R. Balda et al., CR3-]ND3+ ENERGY-TRANSFER IN FLUOROPHOSPHATE GLASS INVESTIGATED BY TIME-RESOLVED LASER SPECTROSCOPY(), Physical review. B, Condensed matter, 48(5), 1993, pp. 2941-2948
Energy transfer between chromium and neodymium ions in a mixed fluorop
hosphate glass [21.74Al(PO3)3-57.8BaF2-16.96 AlF3] has been investigat
ed in the 4.2-300 K temperature range by using steady-state and time-r
esolved laser spectroscopy. Radiative and nonradiative energy transfer
has been demonstrated from the time-resolved emission spectra and the
decrease of the Cr3+ lifetimes. Comparison between time-resolved emis
sion spectra for Cr3+ singly doped and codoped samples with different
Nd3+ concentrations shows that the radiative transfer is linearly depe
ndent on Nd3+ concentration. The nonradiative energy transfer is consi
stent with an electric-dipole-electric-dipole interaction mechanism. G
ood agreement is found if transfer efficiency corrected for Nd-Nd self
-quenching is compared with the measured sensitized Nd3+ luminescence.
The transfer efficiency of a Cr3+, Nd3+ system in the investigated fl
uorophosphate glass has also been compared with previous results in a
pure fluoride glass giving a higher efficiency for the fluorophosphate
glass if the Nd2O3 concentration is kept below 2 wt %.