Optical properties of Ce3+ and Tb3+ co-doped ZnS quantum dots

Ca, Nguyễn Xuân; Duy, Vinh Nguyen; Bharti, Shivani; Tan, P.M.; Hiền, Nguyễn Thị; Hòa, Vũ Xuân; Peng, Yuxin; Độ, Phan Văn

doi:10.1016/j.jallcom.2021.160764

Cited by 43 publications

(22 citation statements)

References 44 publications

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“…47,48 Thus, the chemical valence of Ba in Ba 2 Eu 3 B 27− δ O 46 can be confirmed to be +2. The Tb 3d spectrum provides two strong peaks occurring at 1278.15 and 1243.20 eV with an energy separation of ∼35 eV, which can be matched well with the Tb 3+ 3d 3/2 and Tb 3+ 3d 5/2 components, respectively, 49,50 while the XPS spectrum of the Eu 3d doublet shows two components centered at 1166.40 and 1136.45 eV. These peaks originate from Eu 3+ 3d 3/2 and Eu 3+ 3d 5/2 levels and the spin–orbit splitting energy of ∼30 eV is consistent with the literature.…”

Section: Resultsmentioning

confidence: 54%

Two new rare-earth borates Sr₂Tb₃B_27−δO₄₆ and Ba₂Eu₃B_27−δO₄₆ (δ = 2/3): syntheses, crystal structures, and luminescence properties

et al. 2022

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Section: Resultsmentioning

confidence: 54%

Two new rare-earth borates Sr₂Tb₃B_27−δO₄₆ and Ba₂Eu₃B_27−δO₄₆ (δ = 2/3): syntheses, crystal structures, and luminescence properties

et al. 2022

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“…From Figure 3d, it can be seen that the presence of Tb is detected near 1241.6 and 1276.8 eV in the modified 0.7TF-LRNMO sample, indicating that Tb is doping the material surface in the form of a + 3 valence. 40 As shown in Figure 3e, the peaks at 529.5, 531.1, and 532.2 eV correspond to lattice oxygen, oxygen vacancies, and adsorbed oxygen, respectively. 41 From the bar graph in Figure 3f, it is evident that the oxygen vacancy concentration of the modified 0.7TF-LRNMO sample has increased from 0.2 to 0.423 compared to that of the LRNMO sample.…”

Section: Resultsmentioning

confidence: 95%

Enabling Ultrastable Co-Free Li-Rich Oxides via TbF₃ Treatment

Li,

Song,

Zhang

et al. 2024

ACS Appl. Mater. Interfaces

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Co-free Li-rich Mn-based cathode materials (Co-free LRMOs) have become one of the most promising cathode materials in lithium-ion batteries for the next generation due to their low cost, high capacity, and environmental friendliness. Under high voltage, redox reactions involving anions can easily lead to various issues, including oxygen release, dissolution of transition metal elements (TMs), and structural collapse in these materials. The absence of the Co element further exacerbates this issue. Here, a simple one-step solid-phase reaction strategy is proposed to achieve nanoscale dual modification of the Co-free LRMOs with F and Tb doping. The dual modification has a relatively small impact on the cell parameters and Li + diffusion ability of the LRMOs, leading to no significant improvement in its rate performance. The modified LRMOs only exhibited discharge capacities of 220.7, 200.1, 140.0, 115.5, and 90.9 mAh•g −1 at 0.1, 0.2, 1.0, 2.0, and 5.0 C, respectively. However, the modified Co-free LRMOs exhibit extremely strong structural stability and retain 95.1% of the initial capacity after 300 cycles, so far, the highest capacity retention rates among all Ni/Mn-based Li-rich materials. Mechanism studies have shown that the enhancement in structural stability of the Co-free LRMOs is attributed to the increased concentration of oxygen vacancies and Ni 3+ ions through F doping. Furthermore, Tb doping not only hinders the release of O 2 but also enhances the Li + migration and electronic conductivity coefficient of the LRMOs.

