New experimental and theoretical approach in Eu2O3 microspheres: From synthesis to a study of the energy transfer

Viana, Rodrigo da Silva; Falcão, Eduardo H.L.; Dutra, José Diogo L.; Costa, Nivan B. da; Freire, Ricardo O.; Alves, Severino

doi:10.1016/j.jphotochem.2013.11.001

Cited by 10 publications

(5 citation statements)

References 45 publications

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“…The 5 D 0 → 7 F 4 transition was not investigated in some Eu 3+ ‐doped CaP bioceramics previously studied, while it was reported in others . Our hypothesis is that this peculiar emission centred around 700 nm arises mostly from Eu substituted as dopant in the CaP matrix rather than from the oxide, as this feature is completely different from that reported for europium in Eu 2 O 3 , which generally presents a much weaker 5 D 0 → 7 F 4 (if compared to 5 D 0 → 7 F 2 ) and no relevant signal at 687 nm. However, it is important to remark that our systems include a mixture of different phases; therefore a definitive attribution of these transitions is extremely difficult due to the inability to analyze each single phases individually.…”

Section: Resultscontrasting

confidence: 60%

Luminescent calcium phosphate bioceramics doped with europium derived from fish industry byproducts

Piccirillo

Adamiano

Tobaldi³

et al. 2017

J Am Ceram Soc

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The recovery of valuable compounds from byproducts is at present a priority topic for social, environmental, and economic reasons. In this work we report for the first time the preparation of luminescent calcium phosphate (CaP) bioceramics from waste codfish bones. Codfish bones were treated in aqueous Eu(NO 3 ) 3 solutions of different concentrations, followed by thermal treatment at either 700°C or 1100°C. The resulting materials consisted of hydroxyapatite (HAp), b-tricalcium phosphate (b-TCP) and a small amount of Eu 2 O 3 . Chemical and structural characterization showed that the Eu ions were successfully introduced into the bones and, hence, in the thermally treated CaP phases obtained from them, although mainly in the b-TCP lattice. Photoluminescence investigation revealed that all the materials are luminescent, with samples treated at 1100°C having more intense luminescence than those prepared at 700°C. In vitro evaluation of cell-materials interaction indicated that all the samples displayed good cytocompatibility toward osteoblast cells. This work demonstrates that a simple and effective process, employing Eu as a dopant, can convert fish industry byproducts into highly valuable luminescent CaP bioceramics, having potential applications in biology and medicine for bio-imaging. K E Y W O R D S b-tricalcium phosphate, calcium phosphates, europium, luminescence, waste valorisation Present address

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Section: Resultscontrasting

confidence: 60%

Luminescent calcium phosphate bioceramics doped with europium derived from fish industry byproducts

Piccirillo

Adamiano

Tobaldi³

et al. 2017

J Am Ceram Soc

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“…However, thermal treatment does not cause crystallization of any sample. There is no presence of peaks corresponding to Eu 2 O 3 crystals, normally represented as an intense diffraction peak around 2θ = 29 • and two less intense peaks around 2θ = 33 • and 47 • [28,29]. This observation is consistent with a good dilution of europium ions in the SiNP.…”

Section: Resultssupporting

confidence: 76%

The Effect of Size and Thermal Treatment on the Photoluminescent Properties of Europium-Doped SiO2 Nanoparticles Prepared in One Pot by Sol-Gel

et al. 2021

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Europium (Eu)-doped silica nanoparticles have attracted great interest for different applications, in particular in biomedicine as biosensors or for tissue regeneration. Sol-gel is the most common process used to prepare those particles, with size varying from tens to hundreds of nanometers. In this article, we focus our attention on the comparison between two commonly used sol-gel derived methods: reverse microemulsion (for particles smaller than 100 nm) and Stöber method (for particles larger than 100 nm). Europium concentration was varied between 0.2 and 1 mol%, and the nanoparticle diameters were 10, 50 and 100 nm. The link between the local environment of europium ions and their optical properties was investigated and discussed. Using Transmission Electron Microscopy, nitrogen sorption, X-ray diffraction, Fourier-Transform Infra-Red and pulsed doubled Nd:YAG laser, we confirmed that fluorescence lifetime was improved by thermal treatment at 900 °C due to the elimination of aqueous environment and modification of structure disorder. The size of nanoparticles, the amount of europium and the thermal treatment of obtained materials influence the emission spectra and the decay curves of Eu3+.

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“…For the samples synthesized at temperatures below 860 • C, the main emission band is observed at 612 nm. Before the formation of the CaYAlO 4 phase, the Eu 3+ ions appear to be dominantly hosted by the Y 2 O 3 phase or Eu 2 O 3 itself under the detection limit of XRD-the Eu 3+ 5 D 0 → 7 F 2 transition in Y 2 O 3 and Eu 2 O 3 has been observed near 610 nm [36][37][38][39].…”

Section: Resultsmentioning

confidence: 99%

Influence of Ga Substitution on the Local Structure and Luminescent Properties of Eu-Doped CaYAlO4 Phosphors

Kim

Kang

et al. 2023

Inorganics

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Understanding the local environment of luminescent centers in phosphors serves as a blueprint for designing the luminescent properties of phosphors. Chemical substitution is a general strategy for engineering the local structure around luminescent center ions. In this study, we systematically investigate the luminescent properties of Ga-substituted Eu-doped CaYAlO4 (CYAGO:Eu) phosphors and the local structure of the Eu ions. The Ga substitution at the Al sites leads to a significant enhancement in the electric dipole transition of Eu3+ (5D0 → 7F2). The Judd–Ofelt analysis reveals that Eu3+ ions are substituted for Ca/Y, and the Ga substitution increases the asymmetricity of the local structure around the Eu ions because of the different ionic radii and electronegativities of Al and Ga. In addition, Eu2+ emission is missing regardless of the Ga substitution and post-hydrogen treatments. The present work provides deeper insight into the role of chemical substitution in oxide phosphors.

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New experimental and theoretical approach in Eu2O3 microspheres: From synthesis to a study of the energy transfer

Cited by 10 publications

References 45 publications

Luminescent calcium phosphate bioceramics doped with europium derived from fish industry byproducts

Luminescent calcium phosphate bioceramics doped with europium derived from fish industry byproducts

The Effect of Size and Thermal Treatment on the Photoluminescent Properties of Europium-Doped SiO2 Nanoparticles Prepared in One Pot by Sol-Gel

Influence of Ga Substitution on the Local Structure and Luminescent Properties of Eu-Doped CaYAlO4 Phosphors

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