School of Physics Lecture Demonstration Manual

Oi-1 Fluorescence

Published: Wednesday 15 March 2006 - Updated: Monday 28 March 2011


To demonstrate fluorescence: i.e. Certain excited atoms will emit a photon of lower energy than the incident photon that caused the transition. If the process takes place rapidly (< 10 ^-7 sec) it is called Fluorescence.



Click on pictures to enlarge.

Fluoresence Diagram


Various materials are available that fluoresce under the action of the strong ultraviolet source.

These include

There is also a set of tubes that illustrate the action of fluorescent discharge tubes: these are

  1.  Uncoated Mercury discharge tube
  2.  Mercury discharge tube half coated with white fluorescent powder
  3.  Fluorescent tubes coated with fluorescent powders
    •  Green
    •  Blue
    •  Fluorescent powder representing different colour temperatures

Safety notes

Electrical safety 

Chemical safety 


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