Compositional dependence of red luminescence from Eu3+ ions doped single and mixed alkali fluoro tungsten tellurite glasses

Devi, Ch. B. Annapurna; Mahamuda, Sk.; Swapna, K.; Rao, A.S.; Prakash, G. Vijaya

doi:10.1016/j.optmat.2017.08.010

Cited by 31 publications

(5 citation statements)

References 45 publications

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“…An indication that Eu 3+ ions are distributed in a non-inversion symmetry sites in the glass host is the fact that the predominant emission is from the ED transition rather than from the MD transition. Therefore, the value of relative luminescent intensity ratio R of the two transitions ( 5 D 0 → 7 F 2 )/( 5 D 0 → 7 F 1 ) ( Table 3 ) gives information on the degree of asymmetry around the Eu 3+ ions [ 2 , 41 ]. The higher the value of the asymmetry parameter, the lower the local site symmetry of the active ion, and the higher Eu–O covalence and emission intensity.…”

Section: Resultsmentioning

confidence: 99%

“…Glasses accommodating rare-earth ions have been studied for years as luminescent materials in solid-state lasers, photonics, and opto-electronic devices like optical amplifiers, multicolor displays and detectors. Among them, glasses containing trivalent europium ion have been the subject of a great deal of interest due to its intense red emission [ 1 , 2 , 3 , 4 , 5 ]. Currently, heavy emphasis has been given to the discovery of new glass compositions for exploitation as Eu 3+ -doped luminescent hosts, as the optical properties of the active rare-earth ions in glasses strongly depend on the chemical composition of the glass matrix [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

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Structure and Luminescent Properties of Niobium-Modified ZnO-B2O3:Eu3+ Glass

Iordanova,

Milanova,

Yordanova

et al. 2024

Materials

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The effect of the addition of Nb2O5 (up to 5 mol%) on the structure and luminescent properties of ZnO-B2O3 glass doped with 0.5 mol% (1.32 × 1022) Eu2O3 was investigated by applying infrared (IR), Raman and photoluminescence (PL) spectroscopy. Through differential thermal analysis and density measurements, various physical properties such as molar volume, oxygen packing density and glass transition temperature were determined. IR and Raman spectra revealed that niobium ions enter into the base zinc borate glass structure as NbO4 tetrahedra and NbO6 octahedra. A strong red emission from the 5D0 level of Eu3+ ions was registered under near UV (392 nm) excitation using the 7F0 → 5L6 transition of Eu3+. The integrated fluorescence intensity ratio R (5D0 → 7F2/5D0 → 7F1) was calculated to estimate the degree of asymmetry around the active ion, suggesting a location of Eu3+ in non-centrosymmetric sites. The higher Eu3+ luminescence emission observed in zinc borate glasses containing 1–5 mol% Nb2O5 compared to the Nb2O5-free zinc borate glass evidences that Nb2O5 is an appropriate component for modifying the host glass structure and improving the emission intensity.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structure and Luminescent Properties of Niobium-Modified ZnO-B2O3:Eu3+ Glass

Iordanova,

Milanova,

Yordanova

et al. 2024

Materials

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“…The integrated emission intensity ratio (R) of these two transitions 5 D 0 → 7 F 2 / 5 D 0 → 7 F 1 is used to estimate the degree of symmetry around Eu 3+ ions and the strength of covalence of the europium-oxygen bond. The higher R values indicate more site asymmetry of the rare-earth ion, a high covalency between Eu 3+ and O 2− ions, and an enhanced emission intensity [6,54,55]. The intensity ratios, R, of the present glasses (R = 4.7-5.7) (Table 5) are higher than most of the other reported Eu 3+ -doped glasses and have close values to Eu 3+ :Y 2 O 3 and Eu 3+ :Y 2 O 2 S, indicating that the synthesized glasses are characterized by a more distorted environment of the Eu 3+ ion and a high covalent bonding between Eu 3+ and the surrounding ligands, thus achieving an enhanced Eu 3+ emission intensity [15,18,20,36,[56][57][58][59][60][61][62][63][64].…”

