2003•Unpublished venueRequires access
Preparation and fluorescence properties of rare earth(Eu~(3~)and La~(3+))complexes with citric acid and 1,10-phenanthroline
Xiao-Jun Sun
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Abstract
Rare earth binary complex Eu(Cit)·4H_2O,ternary complex Eu(Cit)·phen·2H_2O and(Eu- La)Cit·phen were synthesized.Many advanced approaches,such as element analysis,FTIR spectra,TG and DTA analysis,were used to determine their composition and structures.In addition,their fluorescent properties were studied by fluorescent spectra and lifetime.The results showed that the fluorescence was the strongest and the lifetime was the longest when the mole ratio of europium to lanthanum was 6:4.The results of fluorescent intensity were also fitted by mathematical tools.It showed that the degree of La~(3+)enhance Eu~(3+) fluorescence decreased by exponential Decay mode when Eu~(3+)content was among the range of 1:9～5:5 and decreased by linear decay mode when Eu~(3+)content was among the range of 6:4～9:1.