Among the possible REs europium (Eu3+) is one of the most
investigated and is also one of the best optically active elements.
The optical properties of trivalent Eu3+ ion are well known to be
highly sensitive to environment in which it is surrounded. The
selection of Eu3+ ions are a deserving candidate for the study of
disordered materials, because of its relatively simple energy level
structure with non- degenerate ground 7F0 and emitting 5D0 states.
Though there is enough information available on Eu3+ doped
borate glasses, it is interesting to find out the variation of properties
of Eu3+ ions in fluoroborate glasses by changing the chemical
composition. The addition of an extra cations to the glass network
exerts an influence on the glass structure leading to the local
change of the bridging oxygen (BO) and non bridging oxygen
(NBO) distribution