Section: Luminescent Propertiesmentioning

confidence: 99%

Network Structure and Luminescent Properties of ZnO–B2O3–Bi2O3–WO3:Eu3+ Glasses

Yordanova,

Milanova,

Iordanova

et al. 2023

Materials

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In this study, we investigated the influence of Bi2O3 and WO3 on both structure and optical properties of 50ZnO:(49 − x)B2O3:1Bi2O3:xWO3; x = 1, 5, 10 glasses doped with 0.5 mol% Eu2O3. IR spectroscopy revealed the presence of trigonal BØ3 units connecting superstructural groups, [BØ2O]− metaborate groups, tetrahedral BØ4− units in superstructural groupings (Ø = bridging oxygen atom), borate triangles with nonbridging oxygen atoms, [WO4]2− tetrahedral, and octahedral WO6 species. Neutron diffraction experimental data were simulated by reverse Monte Carlo modeling. The atomic distances and coordination numbers were established, confirming the short-range order found by IR spectra. The synthesized glasses were characterized by red emission at 612 nm. All findings suggest that Eu3+ doped zinc borate glasses containing both WO3 and Bi2O3 have the potential to serve as a substitute for red phosphor with high color purity.

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“…In the present case, the fact that the dominant emission is from the ED transition rather than from the MD transition indicates, that Eu 3+ ions are situated at sites with noninversion symmetry. Furthermore, the integrated emission intensity ratio (R) of these two transitions ( 5 D 0 → 7 F 2 / 5 D 0 → 7 F 1 ) is used as a spectroscopic key to estimate the degree of asymmetry of the coordination environment around Eu 3+ ions and to determine the strength of covalent bonding between Eu 3+ ion and its surrounding ligand anions [1,25,26]. The higher ratio values correspond to a more distorted (asymmetric) local environment around the active ion site, stronger Eu-O covalence and more intensive luminescence.…”

Section: Photoluminescence Propertiesmentioning

confidence: 99%

Doping effect of WO3 on the structure and luminescent properties of ZnO-B2O3-Bi2O3:Eu3+ glass

Aleksandrov,

Yordanova,

Milanova

et al. 2023

JCTM

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In this study we have investigated the effect of the addition of WO 3 to the Eu 3+ -doped 50ZnO:40B 2 O 3 :10Bi 2 O 3 glass on its structure and physical properties (density, molar volume, glass transition temperature) by using IR spectroscopy, density measurement and DCS analysis. IR revealed that the inclusion of small amount WO 3 modify borate network, favoring formation of high number of BO 3 units with non-bridging oxygens as a results of the destruction of BO 4 containing superstructural units (BO 4 →BO 3 transformation). Tungstate ions incorporate into base zinc-bismuth-borate glass as octahedral [WO 4 O 2 ] 2species with four bridging and two non-bridging oxygen atoms. The PL emission spectra at room temperature of the prepared materials were measured. The observed slight increase of the emission intensity of the rare earth Eu 3+ ion in the spectrum of WO 3 containing glass is an indication of the occurrence of non-radiative energy transfer from glass host to the active ion. The most intense luminescence peak observed at 612 nm suggest that the glasses are potential materials for red emission.

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Compositional dependence of red luminescence from Eu3+ ions doped single and mixed alkali fluoro tungsten tellurite glasses

Cited by 31 publications

References 45 publications

Structure and Luminescent Properties of Niobium-Modified ZnO-B2O3:Eu3+ Glass

Structure and Luminescent Properties of Niobium-Modified ZnO-B2O3:Eu3+ Glass

Network Structure and Luminescent Properties of ZnO–B2O3–Bi2O3–WO3:Eu3+ Glasses

Doping effect of WO<sub>3</sub> on the structure and luminescent properties of ZnO-B<sub>2</sub>O<sub>3</sub>-Bi<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup> glass

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