Phenalene demonstrates a high degree of absorption in the visible light spectrum due to its conjugated pielectron system, resulting in a distinctive deep red coloration . Its optical properties are predominantly characterized by its propensity to readily form a stable radical anion (phenalenyl radical) with a delocalized negative charge on the central carbon atom. This radical anion exerts a substantial influence on the absorption and emission characteristics of the phenalene. From the optical perspective, the attractive properties are given below.