Fluorescence is a special form of luminescence. Fluorescence is excited by radiation in an ultraviolet range. When the electrons of fluorescing molecules absorb photons, they attain a higher level of energy. This excited state is then energetically instable. The electrons quickly return to their initial condition, causing the previously absorbed energy to be released once again. This release of energy results in the emission of fluorescent light. Because some of the energy is transformed into heat, the emitted radiation has less energy, and therefore a longer wavelength.
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