synthesis of active pharmaceutical ingredients (APIs). Additionally, it is utilized in material science for the creation of organic semiconductors and light-emitting diodes (LEDs), playing a role in advancing electronic and optoelectronic devices. Researchers also employ it in the study of polycyclic aromatic hydrocarbons (PAHs) to understand their environmental impact and chemical behavior.