Fluorescent dyes can absorb ultraviolet light and then convert it to visible light of longer wavelengths. But a dye absorbs visible light and then emits ultraviolet cannot be possible.
Fluorescence can be described as the emission of light by a substance that has absorbed electromagnetic radiation. The emitted light has a longer wavelength, and therefore a lower energy of photon than the absorbed radiation.
Fluorescence occurs when the radiation from the ultraviolet region of the electromagnetic spectrum is absorbed, while the emitted light is in the visible region. The fluorescent substance has a distinct color when the substance has been exposed to UV light.
Fluorescent materials stop glowing immediately when the radiation source is removed, unlike phosphorescent materials, which continue to emit light for some time after the radiation source stops.
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