Rare earth (Dy3+-ion) induced near white light emission in sodium-zinc-borate glasses

Hemalatha, S; Nagaraja, M.; Madhu, A.; Srinatha, N.

doi:10.1016/j.rio.2022.100275

Cited by 24 publications

(5 citation statements)

References 47 publications

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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%

“…Furthermore, borate glasses have a large solubility capacity for rare earth (RE) ions [1,2]. These fabulous features make borate glasses useful in technological applications such as solid-state lightings, lasers, color displays, optoelectronic devices and sensors [3][4][5][6][7]. However, low absorption coefficient and converting efficiencies of RE ions lead to low photoluminescence (PL) excitation and emission intensities.…”

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: 99%

Section: Introductionmentioning

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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“…Zn 2 SiO 4 is recognized as a good candidate for hosting phosphors and optical materials thanks to its wide band gap, which allows for efficient light emission, chemical stability, and transparency in the UV-visible region [11][12][13]. The addition of an alkaline metal such as Na 2 O to the glass composition contributes to stabilization during melting by increasing its stiffness [14].…”

Section: Introductionmentioning

confidence: 99%

Effect of ZnO on Luminescence Performance of Terbium-Activated Zinc Borosilicate Glasses

Dayioglugil,

Solak

2024

Materials

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In this study, terbium-doped ZnO-SiO2-B2O3-Na2O glasses were fabricated with the conventional melt-quenching method. The effect of altering the concentration of the host matrix on luminescence performance was investigated in terms of different ZnO/B2O3 and ZnO/SiO2 ratios. FT-IR results indicate that bridging oxygens (Bos) were converted to non-bridging oxygens (NBOs) with increments of ZnO. Furthermore, the emission intensity and luminescence lifetime of samples were influenced by the amount of ZnO; this was proven with photoluminescence spectra results. The maximum emission intensity was observed at a 1.1 ZnO/B2O3 ratio and a 0.8 ZnO/SiO2 ratio; however, the highest luminescence lifetime was observed at a 1.1 ZnO/SiO2 ratio. The emission intensity and luminescence lifetime of glass samples were improved by heat treatment as a result of the formation of willemite and zinc oxide phases. An increase in the ZnO/SiO2 ratio facilitated the formation of willemite and zinc oxide phases; therefore, crystallinity was directly related to the luminescence behavior of glass samples.

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“…The growth of optical materials has led to many applications in photonic devices, including optical waveguides, solid-state lasers, display panels, solar cells, optical fibers, white light-emitting diodes (WLEDs), bioimaging, and biomedical applications. Borate glassy matrices are popular for glass forming and fluxing ingredients due to their excellent rare earth ion solubility, enhanced thermal stability, low melting point, greater UVvis light transparency, broad extent of structural units, and coordination number [1][2][3][4]. As a result, borate glass chips can be used by LEDs to emit visible light without the need for any organic binders.…”

Section: Introductionmentioning

confidence: 99%

Noncytotoxic Dy³⁺‐activated glass emits cool white light for near ultraviolet‐based white light‐emitting diodes, visible lasers, and biomedical applications

et al. 2023

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Using the melt quenching technique, a lithium zinc borate glass (LZB) system with trivalent dysprosium ions (Dy3+) was synthesized, and the luminescence and lasing properties of these materials were examined for the generation of white light. Structural investigation through X‐ray diffraction revealed that the prepared glass had an amorphous nature. The optimized glass containing 0.5 Dy3+ had a direct optical band gap of 2.782 eV and an indirect optical band gap of 3.110 eV. A strong excitation band at 386 nm (6H15/2→4I13/2) was recognized in the ultraviolet (UV) light region of its excitation spectrum. Emission bands could be seen in the photoluminescence spectrum at 659, 573, and 480 nm under the 386 nm excitation. These transitions of emission resembled electronic transitions such as (4F9/2→6H11/2), (4F9/2→6H13/2), and (4F9/2→6H15/2). In a pristine glass matrix, the higher intensity ratio of yellow to blue can result in the production of white light. The optimized Dy3+ ion concentration was observed to be 0.5 mol%. In addition, an analysis of lifetime decay was conducted for all synthesized glasses, and their decay trends were systematically investigated. Noticeably, we assessed the photometric parameters and found that they were close to the white light standard. Furthermore, a cytotoxicity study was carried out using lung fibroblast (WI‐38) cell lines for the optimized 0.5Dy3+‐doped LZB glass and it appeared to be noncytotoxic. It is clear from the results that the noncytotoxic LZB glass doped with 0.5 Dy3+ ions could be a suggestive choice for the manufacture of white light‐emitting diodes and lasers using near‐UVs.

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Rare earth (Dy3+-ion) induced near white light emission in sodium-zinc-borate glasses

Cited by 24 publications

References 47 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

Effect of ZnO on Luminescence Performance of Terbium-Activated Zinc Borosilicate Glasses

Noncytotoxic Dy³⁺‐activated glass emits cool white light for near ultraviolet‐based white light‐emitting diodes, visible lasers, and biomedical applications

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Rare earth (Dy3+-ion) induced near white light emission in sodium-zinc-borate glasses

Cited by 24 publications

References 47 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

Effect of ZnO on Luminescence Performance of Terbium-Activated Zinc Borosilicate Glasses

Noncytotoxic Dy3+‐activated glass emits cool white light for near ultraviolet‐based white light‐emitting diodes, visible lasers, and biomedical applications

Contact Info

Product

Resources

About

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

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

Noncytotoxic Dy³⁺‐activated glass emits cool white light for near ultraviolet‐based white light‐emitting diodes, visible lasers, and biomedical applications