Fluorescence


MP.6(1) - Fluorescent Liquids Set


One can demonstrate how fluorescence is dependent on the wave length of light presented. Five different colors can be observed when UV light is used.

 

 

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MP.6(2) - Fluorescent Minerals Set

This is a sample of five different minerals, which fluoresces under ultraviolet light.

 

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MP.6(3) - Phosphorescence

Phosphorescence is a specific type of photoluminescence related to fluorescence, but unlike fluorescence, a phosphorescent material does not immediately re-emit the radiation it absorbs. The slower time scales of the re-emission are associated with "forbidden" energy state transitions in quantum mechanics. Since these transitions occur less often in certain materials, absorbed radiation may be re-emitted at a lower intensity for up to several hours. A blue laser (405 nm) can be used to demonstrate this effect on a phosphorescent screen.

Click here to see a video of this demo.

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