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

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+)...

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Principais autores: 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
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Idioma:English
Publicado em: Elsevier
Assuntos:
RE
Photoluminescence
DFT calculations
White LEDs
Endereço do item:https://repositorio.ufrn.br/handle/123456789/32242
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spelling ri-123456789-322422021-04-18T09:06:17Z 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 RE Photoluminescence DFT calculations White LEDs 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. 2021-04-16T14:39:37Z 2021-04-16T14:39:37Z 2017-02-25 article 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. 0925-8388 https://repositorio.ufrn.br/handle/123456789/32242 10.1016/j.jallcom.2016.11.341 en Attribution 3.0 Brazil http://creativecommons.org/licenses/by/3.0/br/ application/pdf Elsevier
institution Repositório Institucional
collection RI - UFRN
language English
topic RE
Photoluminescence
DFT calculations
White LEDs
spellingShingle RE
Photoluminescence
DFT calculations
White LEDs
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
description 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.
format article
author 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
author_facet 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
author_sort Paskocimas, Carlos Alberto
title Photoluminescent properties of ZrO2: Tm3+, Tb3+, Eu3+ powders — A combined experimental and theoretical study
title_short Photoluminescent properties of ZrO2: Tm3+, Tb3+, Eu3+ powders — A combined experimental and theoretical study
title_full Photoluminescent properties of ZrO2: Tm3+, Tb3+, Eu3+ powders — A combined experimental and theoretical study
title_fullStr Photoluminescent properties of ZrO2: Tm3+, Tb3+, Eu3+ powders — A combined experimental and theoretical study
title_full_unstemmed Photoluminescent properties of ZrO2: Tm3+, Tb3+, Eu3+ powders — A combined experimental and theoretical study
title_sort photoluminescent properties of zro2: tm3+, tb3+, eu3+ powders — a combined experimental and theoretical study
publisher Elsevier
publishDate 2021
url https://repositorio.ufrn.br/handle/123456789/32242
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