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Luminescence
A luminescent light source is usually
cooler than an incandescence source. It is cooler because it absorbs energy in
some form other than heat. The color of a luminescent source does not depend on
its temperature. An example of a luminescent source would be a florescent light
that makes use of chemical compounds called phosphors. This clearly shows that
luminescent light absorbs energy in other forms than heat. Fluorescent light
tubes contain mercury vapor and outside that it’s coated on the inside with
phosphors. When electricity passes through the tube it makes the mercury atoms
excited, and it give off blue, green, violet, and ultra violet light. The
electrons in the phosphor absorb the ultraviolet radiation, and then it releases
some energy to make heat, before emitting visible light that we can see.
Phosphor
compounds are also used to convert electron energy to light in a television.
When the phosphor collides if the beams of electrons in the tube it makes small
dots. This process can be used in the television to depict dot to combine and
form the picture.
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