Luminescence properties of YBO3}GdBO3 solid solutions doped with Tb3` have been investigated in order to
understand the energy transfer processes between Gd3` and Tb3` in these phosphors. The critical atomic fraction (X#
)
and the critical distance (R#
) for e$cient energy migration among Gd3` ions were derived. In YBO3}GdBO3 : Tb solid
solutions, (Gd3`}BO3~3 ) absorbs excitation energy more e$ciently than (Y3`}BO3~3 ) in the VUV region. ( 2000
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