the emission of radiation, especially of visible light, by a substance during exposure to external radiation, as light or x-rays.: Compare phosphorescence (def. 1).
the property possessed by a substance capable of such emission.
the radiation so produced.
- non·fluo·res·cence, noun
- florescence, fluorescence
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use fluorescence in a sentence
Not applying selection simply meant propagating the populations forward at random regardless of their fluorescence.
In the second phase, Zheng and his colleagues applied the same selection pressure across all three populations in order to have them evolve toward increased green fluorescence.
The lead halide perovskite domains made by fluorescence microscopy.How a New Solar and Lighting Technology Could Propel a Renewable Energy Transformation | Sam Stranks | September 3, 2020 | Singularity Hub
A few weeks after the heat stress, this red fluorescence jumped.Going bright may help corals recover from bleaching | Carolyn Wilke | June 25, 2020 | Science News For Students
The glow is produced through a process is known as fluorescence.
This solution will show a characteristic blue fluorescence when quinin is present.A Manual of Clinical Diagnosis | James Campbell Todd
In other words, Grew seems to have observed the characteristic fluorescence of chlorophyll.
Anthracene is a white crystalline hydrocarbon, having a bluish fluorescence, melting at 213° C. and boiling above 360° C.Coal | Raphael Meldola
My Platinochloride develops octohedron crystals,—with a fine blue fluorescence.The Life and Letters of Lafcadio Hearn, Volume 1 | Elizabeth Bisland
Mineral oils have a characteristic bloom, showing a greenish fluorescence when examined by transmitted light.Paint Technology and Tests | Henry A. Gardner
British Dictionary definitions for fluorescence
the emission of light or other radiation from atoms or molecules that are bombarded by particles, such as electrons, or by radiation from a separate source. The bombarding radiation produces excited atoms, molecules, or ions and these emit photons as they fall back to the ground state
such an emission of photons that ceases as soon as the bombarding radiation is discontinued
such an emission of photons for which the average lifetime of the excited atoms and molecules is less than about 10 –8 seconds
the radiation emitted as a result of fluorescence: Compare phosphorescence
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for fluorescence
The giving off of light by a substance when it is exposed to electromagnetic radiation, such as visible light or x-rays. As long as electromagnetic radiation continues to bombard the substance, electrons in the fluorescent material become excited but return very quickly to lower energy, giving off light, always of the same frequency. Fluorescent dyes are often used in microscopic imaging, where different dyes can penetrate and illuminate different parts of the sample being examined, helping to distinguish its structures. Compare phosphorescence.
The light produced in this way.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Cultural definitions for fluorescence
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.