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Issue 9, 2017
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Building block magneto-luminescent nanomaterials of iron-oxide/ZnS@LaF3:Ce3+,Gd3+,Tb3+ with green emission

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Abstract

The 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 chitosan-assisted co-precipitation method. The size of iron oxide ∼7.2 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 5D47FJ 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.

Graphical abstract: Building block magneto-luminescent nanomaterials of iron-oxide/ZnS@LaF3:Ce3+,Gd3+,Tb3+ with green emission

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Supplementary files

Article information


Submitted
21 Nov 2016
Accepted
25 Jan 2017
First published
25 Jan 2017

J. Mater. Chem. C, 2017,5, 2282-2290
Article type
Paper

Building block magneto-luminescent nanomaterials of iron-oxide/ZnS@LaF3:Ce3+,Gd3+,Tb3+ with green emission

N. Shrivastava, L. U. Khan, Z. U. Khan, J. M. Vargas, O. Moscoso-Londoño, C. Ospina, H. F. Brito, Y. Javed, M. C. F. C. Felinto, A. S. Menezes, M. Knobel and S. K. Sharma, J. Mater. Chem. C, 2017, 5, 2282
DOI: 10.1039/C6TC05053K

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