Spray pyrolysis synthesis and characterization of Mg1-xSrxMoO4 heterostructure with white light emission

• Published in: Journal of alloys and compounds Vol. 813; p. 152235
• Main Authors: Santiago, A.A.G., Tranquilin, R.L., Botella, P., Manjón, F.J., Errandonea, D., Paskocimas, C.A., Motta, F.V., Bomio, M.R.D.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 15.01.2020; Elsevier BV
• Subjects: Composition; Diodes; Emission spectra; Heterostructures; Inorganic materials; Light emission; Light emitting diodes; Light sources; Molybdate; Molybdates; Morphology; Nanoparticles; Phosphors; Photoluminescence; Raman spectra; Raman spectroscopy; Scheelite; Spectrum analysis; Spray pyrolysis; Synthesis; Ultrasonic spray pyrolysis; White emission; White light; White emission; Ultrasonic spray pyrolysis; Raman spectroscopy; Molybdate; Photoluminescence
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2019.152235

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 and trasmission 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). [Display omitted] •Mg1-xSrxMoO4 samples were obtained quickly and continuous.•The relationship between the structural and morphological changes were studied.•The PL emission spectra of the samples showed high-quality white emission.