Structure and luminescence properties of some new AgLnW2O8 compounds
Abstract
Three new compounds, AgLnW
2
O
8
(Ln
3+
=Eu, Gd or Tb), have been prepared by a solid-state
reaction and crystallize with a scheelite-related monoclinic symmetry.
Their IR spectra show absorption transitions in the region 1000–400
cm
-1
similar to KLnW
2
O
8
. Broad
excitation and emission bands of the tungstate group with a large Stokes
shift (12 573 cm
-1
) are observed in
AgGdW
2
O
8
. Excitation and emission spectra of
AgLnW
2
O
8
(Ln=Eu or Tb) show that energy transfer
from tungstate to Eu and Tb occurs and that Eu
3+
ions occupy a
unique crystallographic site with C
2
site
symmetry.
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