Difference between revisions of "Luminescence"

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== Description ==
 
== Description ==
  
An emission of light from energy changes that do not involve heat. Some luminescent materials are called [http://cameo.mfa.org/materials/fullrecord.asp?name=phosphor phosphors]. When luminescent materials are activated by the absorption of light (i.e., photoluminescence), their electrons can move from the ground level to an elevated energy level. Later when the electron falls back to its original orbital, a photon of light is emitted. When the time difference between excitation and emission is less than 1/100,000 of a second, then the luminescence is called [http://cameo.mfa.org/materials/fullrecord.asp?name=fluorescence fluorescence]. If the length of time is greater then the luminescence is called [http://cameo.mfa.org/materials/fullrecord.asp?name=phosphorescence phosphorescence]. Examples are light from the firefly, fluorescent lamp tubes, and television screens.  Other types of luminescence include; bioluminescence, [http://cameo.mfa.org/materials/fullrecord.asp?name=cathodoluminescence cathodoluminescence], [http://cameo.mfa.org/materials/fullrecord.asp?name=chemoluminescence chemoluminescence], crystalloluminescence, radioluminescence, [http://cameo.mfa.org/materials/fullrecord.asp?name=thermoluminescence thermoluminescence], and triboluminescence.
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An emission of light from energy changes that do not involve heat. Some luminescent materials are called [[phosphor|phosphors]]. When luminescent materials are activated by the absorption of light (i.e., photoluminescence), their electrons can move from the ground level to an elevated energy level. Later when the electron falls back to its original orbital, a photon of light is emitted. When the time difference between excitation and emission is less than 1/100,000 of a second, then the luminescence is called [[fluorescence]]. If the length of time is greater then the luminescence is called [[phosphorescence]]. Examples are light from the firefly, fluorescent lamp tubes, and television screens.  Other types of luminescence include; bioluminescence, [[cathodoluminescence]], [[chemoluminescence]], crystalloluminescence, radioluminescence, [[thermoluminescence]], and triboluminescence.
  
 
== Synonyms and Related Terms ==
 
== Synonyms and Related Terms ==

Revision as of 14:26, 21 January 2014

Description

An emission of light from energy changes that do not involve heat. Some luminescent materials are called phosphors. When luminescent materials are activated by the absorption of light (i.e., photoluminescence), their electrons can move from the ground level to an elevated energy level. Later when the electron falls back to its original orbital, a photon of light is emitted. When the time difference between excitation and emission is less than 1/100,000 of a second, then the luminescence is called fluorescence. If the length of time is greater then the luminescence is called phosphorescence. Examples are light from the firefly, fluorescent lamp tubes, and television screens. Other types of luminescence include; bioluminescence, cathodoluminescence, chemoluminescence, crystalloluminescence, radioluminescence, thermoluminescence, and triboluminescence.

Synonyms and Related Terms

photoluminescence; fluorescence; phosphorescence; luminosity; bioluminescence; cathodoluminescence; chemiluminescence; crystalloluminescence; radioluminescence; thermoluminescence; triboluminescence; luminescens (Dan., Nor.); Lumineszenz (Deut.); luminescence (Fr.); luminescentie (Ned.); luminescencja (Pol.); luminiscens (Sven.); luminescência (Port.)

Authority

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Book and Paper Group, Paper Conservation Catalog, AIC, 1984, 1989
  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998

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