Used primarily as a research chemical in organic synthesis and materials science, 2-ethylphenanthrene serves as a building block for polycyclic aromatic compounds. It finds application in the development of organic semiconductors and luminescent materials due to its extended aromatic structure. Its derivatives are explored in the design of organic light-emitting diodes (OLEDs) and sensors. Additionally, it is employed in studies related to aromatic hydrocarbon reactivity and environmental degradation pathways.