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Photoluminescence
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Photoluminescence (abbreviated as PL) is light emission from any form of matter after the absorption of photons (electromagnetic radiation). It is one of many forms of luminescence (light emission) and is initiated by photoexcitation (excitation by photons), hence the prefix photo-. Following excitation various relaxation processes typically occur in which other photons are re-radiated. Time periods between absorption and emission may vary: ranging from short femtosecond-regime for emission involving free-carrier plasma in inorganic semiconductors up to milliseconds for phosphorescent processes in molecular systems; and under special circumstances delay of emission may even span to minutes or hours. Observation of photoluminescence at a certain energy can be viewed as indication that excitation populated an excited state associated with this transition energy. This video is targeted to blind users. Attribution: Article text available under CC-BY-SA Creative Commons image source in video
YouTube url:
https://youtu.be/EXTVw9pVlcI
Created:
23. 2. 2022 15:43:47
