Impact of Ag species on luminescence and spectroscopic properties of Eu3+ doped fluoro-phosphate glasses

Ennouri, Marwa; Gelloz, Bernard; Elhouichet, Habib

doi:10.1016/j.jnoncrysol.2021.120938

Cited by 14 publications

(7 citation statements)

References 54 publications

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“…The cut-off edge wavelength (λ cut-off ) values, which limit the transmittance at low wavelengths and result from electronic transitions, shifted to higher wavelengths with the increase of Ag concentration. This result points out the successful incorporation of Ag ions in the glass host [40,41].…”

Section: Transmittance and Absorption Spectrasupporting

confidence: 52%

“…The radiative decay time (τ rad ) values were found to be higher than the experimental decay time (τ exp ) values, owing to the non-radiative transitions of Dy 3+ ions in the glass matrix [8,17]. As evident from table 11, τ exp values were found to increase with Ag content up to 1.0 wt% and then luminescence quenching occurs at higher Ag concentrations, confirming ET between Ag species and Dy 3+ ions [41].…”

Section: Decay Analysismentioning

confidence: 81%

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Luminescence characteristics of Dy³⁺ doped sodium alumina borate glass: Role of silver

Koçyiğit

Gökçe

2023

J. Phys. D: Appl. Phys.

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Metallic nanoparticle doped glasses have been studied as promising candidates for various technological applications due to their ability to improve the luminescence properties of rare earth ions. In this work, Dy2O3 and Ag2O co-doped sodium alumina borate glasses were synthesized by conventional melt-quenching technique. Raman analysis verified the existence of [BO3] and [BO4] groups with B–O stretching vibrations in the prepared glasses. Transmission electron microscope images confirmed the presence of spherical Ag nanoparticles, whose average diameter is about 7.60 nm, in H-0.5Dy1Ag glass matrix. The optical and luminescence properties were investigated according to Ag concentrations. The negative value of the bonding parameters, calculated from the absorption spectra, indicates the ionic nature between the Dy3+ ions and its surrounding ligands. In order to determine the nature of the Dy-O bond and the symmetry around the Dy3+ ion environment, Judd–Ofelt intensity parameters (Ωλ, λ=2, 4, 6) were obtained from the absorption spectra. The luminescence spectra obtained under 350 nm excitation exhibits four emission bands at 481 (4F9/2→6H15/2), 572 (4F9/2→6H13/2), 662 (4F9/2→6H11/2), and 750 (4F9/2→6H9/2) nm. The intensity of emission spectra increases with Ag2O content until 1.0 wt% in H-0.5Dy-yAg glasses and then decreases due to the back-energy transfer from Dy3+ to Ag+. The energy transfer mechanism from Ag+ to Dy3+ ion for H-1Ag-xDy glasses were investigated through Forster-Dexter’s theory and were found to be quadrupole-quadrupole type. The various radiative properties were calculated by using Judd-Ofelt intensity parameters and emission spectra. It was found that the 572 nm emission band, located in the yellow region, has higher radiative parameters. As a function of Ag concentration, the Y/B values, Commission Internationale d'Eclairage (CIE) chromaticity coordinates (x,y) and correlated color temperatures (CCT) were evaluated. The CIE chromaticity coordinates and CCT values of all glasses are located in the white light region. The decay time values of 1S0→3D1 transition of Ag+ ions and 4F9/2→6H13/2 transition of Dy3+ ions confirm the energy transfer from Ag+ to Dy3+ ions. Overall, the present study indicates that the synthesized glasses with Ag addition exhibits improved luminescence, making them potential candidate for wLEDs.

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Section: Transmittance and Absorption Spectrasupporting

confidence: 52%

Section: Decay Analysismentioning

confidence: 81%

Luminescence characteristics of Dy³⁺ doped sodium alumina borate glass: Role of silver

Koçyiğit

Gökçe

2023

J. Phys. D: Appl. Phys.

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“…In order to show the emission peaks related to Eu 3+ ions, we have chosen to excite the samples by the 405 nm wavelength. Figure 9 shows the well-known emission peaks assigned to the intra-4f shell transition 5 D 0 → 7 F j (j = 1-4) in Eu 3+ ion [41]. The observed peaks correspond to 5 D 0 → 7 F1 (at 591 nm), 5 D 0 → 7 F2 (at 615 nm), 5 D 0 → 7 F3 (at 650 nm) and 5 D 0 → 7 F4 (at 695 nm) [42].…”

