Structural and optical properties of Gd+3 doped Bi2O3–GeO2 glasses and glass-ceramics

Gökçe, Melis; Koçyiğit, Deniz

doi:10.1088/2053-1591/aaee53

Cited by 9 publications

(7 citation statements)

References 45 publications

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“…Molar volume (Vm) initially decreased but increased depending on the concentration of Gd2O3. BiTeGd-1 glass with the minimum molar volume confirmed polymerization in this glass network [8]. The number density of Gd 3+ ions increased with the increase in Gd2O3 concentration.…”

Section: Physical Propertiesmentioning

confidence: 55%

Impact of Gd2O3 Incorporation in Structural, Optical, Thermal, Mechanical, and Radiation Blocking Nature in HMO Boro-Tellurite Glasses

D’Souza,

Sayyed,

Kamath

2024

2023 IEEE 5th Eurasia Conference on Biomedical Engineering, Healthcare and Sustainability

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Section: Physical Propertiesmentioning

confidence: 55%

Impact of Gd2O3 Incorporation in Structural, Optical, Thermal, Mechanical, and Radiation Blocking Nature in HMO Boro-Tellurite Glasses

D’Souza,

Sayyed,

Kamath

2024

2023 IEEE 5th Eurasia Conference on Biomedical Engineering, Healthcare and Sustainability

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“…Where α, hγ and A are the absorption coefficient, the incident energy, and the energy constant, respectively. The electronic transition parameter (n) includes different values depending on the nature of the electronic transition, where n = 2 and 1/2 are correlated with the allowed indirect and direct electronic changes, respectively [39,40].…”

Section: Optical Absorption Studymentioning

confidence: 99%

“…Where pdπ is about one in perovskite structure [39,40,42,56]. Thus, the table 2 displays the values of r d and η calculated using equations (7) and (8).…”

Section: ( ) ( ) ( )mentioning

confidence: 99%

Tunable energy bandgap of Fe-doped (Bi, Li) co-substituted barium titanate

Ali,

Alkathy,

Suresh

et al. 2024

Phys. Scr.

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In this work, a polycrystalline Ba0.96(½ Bi, ½ Li)0.04Ti(1-x) FexO3; (0 ≤ x ≤ 0.08) ceramics have been synthesised using a solid-state reaction method. The prepared systems were explored to detect the impact of Fe substitution on the energy bandgap of the ceramics. XRD patterns confirmed that there is a structural phase transition from tetragonal (P4mm) to hexagonal (P63/mmc) phase as the concentration of Fe increases. Rietveld refinement was performed to obtain the lattice information. Furthermore, Raman spectroscopic analysis confirmed the structural information obtained from XRD study. The average bond length variations, strain evolutions, crystallite size, and theoretical density have been calculated from the structural analysis. It is found that the lower Fe concentration with the tetragonal phase showed a strong Jahn-Teller effect. Meanwhile, the higher concentration of Fe led to phase transition to hexagonal phase with fewer structural distortions. The optical band gap species were investigated through UV-Vis. Following the onset of defects induced by acceptor ions, an exciting band gap reduction up to 2.09 eV for the sample with x = 0.08 was attained. ESR and PL spectroscopies analyses showed that in the hexagonal phase region more defects are formed giving rise to promoting band gap narrowing. Furthermore, the ac conductivity analysis indicates the appearance of defect levels due to the formation of oxygen vacancies. This study demonstrates that the right choice of Fe content in the host material can tune the energy band gap significantly in the BLBTF system and may be exploited in photovoltaics in the visible region.

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“…The optical band gap energy (E g ) and Urbach energy (∆E) provides valuable information in the investigation of electronic band structure, disorder and optical transitions of amorphous materials for photonic applications [42,43]. The optical band gap and Urbach energy of H-0.5Dy-yAg glasses has been determined from absorption spectra using relevant equations expressed in the literature [7,44,45]. The indirect E g values, enlisted in table 3, were obtained from linear region of the Tauc's plot as presented in figure 3(c).…”

Section: Transmittance and Absorption Spectramentioning

confidence: 99%

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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Structural and optical properties of Gd⁺³ doped Bi₂O₃–GeO₂ glasses and glass-ceramics

Cited by 9 publications

References 45 publications

Impact of Gd2O3 Incorporation in Structural, Optical, Thermal, Mechanical, and Radiation Blocking Nature in HMO Boro-Tellurite Glasses

Impact of Gd2O3 Incorporation in Structural, Optical, Thermal, Mechanical, and Radiation Blocking Nature in HMO Boro-Tellurite Glasses

Tunable energy bandgap of Fe-doped (Bi, Li) co-substituted barium titanate

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

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Structural and optical properties of Gd+3 doped Bi2O3–GeO2 glasses and glass-ceramics

Cited by 9 publications

References 45 publications

Impact of Gd2O3 Incorporation in Structural, Optical, Thermal, Mechanical, and Radiation Blocking Nature in HMO Boro-Tellurite Glasses

Impact of Gd2O3 Incorporation in Structural, Optical, Thermal, Mechanical, and Radiation Blocking Nature in HMO Boro-Tellurite Glasses

Tunable energy bandgap of Fe-doped (Bi, Li) co-substituted barium titanate

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

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Structural and optical properties of Gd⁺³ doped Bi₂O₃–GeO₂ glasses and glass-ceramics

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