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greenflash
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Is the term "fluorescence" limited to emission of visible light? (If the emitted light is IR, would this not be fluorescence?)
In many demonstrations, UV light is absorbed and visible light is emitted, but is absorption of UV an essential feature of fluorescence? Or could it also be a visible-to-visible change like blue light (higher-energy visible) absorbed, some of this EM energy converted into lower-energy EM or other forms (heat,...), and then red light (lower-energy visible) emitted?
GF
In many demonstrations, UV light is absorbed and visible light is emitted, but is absorption of UV an essential feature of fluorescence? Or could it also be a visible-to-visible change like blue light (higher-energy visible) absorbed, some of this EM energy converted into lower-energy EM or other forms (heat,...), and then red light (lower-energy visible) emitted?
GF
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