Text: When a phosphor or other luminescent substance emits light, it gives, in most cases, an emission according to a fundamental law known as Stokes' Law. This law states that the wavelength of the flourescent (emitted) light is always greater than the wave length of the exciting radiation. It was first observed in 1852 in the memoir "On the Change of Refrangibility of Light" by Sir G. G. Stokes. In terms of energy the relationship states e em

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