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Spray pyrolysis synthesis and characterization of Mg1-xSrxMoO4 heterostructure with white light emission
LSQM, Laboratory of Chemical Synthesis of Materials, Department of Materials Engineering, Federal University of Rio Grande do Norte, UFRN, Natal, RN, Brazil.
LSQM, Laboratory of Chemical Synthesis of Materials, Department of Materials Engineering, Federal University of Rio Grande do Norte, UFRN, Natal, RN, Brazil.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0001-6930-8415
Instituto de Diseño para la Fabricación y Producción Automatizada, MALTA Consolider Team, Universitat Politècnica de València, València, Spain.
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2020 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 813, article id 152235Article in journal (Refereed) Published
Abstract [en]

Molybdates are inorganic materials with great potential in white phosphors application, being an alternative to traditional lighting sources. In this study, we report the synthesis and characterization of Mg1-xSrxMoO4 (x = 0, 0.25, 0.50, 0.75, and 1) powders with white light-emitting properties. Using X-ray diffraction, the formation of the monoclinic β-MgMoO4 phase was observed for x = 0 and the formation of the tetragonal scheelite phase of SrMoO4 was observed for x = 1. The formation of a heterostructure composed of both phases was found for compositions with x = 0.25, 0.50 and 0.75. Scanning electron microscopy images showed that the Mg1-xSrxMoO4 particles exhibit a spherical morphology formed by several primary nanoparticles. Raman scattering spectroscopy enabled the accurate identification of the Raman modes for different compositions and their assignment to either the SrMoO4 or β-MgMoO4 modes. The bandgap energies were determined to fluctuate between 4.25 eV and 4.44 eV, being influenced by the degree of structural disorder. The photoluminescence emission spectra of the nanoparticles showed neutral- and cool-white emission with high-quality white light (CRI > 80%). The samples synthesized with x ≤ 0.50 are potential materials for the application in LED lamps (6500 K) and pure white-light sources (5500 K).

Place, publisher, year, edition, pages
Elsevier, 2020. Vol. 813, article id 152235
Keywords [en]
Ultrasonic spray pyrolysis, Raman spectroscopy, Photoluminescence, Molybdate, White emission
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Experimental Physics
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URN: urn:nbn:se:ltu:diva-75975DOI: 10.1016/j.jallcom.2019.152235Scopus ID: 2-s2.0-85072037267OAI: oai:DiVA.org:ltu-75975DiVA, id: diva2:1350899
Note

Validerad;2019;Nivå 2;2019-09-20 (johcin)

Available from: 2019-09-12 Created: 2019-09-12 Last updated: 2019-09-20Bibliographically approved

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Botella, Pablo

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