School of Physics Lecture Demonstration Manual

Oi-2 Phosphorescence

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


To demonstrate that a phosphorescent material when irradiated with UV light will emit light of a lower energy for an appreciable interval of time.



It is quite dramatic to irradiate the phosphorescent powder together with some other fluorescent material. When the source is removed it is clearly seen that the phosphorescent powder emits light for an appreciable length of time (of the order of ten seconds).

Safety notes

Electrical safety 

Chemical safety 

Sharps safety 


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