Preparation and fluorescence properties of rare earth (Eu~(3+) and Y~(3+)) complexes with benzoic acid and 1,10-phenanthroline

Rare earth binary complex Eu(BA)-3,ternary complex Eu(BA)-3·phen and(Eu-Y)BA-3·phen were synthesized.Many advanced approaches,such as element analysis and FTIR spectra,were used to determine their composition and structures.In addition,their fluorescent properties were studied by fluorescent spectra and lifetime.The results show that the fluorescence is the strongest and the lifetime is the longest when the mole ratio of europium to yttrium is 3∶7.The results of fluorescent intensity were also fitted by mathematical tools.It shows that the degree of Y~(3+) enhance Eu~(3+) fluorescence decreases by exponential decay mode when the content of Y~(3+) decreases.