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) Abstract:The bi-rare earth complexes EuTb(m-MBA)6(phen)2*2H2O, TbY(m-MBA)6(phen)2*2H2O were synthesized by the reaction of RECl3 with m-methylbenzoic acid and 1,10-phenanthroline in ethanol solution, where... by europium ion in EuTb(m-MBA)6(phen)2*2H2O; the emission intensity from terbium ion can be greatly enhanced by yttrium ion in TbY(m-MBA)6(phen)2*2H2O. The mechanism about the results was discussed......