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“…The calculated value of the band gap of pristine ZnS nanoparticles is 4.19 eV which is certainly higher than the band gap of cubic ZnS in bulk form (3.67 eV) [11,26]. This rise in band gap for nanoparticles of ZnS is attributed to the quantum confinement effect [37]. The band gap further is observed to increase up to ZnS:Ga 10% then it decreased for ZnS:Ga 12% (table 4).…”

Section: Optical Studymentioning

confidence: 85%

ZnS nanoparticles: role of Ga³⁺ ions substitution on the structural, morphological, optical, and dielectric properties

Kapoor

Kumar

et al. 2023

Phys. Scr.

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Due to their dynamic features, nanoparticles of semiconductor materials have been created rapidly in the past few decades and are being investigated for potential uses in a variety of disciplines. The present study focuses on the substitution of Ga3+ ions in ZnS nanoparticles to modify their structural, morphological, compositional, optical, and dielectric properties. The Ga-doped (ZnS:Ga) nanoparticles for various Ga3+ ions concentrations (i.e., 0%, 2%, 4%, 6%, 8%, 10% & 12%) are synthesized using direct co-precipitation technique and utilizing precursor solutions of Zn(CH3COO)2, Na2S and Ga2(SO4)3 along with EDTA as a stabilizing agent. The structural analysis reveals that the synthesized nanoparticles exhibit a cubic crystal structure with high crystallinity and preferred (111) orientation. Fluctuations in different structural parameters have been noticed without any alteration in crystal structure after the substitution of Ga ions in ZnS matrix. The surface morphology exposes spherical-shaped ZnS:Ga nanoparticles whose compactness varies with doping concentrations. FT-IR and EDS spectra of the nanoparticles identify the presence of different functional groups and elements in the expected compositions. A blueshift in the absorption edge has been observed for all the concentrations of ZnS:Ga w.r.t. pristine ZnS indicating quantum confinement in the synthesized nanoparticles which further results in the broadening of optical bandgap in comparison to bulk value for ZnS. The room temperature dielectric measurements for ZnS:Ga nanoparticles show a high dielectric constant value up to doping level 8% beyond which it decreased. The ac conductivity values in this study varied from 10-4 Ω-1m-1 for pristine to 9.66×10-3 Ω-1m-1 for ZnS:Ga 12%.

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Optical properties of Ce3+ and Tb3+ co-doped ZnS quantum dots

Cited by 43 publications

References 44 publications

Two new rare-earth borates Sr₂Tb₃B_27−δO₄₆ and Ba₂Eu₃B_27−δO₄₆ (δ = 2/3): syntheses, crystal structures, and luminescence properties

Two new rare-earth borates Sr₂Tb₃B_27−δO₄₆ and Ba₂Eu₃B_27−δO₄₆ (δ = 2/3): syntheses, crystal structures, and luminescence properties

Enabling Ultrastable Co-Free Li-Rich Oxides via TbF₃ Treatment

ZnS nanoparticles: role of Ga³⁺ ions substitution on the structural, morphological, optical, and dielectric properties

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Optical properties of Ce3+ and Tb3+ co-doped ZnS quantum dots

Cited by 43 publications

References 44 publications

Two new rare-earth borates Sr2Tb3B27−δO46 and Ba2Eu3B27−δO46 (δ = 2/3): syntheses, crystal structures, and luminescence properties

Two new rare-earth borates Sr2Tb3B27−δO46 and Ba2Eu3B27−δO46 (δ = 2/3): syntheses, crystal structures, and luminescence properties

Enabling Ultrastable Co-Free Li-Rich Oxides via TbF3 Treatment

ZnS nanoparticles: role of Ga3+ ions substitution on the structural, morphological, optical, and dielectric properties

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Two new rare-earth borates Sr₂Tb₃B_27−δO₄₆ and Ba₂Eu₃B_27−δO₄₆ (δ = 2/3): syntheses, crystal structures, and luminescence properties

Two new rare-earth borates Sr₂Tb₃B_27−δO₄₆ and Ba₂Eu₃B_27−δO₄₆ (δ = 2/3): syntheses, crystal structures, and luminescence properties

Enabling Ultrastable Co-Free Li-Rich Oxides via TbF₃ Treatment

ZnS nanoparticles: role of Ga³⁺ ions substitution on the structural, morphological, optical, and dielectric properties