Abstract
Two novel core-shell structure ternary terbium composites SiO(2(600))@Tb(MABA-Si)·L(L:dipy/phen) nanometre luminescence materials were prepared by ternary terbium complexes Tb(MABA-Si)·L(2)·(ClO(4))(3)·2H(2)O shell grafted onto the surface of SiO(2) microspheres. And corresponding ternary terbium complexes were synthesized using (CONH(CH(2))(3)Si(OCH(2)CH(3))(3))(2) (denoted as MABA-Si) as first ligand and L as second ligand coordinated with terbium perchlorate. The as-synthesized products were characterized by means of IR spectra, (1)HNMR, element analysis, molar conductivity, SEM and TEM. It was found that the first ligand MABA-Si of terbium ternary complex hydrolysed to generate the Si-OH and the Si-OH condensate with the Si-OH on the surface of SiO(2) microspheres; then ligand MABA-Si grafted onto the surface of SiO(2) microspheres. The diameter of SiO(2) core of SiO(2(600))@Tb(MABA-Si)·L was approximately 600 nm. Interestingly, the luminescence properties demonstrate that the two core-shell structure ternary terbium composites SiO(2(600))Tb(MABA-Si)·L(dipy/phen) exhibit strong emission intensities, which are 2.49 and 3.35 times higher than that of the corresponding complexes Tb(MABA-Si)·L(2)·(ClO(4))(3)·2H(2)O, respectively. Luminescence decay curves show that core-shell structure ternary terbium composites have longer lifetime. Excellent luminescence properties enable the core-shell materials to have potential applications in medicine, industry, luminescent fibres and various biomaterials fields.