Abstract
Energy transfer between chromium and neodymium ions in a mixed fluorophosphate glass [21.74Al(-57.-16.] has been investigated in the 4.2–300 K temperature range by using steady-state and time-resolved laser spectroscopy. Radiative and nonradiative energy transfer has been demonstrated from the time-resolved emission spectra and the decrease of the lifetimes. Comparison between time-resolved emission spectra for singly doped and codoped samples with different concentrations shows that the radiative transfer is linearly dependent on concentration. The nonradiative energy transfer is consistent with an electric-dipole–electric-dipole interaction mechanism. Good agreement is found if transfer efficiency corrected for Nd-Nd self-quenching is compared with the measured sensitized luminescence. The transfer efficiency of a , system in the investigated fluorophosphate glass has also been compared with previous results in a pure fluoride glass giving a higher efficiency for the fluorophosphate glass if the concentration is kept below 2 wt %.
- Received 21 April 1993
DOI:https://doi.org/10.1103/PhysRevB.48.2941
©1993 American Physical Society