Quantification of the resonant energy transfer processes in Er3+/Yb3+ co-doped Ca3Al2Si3O12 glasses

The resonant cross relaxation processes between Yb3+ and Er3+ ions in calcium alumino-silicate glasses have been quantified under selective excitation. infrared emission spectra, measured steady state conditions (CW excitation to the 4I9/2 erbium level), allowed obtain an experimental relationship linking transfer (Yb3+ → Er3+) back (Er3+ Yb3+) parameters. These measurements combined with dynamics of main emitting levels, pulsed 2H11/2 level, fully quantification energy obtained values, C25=5.5×10−18cm3s−1 Er3+), C52=1.5×10−18cm3s−1 C27=7.6×10−18cm3s−1 (up-conversion mechanism, estimated from Judd-Ofelt analysis previously reported), can be used predict temporal evolution luminescent bands.