SHRIVASTAVA, NAVADEEPKHAN, L.U.KHAN, Z.U.VARGAS, J.M.MOSCOSO-LONDONO, O.OSPINA, CARLOSBRITO, H.F.JAVED, YASIRFELINTO, M.C.F.C.MENEZES, A.S.KNOBEL, MARCELOSHARMA, S.K.2017-10-092017-10-092017SHRIVASTAVA, NAVADEEP; KHAN, L.U.; KHAN, Z.U.; VARGAS, J.M.; MOSCOSO-LONDONO, O.; OSPINA, CARLOS; BRITO, H.F.; JAVED, YASIR; FELINTO, M.C.F.C.; MENEZES, A.S.; KNOBEL, MARCELO; SHARMA, S.K. Building block magneto-luminescent nanomaterials of iron-oxide/ZnS@LaF3:Ce3+,Gd3+,Tb3+ with green emission. <b>Journal of Materials Chemistry C</b>, v. 5, n. 9, p. 2282-2290, 2017. DOI: <a href="https://dx.doi.org/10.1039/c6tc05053k">10.1039/c6tc05053k</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/27861.2050-7526http://repositorio.ipen.br/handle/123456789/27861The preparation of novel triply-doped bifunctional Fe3O4/ZnS@LaF3:xCe3+,xGd3+,yTb3+ (x = 5; y = 5, 10 and 15 mol%) nanocomposites with efficient optical and magnetic features has been reported. The ZnS semiconductor functionalized Fe3O4 particles were coated with LaF3:RE3+ materials via a chitosanassisted co-precipitation method. The size of iron oxide B7.2 nm and trigonal structures of bifunctional nanostructures were confirmed through X-ray diffraction and high-resolution transmission electron microscopy. The static magnetic measurements supported and manifested the superparamagnetic behavior of the materials at 300 K. A broad emission band was observed in the blue region (400–550 nm) due to the sulphur vacancy on the surface of the Fe3O4/ZnS nanocomposite. For a triply doped bifunctional nanostructure, the excitation spectra revealed broad absorption bands centered at around 270 nm, which were attributed to the 4f(7F7/2) - 5d interconfigurational transition of the Ce3+ ion accompanied by narrow absorption lines arising from the 4f–4f intraconfigurational transitions of the Tb3+ ion. The emission spectra of the nanocomposites showed characteristic narrow emission lines assigned to the 5D4 - 7FJ transitions (J = 6–0) of the Tb3+ ion. The energy transfer process from the Ce3+ - Gd3+ - Tb3+ ions has also been presented and discussed. Furthermore, the structural, photoluminescence and magnetic properties of Fe3O4/ZnS@LaF3:RE3+ suggested that it may be an efficient candidate for magnetic light-converting molecular devices (MLMCDs) and high energy radiation detection.2282-2290closedAccessfluorescencenmr imagingiron oxidesbuildingsbuilding materialsnanoparticleszinc sulfideslanthanum fluoridescerium ionsgadolinium ionsterbium ionsnanocompositesArtigo de periódico9510.1039/c6tc05053khttps://orcid.org/0000-0001-7028-087886.04