Spectroscopic investigations of Dy3+ doped borogermanate glasses for laser and wLED applications

Gökçe, Melis; Koçyiğit, Deniz

doi:10.1016/j.optmat.2019.02.004

Cited by 66 publications

(11 citation statements)

References 40 publications

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“…H-0.5Dy-yAg glasses have high transmittance of 80%-92% range as presented in the transmission spectra (figure 3(a)). This result reveals that all titled glasses are convenient for white light applications [17]. The absorption spectra of prepared glasses with and without silver in the UV-Vis-NIR region are plotted in figure 3 [22,30].…”

Section: Transmittance and Absorption Spectramentioning

confidence: 72%

“…For localized electronic states, the charge density enlarges generally over the NBOs or other defects. Consequently, the increase in the number of NBOs elicits a shift in the valance band maximum to higher energies and, in turn, decreases the band gap [17,47].…”

Section: Transmittance and Absorption Spectramentioning

confidence: 99%

“…The method formed by encapsulating two or three different types of phosphors excited with the blue chip can be used to handle this problem. Although higher CRI values can be achieved with this method, it is limited by the difficulty of preparation conditions and low emitting-color stability [16,17]. Also, encapsulation material can damage under harsh conditions such as high temperature, high energy and high excitation.…”

Section: Introductionmentioning

confidence: 99%

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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 Spectramentioning

confidence: 72%

Section: Transmittance and Absorption Spectramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…The proper combination of yellow and blue luminescence bands can produce white light. The yellow to blue luminescence intensity ratio can be adjusted by varying the glass-host [53], the pumping wavelengths [54] and the dysprosium ion concentration [55].…”

Section: Glassesmentioning

confidence: 99%

Lead Borate Glasses and Glass-Ceramics Singly Doped with Dy3+ for White LEDs

Górny¹,

Kuwik²,

Pisarski³

et al. 2020

Materials

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In this paper, some series of lead borate glasses and glass ceramics singly doped with Dy3+ ions were prepared and then studied using spectroscopic techniques. Our research includes mainly studies of the luminescence properties of received materials for white light. The luminescence bands associated with the characteristic 4F9/2→6H15/2 (blue), 4F9/2→6H13/2 (yellow) and 4F9/2→6H11/2 (red) transitions of trivalent dysprosium in lead borate systems are well observed. In particular, the Commission Internationale de I’Eclairage (CIE) chromaticity coordinates (x, y) were calculated in relation to potential applications for white light-emitting diodes (W-LEDs). Their values depend on the relative B2O3/PbO ratios and PbX2 contents (where X = Cl, F, Br) in glass composition. For glass-ceramics, the chromaticity coordinates are changed significantly under different excitation wavelengths.

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“…Compounds containing network formers are widely used in various industries, in particular for the production of nonlinear optical laser systems, phosphors, light emitting diodes and microporous materials. Of great interest in such industries are borogermanates and germanosilicates [1][2][3][4][5][6][7][8][9][10][11][12]. Materials having specified physicochemical properties can be obtained by entering into the structure of crystals and glasses capable of forming their own sublattices in various ratios of Ge, B, and Si atoms.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of thermodynamic properties of alkaline borogermanates and germanosilicates using the regression analysis method

Штенберг¹,

Bychinsky²,

Tupitsyn³

et al. 2020

International Journal of Thermodynamics

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A novel method for calculating the thermodynamic properties of ternary oxides using borogermanates and germanosilicates as examples is proposed. Using regression coefficients obtained for germanates, borates and silicates, the heat capacity, formation enthalpy, entropy and Gibbs free energy of alkaline borogermanates and germanosilicates were calculated. The obtained enthalpy of formation values are in good agreement with experimental data. In the regression equation, the alkaline oxide thermodynamic potential coefficients were found to depend on the class of compound.

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Spectroscopic investigations of Dy3+ doped borogermanate glasses for laser and wLED applications

Cited by 66 publications

References 40 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

Lead Borate Glasses and Glass-Ceramics Singly Doped with Dy3+ for White LEDs

Evaluation of thermodynamic properties of alkaline borogermanates and germanosilicates using the regression analysis method

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Spectroscopic investigations of Dy3+ doped borogermanate glasses for laser and wLED applications

Cited by 66 publications

References 40 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

Lead Borate Glasses and Glass-Ceramics Singly Doped with Dy3+ for White LEDs

Evaluation of thermodynamic properties of alkaline borogermanates and germanosilicates using the regression analysis method

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Product

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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