It is one of the most important phosphors in modern technology.
One of the first scientific investigations of the luminescence exhibited by rotting wood or flesh and by glowworms, known from antiquity, was performed in 1672 by bioluminescent systems: that the light is cold; that it can be inhibited by chemical agents such as alcohol, hydrochloric acid, and ammonia; and that the light emission is dependent on air (as later established, on oxygen).
In all these phenomena, light emission does not result from the material being above room temperature, and so luminescence is often called cold light.
When hot materials become luminous and radiate light, a process called incandescence, the atoms of the material are in a high state of agitation.
On the other hand, at very high temperatures, such as are generated in shock tubes, the collisions of atoms can be so violent that electrons dissociate from the atoms and recombine with them, emitting light: in this case luminescence and incandescence become indistinguishable.colours because they absorb white light and reflect that part of the spectrum that is complementary to the absorbed light.
A small fraction of the absorbed light is transformed into heat, but no appreciable radiation is produced.
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Suess effect on biomarkers used to determine sediment provenance from land-use changes.