Fluorescence Definition

Chemistry Glossary Definition of Fluorescence

Fluorescent light
Fluorescent lights are coated with phoshors that absorb energy and release it as visible light. Verena Andrea Philipp / EyeEm / Getty Images

:Fluorescence Definition

Fluorescence is luminescence that occurs where the energy is supplied by electromagnetic radiation, usually ultraviolet light. The energy source kicks an electron of an atom from a lower energy state into an "excited" higher energy state; then the electron releases the energy in the form of light (luminescence) when it falls back to a lower energy state.

Fluorescence Examples:

fluorescent lights, the red glow of rubies in sunlight, phosphors in television screens

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Helmenstine, Anne Marie, Ph.D. "Fluorescence Definition." ThoughtCo, Feb. 8, 2017, thoughtco.com/definition-of-fluorescence-604467. Helmenstine, Anne Marie, Ph.D. (2017, February 8). Fluorescence Definition. Retrieved from https://www.thoughtco.com/definition-of-fluorescence-604467 Helmenstine, Anne Marie, Ph.D. "Fluorescence Definition." ThoughtCo. https://www.thoughtco.com/definition-of-fluorescence-604467 (accessed May 23, 2018).