THE ENHANCEMENT OF THE 6P(7/2) FLUORESCENCE OF Gd(3+) IN SrF2 CONTAINING Ce(3+) AS A CODOPANT.
Technical rept., 1 Jan 67-1 Jul 69,
DAYTON UNIV OHIO RESEARCH INST
Pagination or Media Count:
In this report the influence of an additional impurity ion, Ce3, on the 6P72 fluorescence of Gd3 in SrF2 is examined. Seven samples containing 0.1 mole percent Gd3 and different concentrations of Ce3 ranging from 0.01 to 1.0 mole percent were studied. The enhancement of the Gd3 fluorescence observed for increasing Ce3 concentration is attributed to non-radiative energy transfer between Ce3 and Gd3. Relative quantum efficiencies of transfer are reported for the spectra associated with both excitations. The quantum efficiency of transfer for 2500 A excitation is an order of magnitude higher than that for 2750 A. The spectrum observed under 2750 A excitation is predominantly that of the tetragonal site. However, the spectrum observed under 2500 A excitation is previously unobserved. It is tentatively identified as a monoclinic site. The relatively high quantum efficiency of transfer and the proposed model for the symmetry site monoclinic observed under 2500 A excitation suggest exchange as the dominant mechanism of transfer. The transfer mechanism for the sites involved in the spectrum observed under 2750 A excitation cannot be identified from this data, although it is probably some combination of multipolar transfer mechanisms. Author
- Atomic and Molecular Physics and Spectroscopy
- Solid State Physics