👉 Chemiluminescence is a phenomenon in which light is emitted from materials that are exposed to chemical reagents. This emission is usually due to the presence of an electron donor or acceptor, such as a hydrogen atom, and its corresponding electron being transferred to another material. The resulting change in the electronic configuration can produce a luminescent appearance on the surface of the material, which can be used for various applications, such as in photovoltaic cells, optical fibers, and chemical sensors.