Building block magneto-luminescent nanomaterials of iron-oxide/ZnS@LaF3:Ce3+, Gd3+, Tb3+ with green emission. Issue 9 (14th February 2017)

• Record Type: Journal Article
• Authors: Shrivastava, Navadeep; Khan, L. U.; Khan, Z. U.; Vargas, J. M.; Moscoso-Londoño, O.; Ospina, Carlos; Brito, H. F.; Javed, Yasir; Felinto, M. C. F. C.; Menezes, A. S.; Knobel, Marcelo; Sharma, S. K.
• Is Part Of: Journal of materials chemistry. Volume 5:Issue 9(2017)
• Page Start: 2282
• Page End: 2290
• Publication Date: 2017-02-14
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6tc05053k
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : The bifunctional nanocomposite showing strong green emission of Tb 3+ ions under a UV lamp ( λ = 254 nm), with and without external magnetic field. Abstract : The preparation of novel triply-doped bifunctional Fe3 O4 /ZnS@LaF3 : x Ce 3+, x Gd 3+, y Tb 3+ ( x = 5; y = 5, 10 and 15 mol%) nanocomposites with efficient optical and magnetic features has been reported. The ZnS semiconductor functionalized Fe3 O4 particles were coated with LaF3 :RE 3+ 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 Fe3 O4 /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( 7 F7/2 ) → 5d interconfigurational transition of the Ce 3+ ion accompanied by narrow absorption lines arising from the 4f–4f intraconfigurational transitions of the Tb 3+ ion. The emission spectra of the nanocomposites showed characteristic narrow emission lines assigned to the 5 D4 → 7 FJ transitions ( J = 6–0) of the Tb 3+ ion. The energy transfer process from the Ce 3+ → Gd 3+ → Tb 3+ ions has also been presented and discussed. Furthermore, the structural, photoluminescence and magnetic properties of Fe3 O4 /ZnS@LaF3 :RE 3+ suggested that it may be an efficient candidate for magnetic light-converting molecular devices (MLMCDs) and high energy radiation detection.