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fluorescence

Fluorescence is the first brief emission of light produced when light-emitting materials are excited. In the case of phosphorus

, fluorescence changes to phosphorescence after decay. In fluorescence, the emitting material is activated

withlight whereby the electrons from the conduction band fall back into the valence band and occupy the vacancies. This produces an emission in the form of electromagnetic radiation

or light emission.

Fluorescence and phosphorescence of phosphors

Fluorescence and phosphorescence of phosphors

The extremely short-lived fluorescence, which can be only a few nanoseconds or microseconds long, has a different wavelength than the excitation light and also differs in the emitted color temperature from the subsequent phosphorescence, the afterglow, as is known from phosphors, for example. In contrast to fluorescence, phosphorescence can last from a few milliseconds to several minutes.

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Englisch: fluorescence
Updated at: 23.05.2016
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