When electricity is passed through an LED, a chemical reaction occurs in which electrons pass from the higher energy state (the anode) to the lower energy state (the cathode). As they do so, energy is released in the form of visible light.
When electricity is passed through an LED, a chemical reaction occurs in which electrons pass from the higher energy state (the anode) to the lower energy state (the cathode). As they do so, energy is released in the form of visible light.