2-Phenylanthraquinone is primarily used as a key intermediate in the synthesis of dyes and pigments, particularly in the production of vat dyes, which are known for their excellent color fastness and resistance to light and washing. It plays a significant role in the textile industry, where it contributes to the vibrant and durable coloring of fabrics. Additionally, this compound is utilized in organic synthesis for the preparation of various heterocyclic compounds, which are important in pharmaceuticals and agrochemicals. Its application extends to the field of photochemistry, where it is studied for its potential in photoinitiation processes and as a sensitizer in photochemical reactions.