👉 Luminescence is a phenomenon in which an object emits light when exposed to an electric current. It can be caused by a variety of materials, including metals and semiconductors, but it is most commonly associated with minerals that contain iron oxides or other materials that emit light when heated. In the context of optics, luminescence refers to the emission of light in certain conditions, such as illumination under UV light or exposure to ultraviolet radiation. This phenomenon can be used for various
