There are several forms of photoluminescence that differ from each other according to several parameters. The time period between the absorption and emission of photons may vary depending on the substance.įigure 01: Fluorescent Solutions under UV Light In the relaxation step, photons are re-radiated or emitted. Following these excitations, there are relaxation processes as well. This means the electrons of the substance undergo excitations when the substance absorbs photons, and electrons move to higher energy states from lower energy states. This process initiates with photoexcitation. This light emission occurs when a substance absorbs electromagnetic radiation and re-emits the radiation. Photoluminescence is a form of luminescence that occurs with a photoexcitation via photon absorption. Summary – Photoluminescence vs Electroluminescence What is Photoluminescence? Photoluminescence vs Electroluminescence in Tabular Formĥ. In contrast, luminescence types such as fluorescence and phosphorescence occur from heated bodies. Luminescence is the emission of light by a substance that has not been heated. Photoluminescence and electroluminescence are two types of luminescence. The key difference between photoluminescence and electroluminescence is that photoluminescence occurs following the absorption of a photon, whereas electroluminescence occurs through the generation of light by the application of an alternating current to a semiconductor.
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