The emission of one or more photons by a molecule or atom activated by the absorption of a quantum of electro-magnetic radiation. Typically the emission, that is of longer wavelength than the excitatory radiation, occurs within 10-8 seconds : phosphorescence is a phenomenon with a longer or much longer delay in re-radiation. Note that gamma-rays, X-rays, UV, visible light and IR radiations may all stimulate fluorescence.
The slow emission of longer wavelength light following the absorption of shorter wavelength radiation. Fluorescence is common with aromatic compounds with several rings joined together. Phosphorescence is similar but may persist long after the stimulating radiation is extinguished.
instantaneous re-emission of light of a greater wave length than that light originally absorbed.
The phenomenon of emitting light upon absorbing radiation of an invisible wavelength.
Short-lived luminescence (a glow not caused by high temperature). Phosphorescence lasts a little longer. Fluorescence is used in strip and other lighting, and was developed rapidly during World War II because it was a more efficient means of illumination than the incandescent lamp. Recently, small bulb-size fluorescence lamps have reached t...Found on http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0015996.html
Absorption of high energy radiation by a substance and subsequent emission of visible light.Found on http://www.encyclo.co.uk/local/10003
If a substance absorbs light at one wavelength and re-radiates it at another wavelength almost immediately, it is fluorescent; this is why many materials glow under ultraviolet light. If the substance keeps re-radiating light over a period of seconds, minutes, or hours, it is called phosphorescent. Found on http://www.encyclo.co.uk/local/20046
visible light emitted from a material while it is exposed to ultraviolet radiation ('black light'). Found on http://www.cst.cmich.edu/users/dietr1rv/gemrxAppB.htm
- light emitted during absorption of radiation of some other (invisible) wavelengthFound on http://www.webdictionary.co.uk/definition.php?query=fluorescence
Some minerals will glow in the dark when exposed to ultraviolet light or X-rays. This effect derives its name from the mineral fluorite, which is a good demonstrating mineral for this effect.
Found on http://www.quartznall.co.uk/azhealthguide.htm
The property of a material whereby it emits visible light when it is illuminated by ultraviolet light. See also: Ultraviolet Light.Found on http://www.diracdelta.co.uk/science/source/f/l/fluorescence/source.html
Absorption of high energy radiation by a substance and subsequent emission of visible light.Found on http://www.encyclo.co.uk/local/20728
fluorescent; fluorescent compound. A fluorescent substance absorbs short wavelength radiation and re-emits it as radiation with a longer wavelength in a very short time. Found on http://antoine.frostburg.edu/chem/senese/101/glossary/f.shtml
The slow emission of longer wavelength light following the absorption of shorter wavelength radiation. Fluorescence is common with aromatic compounds with several rings joined together. Phosphorescence is similar but may persist long after the stimulatingFound on http://www.chemicalglossary.net/definition/775-Fluorescence
[ From Fluor
That property which some transparent bodies have of producing at their surface, or within their substance, light different in color from the mass of the material, as when green crystals of fluor spar afford blue reflections. It is due not to the d...Found on http://www.encyclo.co.uk/webster/F/49
A property possessed by fluor spar, uranium glass, sulphide of calcium, and many other substances, of glowing without appreciable rise of temperature when exposed to light or to ultra-violet rays, cathode rays, X rays, etc. Found on http://www.encyclo.co.uk/webster/F/49
<chemistry, physics> The emission of one or more photons by a molecule or atom activated by the absorption of a quantum of electro magnetic radiation. ... Typically the emission, that is of longer wavelength than the excitatory radiation, occurs within 10exp 8 seconds: phosphorescence is a phenomenon with a longer or much longer delay in re r...Found on http://www.encyclo.co.uk/local/20973
(fldbobr-res´әns) the property of emitting light while exposed to light, the wavelength of the emitted light being longer than that of the absorbed light. fluorescence microscopy the use of a fluorescence microscope to identify microorganisms or specific tissue constituents th...Found on http://www.encyclo.co.uk/local/21001
• (n.) That property which some transparent bodies have of producing at their surface, or within their substance, light different in color from the mass of the material, as when green crystals of fluor spar afford blue reflections. It is due not to the difference in the color of a distinct surface layer, but to the power which the substance ha...Found on http://thinkexist.com/dictionary/meaning/fluorescence/
(from the article `analysis`) ...the lower electron orbital without inverting its spini.e., without changing the direction in which the electron rotates in the presence of a ... ...(light of essentially one `colour`i.e., composed of a very narrow range of frequencies). As the light is tuned across the frequency ran...Found on http://www.britannica.com/eb/a-z/f/40
luminescence observed only during irradiation NOTE - Luminescence is defined in 845-04-18.Found on http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=394-38-60
photoluminescence in which the emitted optical radiation results from direct transitions from the photo-excited energy level to a lower level, these transitions taking place generally within 10 nanoseconds after the excitationFound on http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=845-04-20
luminescence that occurs essentially only during irradiationFound on http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=881-02-81
Fluorite showing fluorescence under UV light A form of luminescence in which a substance emits visible light almost immediately after it has been stimulated or excited by electromagnetic radiation of a different wavelength or by certain other means (such as electrons striking the surface of a T...Found on http://www.daviddarling.info/encyclopedia/F/fluorescence.html
fluorescence (floores'uns) , luminescence in which light of a visible color is emitted from a substance under stimulation or excitation by light or other forms of electromagnetic radiation or by certain other means. The light is given off only while the stimulation continues; in this the phenome...Found on http://www.infoplease.com/ce6/sci/A0818998.html
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