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dc.contributor.authorLovisa, L. X.
dc.contributor.authorAndrés, Juan
dc.contributor.authorGracia Edo, Lourdes
dc.contributor.authorLi, Maximu S.
dc.contributor.authorPaskocimas, C. A.
dc.contributor.authorBomio, M. R. D.
dc.contributor.authorAraújo, Vinícius Dantas
dc.contributor.authorLongo, Elson
dc.contributor.authorMotta, F. V.
dc.identifier.citationLOVISA, L. X., et al. Photoluminescent properties of ZrO 2: Tm 3+, Tb 3+, Eu 3+ powders—A combined experimental and theoretical study. Journal of Alloys and Compounds, 2017, vol. 695, p. 3094-3103.ca_CA
dc.description.abstractRare-earth (RE) element-based materials for optical applications have received increasing attention owing to the emission properties of RE ions, which render these materials suitable for use in color displays, lasers, and solid-state lighting. In the present work, ZrO2:RE (RE = Tm3+, Tb3+, and Eu3+) powders were obtained via complex polymerization, and characterized by means of X-ray diffraction (XRD), Raman spectroscopy, UV–visible absorption spectroscopy, and photoluminescence measurements. The XRD patterns and Raman spectra revealed the tetragonal phase of ZrO2 co-doped with up to 4 mol.% RE3+ and stabilization of the cubic phase, for up to 8 mol.% RE3+. In addition, the photoluminescence measurements revealed simultaneous emissions in the blue (477 nm), green (496.02 nm and 548.32 nm), and red-orange (597.16 nm and 617.54 nm) regions. These emissions result from the Tm3+, Tb 3+, and Eu3+ ions, respectively. Energy transfers, such as 1G4 levels (Tm3+) → 5D4 (Tb3+) and 5D4 levels (Tb3+) → 5D0 (Eu3+), occurred during the emission process. Calculations based on density functional theory (DFT) were performed, to complement the experimental data. The results revealed that structural order/disorder effects were generated in the cubic and tetragonal ZrO2 phases in the ZrO2:Eu3+ powders, and changes in the electronic structure were manifested as a decrease in the band gap values. The chromaticity coordinates of all the samples were determined from the PL spectrum. The coordinates, x = 0.34 and y = 0.34, of the ZrO2:8%RE sample corresponded to a point located in the white region of the CIE diagram and color correlated temperature (CCT) was found to be 5181 K. More importantly, the present results indicate that ZrO2:RE powders constitute promising photoluminescent materials for use in new lighting devices.ca_CA
dc.description.sponsorShipThe authors gratefully acknowledge the financial support of the Brazilian governmental research funding agencies CAPES, CNPq 402127/2013-7, FAPESP2013/07296-2 and INCTMN2008/57872-1.ca_CA
dc.format.extent9 p.ca_CA
dc.relation.isPartOfJournal of Alloys and Compounds Volume 695, February 2017ca_CA
dc.rights© 2016 Elsevier B.V. All rights reserved.ca_CA
dc.subjectDFT calculationsca_CA
dc.subjectWhite LEDsca_CA
dc.titlePhotoluminescent properties of ZrO2: Tm3+, Tb3+, Eu3+ powdersd-A combined experimental and theoretical studyca_CA

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