Europium-Doped Sol-Gel SiO2-Based Glasses: Effect of the Europium Source and Content, Magnesium Addition and Thermal Treatment on Their Photoluminescence Properties

Fneich, Hussein; Gaumer, Nathalie; Chaussedent, Stéphane; Blanc, Wilfried; Mehdi, Ahmad

doi:10.3390/molecules23071768

Cited by 16 publications

(7 citation statements)

References 47 publications

(73 reference statements)

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“…We note that the thermal treatment increased the adsorbed quantity of the N 2 for the 10 nm SiNP, whereas it was reduced for the SiNP of sizes close to 50 nm and greater than 100 nm, which is related to the inter-grain porosity. Table 2 shows the surface areas measured by the BET method and the pore volumes of the 1% Eu-doped SiNP and, for comparison, those obtained for the 1% Eu-doped silica bulks studied and discussed earlier [ 25 ]. Before thermal treatment, the surface area of the SiNP of 10 and 50 nm sizes was lower than with 100 nm SiNP, probably due to a higher agglomeration rate of the smallest particles.…”

Section: Resultsmentioning

confidence: 99%

“…As in Eu-doped silica bulk [ 25 ], all samples show decays that are not simple exponentials. Rather than trying to fit these curves by means of several exponentials, which is difficult to interpret, we preferred to focus our attention on the comparison between samples in evaluating an average lifetime for each of them.…”

Section: Resultsmentioning

confidence: 99%

“…All measurements were performed with a photon-counting device (Stanford Research Systems, Sunnyvale, CA, USA) at room temperature. The decay curves were carried out around the maximum of the emission line of europium, with a temporal window width of 10.24 μs [ 25 ].…”

Section: Characterization Techniquesmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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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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“…However, the broad size distribution of vitreous nanoparticles does not discriminate between the role of their composition and their size on the luminescent properties, as already reported for crystalline nanoparticles. In this context, Mehdi et al described the europium and magnesium ions confinement in silica nanoparticles and their luminescent properties before and after annealing at 900 • C [12]. The sol-gel process remains as one of the most important approaches for the preparation of such nanoparticles with a diameter larger than 50 nm using the Stöber method.…”

Section: Optical Propertiesmentioning

confidence: 99%

Sol-Gel Chemistry: From Molecule to Functional Materials

Clément

Mehdi

2020

Molecules

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“…silicate glasses, phosphate glasses offer distinct advantages in fibre communication applications. Additionally, these glasses find valuable applications in the biomedical field due to their exceptional properties such as biocompatibility and dissolution rate, among others [4][5][6].…”

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confidence: 99%

Structural, luminescent and in vitro studies of europium‐doped soda lime phosphate glasses

Priya,

Kaur,

Attri

et al. 2023

Luminescence

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In this article, we have reported the effect of varying concentration of europium (Eu) in (50 − x)% P2O5–25% Na2O–24% CaO–% Eu2O3, where x = 1, 3, 5. The glass samples were synthesised via conventional melt‐quench method. The impact of europium ion (Eu3+) on the structural, optical and luminescent properties of phosphate soda lime glasses has been studied using X‐ray diffraction (XRD), Fourier‐transformed infrared (FTIR) spectroscopy, ultraviolet‐visible spectroscopy, scanning electron microscopy coupled with energy‐dispersive spectroscopy and photoluminescent techniques. The amorphous nature of glass samples was confirmed by XRD patterns. FTIR confirmed the presence of various functional groups. The emission spectra of synthesised samples exhibited intense emission peaks corresponding to Eu3+ under excitation at 393 nm. Among all the peaks, the maximum intensity was observed for 5D0 → 7F2 transition. Judd–Ofelt (J–O) parameters (Ω2, Ω4) and other radiative parameters such as band width, radiative transition probabilities, stimulated emission cross‐sections and branching ratio were determined from emission spectra. The other photometric parameters such as CIE coordinates and colour purity were also determined. Furthermore, cytotoxic studies were carried out on normal cell line human embryonic kidney cells (HEK‐293) using MTT assay. Results showed that the prepared samples significantly enhanced growth in glass sample‐treated cells as compared to control cells. These findings suggest that synthesised glass samples are biocompatible in nature and have potential for applications in display devices and biomedical research area.

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Europium-Doped Sol-Gel SiO2-Based Glasses: Effect of the Europium Source and Content, Magnesium Addition and Thermal Treatment on Their Photoluminescence Properties

Cited by 16 publications

References 47 publications

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

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

Sol-Gel Chemistry: From Molecule to Functional Materials

Structural, luminescent and in vitro studies of europium‐doped soda lime phosphate glasses

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