Europium - Periodic Table of Videos
The team at periodicvideos has created a TED-Ed Lesson for every element of the periodic table. Europium is element number 63 on the periodic table.
Europium fluorescence is used for anti-counterfeiting in Euro banknotes. When these notes are exposed to UV light parts should glow red because of Europium. Banknote-counting machines can automatically detect any forgery by the absence of this fluorescence.