Photoluminescent properties of ZrO2: Tm3+, Tb3+, Eu3+ powders — A combined experimental and theoretical study

Paskocimas, Carlos Alberto; Lovisa, Laura Ximena; Andrés, Juan; Gracia, Lourdes; Li, Maximo Siu; Delmonte, Maurício Roberto Bomio; Araújo, Vinícius Dantas; Silva, Elson Longo da; Motta, Fabiana Villela da

Photoluminescent properties of ZrO2: Tm3+, Tb3+, Eu3+ powders — A combined experimental and theoretical study

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dc.contributor.author	Paskocimas, Carlos Alberto
dc.contributor.author	Lovisa, Laura Ximena
dc.contributor.author	Andrés, Juan
dc.contributor.author	Gracia, Lourdes
dc.contributor.author	Li, Maximo Siu
dc.contributor.author	Delmonte, Maurício Roberto Bomio
dc.contributor.author	Araújo, Vinícius Dantas
dc.contributor.author	Silva, Elson Longo da
dc.contributor.author	Motta, Fabiana Villela da
dc.date.accessioned	2021-04-16T14:39:37Z
dc.date.available	2021-04-16T14:39:37Z
dc.date.issued	2017-02-25
dc.description.resumo	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.	pt_BR
dc.identifier.citation	LOVISA, L.X.; ANDRÉS, J.; GRACIA, L.; LI, M.s.; PASKOCIMAS, C.A.; BOMIO, M.R.D.; ARAUJO, V.D.; LONGO, E.; MOTTA, F.V.. Photoluminescent properties of ZrO2: tm3+, tb3+, eu3+ powders⠴a combined experimental and theoretical study. Journal Of Alloys And Compounds, [S.L.], v. 695, p. 3094-3103, fev. 2017. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S0925838816338245?via%3Dihub. Acesso em: 11 dez. 2020. http://dx.doi.org/10.1016/j.jallcom.2016.11.341.	pt_BR
dc.identifier.doi	10.1016/j.jallcom.2016.11.341
dc.identifier.issn	0925-8388
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/32242
dc.language	en	pt_BR
dc.publisher	Elsevier	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	RE	pt_BR
dc.subject	Photoluminescence	pt_BR
dc.subject	DFT calculations	pt_BR
dc.subject	White LEDs	pt_BR
dc.title	Photoluminescent properties of ZrO2: Tm3+, Tb3+, Eu3+ powders — A combined experimental and theoretical study	pt_BR
dc.type	article	pt_BR