Section: Luminescence Studymentioning

confidence: 99%

Improvement of Luminescence and Photocatalytic Performance of ZnO:Eu3+ Nanocrystals Activated by Na+ Ions

et al. 2023

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Undoped and codoped (Eu/Na) ZnO nanocrystals (NCs) were successfully manufactured through an economical sol-gel method. X-ray diffraction (XRD) analysis demonstrated pure hexagonal wurtzite structure without secondary phases for all the samples. The size of the NCs was found to decrease with codoping by Eu3+/Na+ which is related to the existence of strain and stress in the lattice. The dominance of the E2(high) mode in Raman spectra indicates the good crystallinity of the samples. The study from the X-ray photoelectron spectroscopy (XPS) shows the successful insertion of both Eu3+ and Na+ ions into the ZnO lattice and the generation of the zinc and oxygen vacancies (Vo) defects. The band gap energy was reduced and the Urbach energy increased with Na+ content, proving the distortion of the lattice. From the photoluminescence (PL) study, the activation of the Eu3+ ions by Na+ ones was evidenced. Longer PL lifetimes were obtained from Eu3+ ions when they were sensitized by Na+, which may be beneficial to several applications. A process of excitation transfer from both the ZnO host and Na+ sensitizers to the Eu3+ ions was evidenced and discussed. As an application, we tested the performances of the prepared NCs as photocatalysts for Rhodamine B photodegradation under sunlight irradiation. The ZnO NCs codoped with 1% Eu/4% Na displayed the best photodegradation rate with a good stability and a high kinetic rate constant k of 0.021 min−1. The photocatalytic mechanism is discussed in terms of longer radiative recombination from Eu3+ and the generated oxygen vacancies.

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“…Only more recently, the possibility of using oxyfluoride glasses [ 3 ] was demonstrated as they have advantages for the production of fibers, films, and other forms when compared to other materials [ 3 , 4 ]. Since then various glassy compositions have been reported in the literature as potential materials to host Ag NCs, such as fluorophosphates [ 5 , 6 , 7 ], zinc borate [ 8 ] CABAl [ 9 ], oxyfluorides [ 10 , 11 ], borosilicates [ 12 , 13 ], and others. The corresponding applications presented in these reports include solar cells, flexible screen monitors, white light generation, tunable visible light emission sources, and CW lasers.…”

Section: Introductionmentioning

confidence: 99%

Silver Nanoclusters Tunable Visible Emission and Energy Transfer to Yb3+ Ions in Co-Doped GeO2-PbO Glasses for Photonic Applications

et al. 2023

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This work investigates the optical properties of Yb3+ ions doped GeO2-PbO glasses containing Ag nanoclusters (NCs), produced by the melt-quenching technique. The lack in the literature regarding the energy transfer (ET) between these species in these glasses motivated the present work. Tunable visible emission occurs from blue to orange depending on the Yb3+ concentration which affects the size of the Ag NCs, as observed by transmission electron microscopy. The ET mechanism from Ag NCs to Yb3+ ions (2F7/2 → 2F5/2) was attributed to the S1→T1 decay (spin-forbidden electronic transition between singlet–triplet states) and was corroborated by fast and slow lifetime decrease (at 550 nm) of Ag NCs and photoluminescence (PL) growth at 980 nm, for excitations at 355 and 405 nm. The sample with the highest Yb3+ concentration exhibits the highest PL growth under 355 nm excitation, whereas at 410 nm it is the sample with the lowest concentration. The restriction of Yb3+ ions to the growth of NCs is responsible for these effects. Thus, higher Yb3+ concentration forms smaller Ag NCs, whose excitation at 355 nm leads to more efficient ET to Yb3+ ions compared to 410 nm. These findings have potential applications in the visible to near-infrared regions, such as tunable CW laser sources and photovoltaic devices.

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Impact of Ag species on luminescence and spectroscopic properties of Eu3+ doped fluoro-phosphate glasses

Cited by 14 publications

References 54 publications

Luminescence characteristics of Dy³⁺ doped sodium alumina borate glass: Role of silver

Luminescence characteristics of Dy³⁺ doped sodium alumina borate glass: Role of silver

Improvement of Luminescence and Photocatalytic Performance of ZnO:Eu3+ Nanocrystals Activated by Na+ Ions

Silver Nanoclusters Tunable Visible Emission and Energy Transfer to Yb3+ Ions in Co-Doped GeO2-PbO Glasses for Photonic Applications

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Impact of Ag species on luminescence and spectroscopic properties of Eu3+ doped fluoro-phosphate glasses

Cited by 14 publications

References 54 publications

Luminescence characteristics of Dy3+ doped sodium alumina borate glass: Role of silver

Luminescence characteristics of Dy3+ doped sodium alumina borate glass: Role of silver

Improvement of Luminescence and Photocatalytic Performance of ZnO:Eu3+ Nanocrystals Activated by Na+ Ions

Silver Nanoclusters Tunable Visible Emission and Energy Transfer to Yb3+ Ions in Co-Doped GeO2-PbO Glasses for Photonic Applications

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Luminescence characteristics of Dy³⁺ doped sodium alumina borate glass: Role of silver

Luminescence characteristics of Dy³⁺ doped sodium alumina borate glass: Role of silver