Abstract
Rare-earth-rich fluoroarsenate glasses were synthesized in the Na 2O, As 2O 5, BaF 2, YF 3 system. Physical constants are given for the most stable compositions. The effects of neodymium ions in the (40Na 4As 2O 7–30BaF 2–30YF 3) mol% glass were investigated in terms of emission spectroscopy and lifetime measurements as a function of temperature and concentration. Time-resolved line-narrowed fluorescence spectra of the 4F 3/2 → 4I 9/2 transition show that energy transfer occurs between non-resonant sites. A quantitative measure of the transfer as a function of time indicates that a dipole–dipole mechanism dominates. In addition, the transfer rate is found to increase with increasing excitation energy, that is with increasing number of possible energy acceptors.
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