Dibenzo[def,p]chrysene is primarily used in research and environmental studies due to its classification as a polycyclic aromatic hydrocarbon (PAH). It serves as a model compound for understanding the behavior, toxicity, and environmental impact of PAHs, which are often associated with air pollution and combustion processes. In toxicology, it is studied to assess its carcinogenic potential and to explore its mechanisms of action in biological systems. Additionally, it is used in analytical chemistry as a reference standard for detecting and quantifying PAHs in environmental samples, such as soil, water, and air. Its applications are largely confined to scientific investigations rather than industrial or commercial use.