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Type: Artigo
Title: Building Block Magneto-luminescent Nanomaterials Of Iron-oxide/zns@laf3:ce3+,gd3+,tb3+ With Green Emission
Author: Shrivastava
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.; Knobele
Marcelo; Sharma
S. K.
Abstract: The preparation of novel triply-doped bifunctional Fe3O4/ZnS@LaF3:xCe(3+),xGd(3+),yTb(3+) (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 similar to 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 nano-structure, the excitation spectra revealed broad absorption bands centered at around 270 nm, which were attributed to the 4f(F-7(7/2)) -> 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 D-5(4) - F-7(J) 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.
Subject: Up-conversion Luminescent
Iron-oxide Nanoparticles
Editor: Royal Soc Chemistry
Citation: Journal Of Materials Chemistry C. Royal Soc Chemistry, v. 5, p. 2282 - 2290, 2017.
Rights: fechado
Identifier DOI: 10.1039/c6tc05053k
Date Issue: 2017
Appears in Collections:Unicamp - Artigos e Outros Documentos

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