Mostrar el registro sencillo del ítem
Photoluminescent properties of ZrO2: Tm3+, Tb3+, Eu3+ powdersd-A combined experimental and theoretical study
dc.contributor.author | Lovisa, L. X. | |
dc.contributor.author | Andres, Juan | |
dc.contributor.author | Gracia, Lourdes | |
dc.contributor.author | Li, Maximo Siu | |
dc.contributor.author | Paskocimas, C. A. | |
dc.contributor.author | Bomio, M. R. D. | |
dc.contributor.author | Araújo, Vinícius Dantas | |
dc.contributor.author | Longo, Elson | |
dc.contributor.author | Motta, F. V. | |
dc.date.accessioned | 2017-06-07T09:25:02Z | |
dc.date.available | 2017-06-07T09:25:02Z | |
dc.date.issued | 2017-02 | |
dc.identifier.citation | LOVISA, 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.identifier.uri | http://hdl.handle.net/10234/167902 | |
dc.description.abstract | Rare-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.sponsorShip | The 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.extent | 9 p. | ca_CA |
dc.format.mimetype | application/pdf | ca_CA |
dc.language.iso | eng | ca_CA |
dc.publisher | Elsevier | ca_CA |
dc.relation.isPartOf | Journal of Alloys and Compounds Volume 695, February 2017 | ca_CA |
dc.rights | © 2016 Elsevier B.V. All rights reserved. | ca_CA |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | * |
dc.subject | ZrO2:RE | ca_CA |
dc.subject | Photoluminescence | ca_CA |
dc.subject | DFT calculations | ca_CA |
dc.subject | White LEDs | ca_CA |
dc.title | Photoluminescent properties of ZrO2: Tm3+, Tb3+, Eu3+ powdersd-A combined experimental and theoretical study | ca_CA |
dc.type | info:eu-repo/semantics/article | ca_CA |
dc.identifier.doi | https://doi.org/10.1016/j.jallcom.2016.11.341 | |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | ca_CA |
dc.relation.publisherVersion | http://www.sciencedirect.com/science/article/pii/S0925838816338245 | ca_CA |
dc.type.version | info:eu-repo/semantics/submittedVersion | ca_CA |
Ficheros en el ítem
Este ítem aparece en la(s) siguiente(s) colección(ones)
-
QFA_Articles [825]
Articles de publicacions periòdiques