A wavelength shifter is a photofluorescent material that absorbs higher frequency photons and emits lower frequency photons. In most cases, the material absorbs one photon, and emits multiple lower-energy photons. These materials can be used to increase the efficiency of a photovoltaic cell (solar cell) by changing one `too-high` energy photon i.....
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http://en.wikipedia.org/wiki/Wavelength_shifter
(from the article `radiation measurement`) ...such as toluene, or as a plastic, in which the fluor is dissolved in a monomer that is subsequently polymerized. Frequently, a third component is ...
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http://www.britannica.com/eb/a-z/w/16
photofluorescent compound used with a scintillating material to absorb photons and emit photons of a longer wavelength NOTE - The purpose is to obtain more efficient use of the photons by a photomultiplier tube or photocell.
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=394-30-03
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