The advantage of luminescence of the complexes of rare earth ion and organic compounds are:high intensity of luminescence

narrow wave peak

bright color

good stable character

little decline in light

hard to be oxidized

and so on.Because of these advantages

the complexes of rare earth ion and organic compounds are widely used.The fluorescence increment effect of rare earth ion and organic compounds

such as Gd

3+

La

3+

and Y

3+

can enhance the luminescence intensity of the certer ion of complexes

and provides scientific basis of further research and use of luminescence of rare earth complex compounds.Synthesis of the iso-polynucleus by the fluorescence increment effect has become an important subject in the field.In this paper

the iso-polynucleus complexes of Eu(Ⅲ)are synthesized based on fluorescence increment effect of rare earth.The complexes are characterized by element analysis

plasma spectra

IR spectra and fluorescence spectra.It has been confirmed that the addition of Gd

3+

La

3+

and Y

3+

can give a great improvement on the fluorescence intensity of center Eu

3+

in the complexes and it was reduced that the centent of Eu in the complexes and production cost.The influence of acidity on luminescence and the influence of temperature on luminescence while forming the complexes are also discussed in this paper.