The evolution of the D-5(0) --> F-7(0) emission of Eu3+ ions in calcium dib
orate glasses has been analysed using time resolved fluorescence line narro
wing measurements in order to give a complete view of the energy transfer p
rocesses between these ions. At low concentration (2.5 mol% of Eu2O3) and e
xciting within the high energy side of the inhomogeneous F-7(0) --> D-5(0)
absorption band, the luminescence spectrum mainly consists of a narrow reso
nant peak that repeats the exciting profile, indicating that the migration
processes between Eu3+ ions within the D-5(0) level is not important. Howev
er, at higher concentrations (5 to 11.5 mol% of Eu2O3) the luminescence spe
ctrum contains not only a narrow emission but also a broad band due to ions
excited by energy transfer (background fluorescence), which for long times
well reproduces the inhomogeneous profile. The temporal evolution of the n
arrow band fluorescence and the shape of the background fluorescence have b
een analysed using a previously proposed model. The purpose is to understan
d the dynamics involved in the energy transfer processes caused by the inte
raction between Eu3+ ions and the implications in their luminescence. A ver
y good agreement with the experimental results is found taking into account
an energy dependent quadrupole-quadrupole (S = 10) non-radiative energy tr
ansfer process assisted by a phonon from Eu3+ ions at high crystal held sit
es to ions at low crystal field sites. The temperature dependence of the en
ergy transfer processes is analysed in the range from 13 to 60 K.