Energy transfer in rare earth (RE)-organic complexes materials and their luminescence properties have obtained extensive attention in the recent years. Studies of luminescence regarding to polymer compelxes of RE are particularly interesting. We have demonstrated that the energy transfer from the bpy (2

2’-bipyri-dine) to the central Ce

3+

ion for the Ce

3+

-bpy complex solution and reported that the complexation of Ce

3+

with the polemers and the fluores cence properties of the compexes in the preceding papers.In this paper

we described relation between the excitation process of Ce

3+

fluorescence and the structures for the two complexes. The polymer complexes of Ce

3+

are Ce

3+

-polymethylmethacrylate

Ce

3+

-PMMA and Ce

3+

-poly-(2-methacryloyloxymethy-1

4

7

10

13

16-hexaoxacyclotodecane)

Ce

3+

-PMAl8·C·6

respectively.