The Luminescence Of Black Light
The Luminescence of Black Light
Black Light. What is it? It is a portion of the Ultra-Violet Spectrum
that is invisible to our eyes. We can not distinguish it. However, when this
radiation impinges on certain materials visible light is emitted and this is
known as "fluorescence." Fluorescence is visible to the human eye, in that it
makes an object appear to "glow in the dark."
There are several sources of ultra-violet light. These sources are: the
sun, carbon arcs, mercury arcs, and black lights. In most cases, the production
of ultra-violet light creates a reasonable amount of heat.
Many materials exhibit the peculiar characteristic of giving off light
or radiant energy when ultra-violet light is allowed to fall upon them. This is
called luminescence. In most cases, the wave length of the light radiated is
longer than that of the ultra-violet excitation but a few exceptions have been
found.
The quantum theory attempts to explain this property by contending that
a......
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