Probing the optical and magnetic modality of multi core-shell Fe3O4@SiO2@?-NaGdF4:RE3+ (RE = Ce, Tb, Dy) nanoparticles

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dc.contributor.authorShrivastava, Navadeep
dc.contributor.authorOspina, Carlos
dc.contributor.authorJacinto, Carlos
dc.contributor.authorde Menezes, Alan S.
dc.contributor.authorMuraca, Diego
dc.contributor.authorJaved, Yasir
dc.contributor.authorKnobel, Marcelo
dc.contributor.authorLuo, Zhiping
dc.contributor.authorSharma, Surender Kumar
dc.date.accessioned2024-01-21T10:42:50Z
dc.date.accessioned2024-08-13T12:44:54Z
dc.date.available2024-01-21T10:42:50Z
dc.date.available2024-08-13T12:44:54Z
dc.date.issued2023-02-22T00:00:00
dc.description.abstractA robust yellowish-green emitting multi core-shell Fe3O4@SiO2@?-NaGdF4:RE3+ (RE = 5% Ce, 5% Tb, x% Dy; x = 1, 5 and 10 mol.%) nanoparticles (NPs) containing both magnetic and luminescence modalities, are synthesized using simple, fast and efficient microwave-assisted hydrothermal method. The Rietveld analysis of X-ray diffraction and high-resolution transmission electron microscopy provides an average crystallite size of ?30 nm, confirming the successful coating of the ?-NaGdF4 hexagonal phase over Fe3O4. The detailed photoluminescence investigation suggests a down-converting energy transfer process, Ce3+?Gd3+?Tb3+? Dy3+ in which Gd3+ ions play a significant intermediate role assisted by Tb3+. The excitation spectra consist of dominant broadband at ?252 nm due to Ce3+ (4f�5d), two sharp lines at ? 271 nm, and ?311 due to Gd3+ (8S7/2?6IJ and 6PJ), and frail f?f transitions due to Tb3+ and Dy3+ ions. The excitation at ?252 nm fetches weak and sharp emission of Gd3+ ions at 310 nm, weak broad emission of Ce3+ (300�400 nm), and strong emission color lines of RE3+ (400�700 nm) due to characteristic transitions of Tb3+ (5D4?7FJ, J = 6�3), and Dy3+ (4F9/2�6H15/2, 6H13/2), respectively. The quenching phenomenon is observed due to concentration, and back transfer energy is proposed. The magnetic hysteresis loops display superparamagnetic behavior at 300 K and ferromagnetic ordering at 2 K with a remarkable difference in their magnetization values and confirming the blocking temperatures around physiological temperature ranges. The magneto-luminescence characteristics of the bifunctional system can be easily manipulated under an external magnetic field and suggest an efficient candidate for hybrid medical imaging such as MRI plus X-ray imaging and radiation detection. � 2023 Elsevier B.V.en_US
dc.identifier.doi10.1016/j.optmat.2023.113585
dc.identifier.issn9253467
dc.identifier.urihttp://10.2.3.109/handle/32116/3749
dc.identifier.urlhttps://linkinghub.elsevier.com/retrieve/pii/S092534672300157X
dc.language.isoen_USen_US
dc.publisherElsevier B.V.en_US
dc.subjectMagnetic-luminescenceen_US
dc.subjectMagnetite quenchingen_US
dc.subjectMicrowave-assisted solvothermal methoden_US
dc.subjectRare-earth magnetism and luminescenceen_US
dc.titleProbing the optical and magnetic modality of multi core-shell Fe3O4@SiO2@?-NaGdF4:RE3+ (RE = Ce, Tb, Dy) nanoparticlesen_US
dc.title.journalOptical Materialsen_US
dc.typeArticleen_US
dc.type.accesstypeClosed Accessen_US

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