| material which exhibits photoluminescence as the result of exposure to optical radiation Note 1 to entry: Photoluminescent materials absorb energy from optical radiation in the shorter wavelength regions of the visible spectrum and/or in the ultraviolet region and re-radiate some of this energy at longer wavelengths, producing narrow bands of emission in the visible region. Note 2 to entry: See also "fluorescent material", "daylight fluorescent colour".
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