Structural and Optical Behavior of Vanadate-Tellurate Glasses Containing PbO or Sm2O3 (original) (raw)
Related papers
Spectroscopic Properties of Rare Earth Ion Doped TeO2-B2O3-PbO Glass
Jurnal Teknologi, 2014
This work focuses on the spectroscopic study of RE3+ ion, namely, trivalent neodymium (Nd3+) doped lead borotellurite glass with a composition of TeO2-B2O3-PbO. The glass sample has been prepared by conventional melt-quenching technique. The density, molar volume and optical energy band gap of these glasses have been measured. The refractive index, molar refraction and polarizability of oxide ion have been calculated by using Lorentz-Lorentz relations. The absorption spectra are recorded using UV-Vis-NIR spectrometer in the range of 200-900 nm.
Influence of Rare Earth Ions on the Optical Properties of Tellurite Glass
Acta Physica Polonica A, 2011
The goal of this work was to investigate the influence of rare-earth ions such as Nd 3+ and Er 3+ on the optical properties of tellurite glass of the TeO2-WO3-PbO-La2O3 system. The optical studies of the glasses comprised spectrophotometry (reflectance and transmittance) and spectroscopic ellipsometry. The spectrophotometric measurements yield a number of narrow absorption bands which correspond to characteristic transitions between the ground-and consecutive excited states of rare-earth ions. From ellipsometric studies, in turn, the dispersion of the refraction coefficient has been obtained which appears to be practically the same for the tellurite glass matrix and the matrix doped with Nd 3+ and Er 3+ ions.
Structural, Thermal and Optical Properties of Rare Earth Doped Lead-Tellurite Oxide Glasses
2021
Structural, thermal and optical properties of lead-tellurite oxide glasses consisting TeO2 – PbO – Bi2O3 – Er2O3, synthesized by high temperature melt-quenching-thermal annealing method were investigated in this study. The role of rare-earth element, erbium ion as dopant into the host glass has affected physically, thermally and optically of the glasses. The amorphous nature of the glasses was confirmed by XRD (x-ray diffraction). Thermal exo-endothermic event profiles clarify its glass transformation temperature Tg, crystallization temperature Tx, and melting temperature Tm are exist. Both UV-Vis-NIR optical absorption and Raman spectroscopy have revealed optical energy gap changes due to the structural deformation by the erbium ions. Related obtained glass parameters such as polarizability, refractive indices and metallization criterion were also explained further in this study.
A B S T R A C T BaO-TeO 2 glasses containing 10 to 20-mol% BaO were studied by X-ray diffraction, density, thermal analysis, UV–visible and Raman spectroscopy. The effects of Eu 3 + , Dy 3 + , Er 3 + and Nd 3 + on the density, thermal, optical absorption and luminescent properties of barium tellurite glasses were studied. The short-range structure of barium tellurite glasses consists of TeO 4 trigonal bipyramidal and TeO 3 trigonal pyramidal units. TeeO coordination (N TeeO) was determined by Raman studies; it was found that that N TeeO decreases with increase in BaO and rare earth oxide concentration. The glass transition temperature is a function of both the average single bond enthalpy and non-bridging oxygen concentration in the glass network. Glasses containing Dy 3 + and Eu 3 + show strong visible light photoluminescence, and our results show that barium tellurite glasses are suitable hosts for rare earth ion luminescence due to low phonon energies.
Band gap and polarizability of boro-tellurite glass: Influence of erbium ions
Journal of Molecular Structure, 2014
Understanding the influence of rare earth ions in improving the structural and optical properties of inorganic glasses are the key issues. Er 3+-doped zinc boro-tellurite glasses with composition 30B 2 O 3-10ZnO-(60-x) TeO 2-xEr 2 O 3 are prepared (x= 0, 0.5, 1, 1.5 and 2 mol%) using melt quenching technique. The physical and optical characterizations are measured by density and UV-Vis-IR absorption spectroscopy. The color of the glass changed from light yellow to deep pink due to the introduction of Er 3+ ions. The maximum density is found to be ~4.73 gr.cm-3 for 1 mol% of Er 3+ doping. The variations in the polarizability (6.7-6.8 cm 3) and the molar volume (27.987-28.827 cm 3 mol-1) with dopant concentration are ascribed to the formation of non-bridging oxygen. This observation is consistent with the alteration of number of bonds per unit volume. The direct and indirect optical band gaps are increased while the phonon cutoff wavelength and Urbach energy decreased with the increase of erbium content. A high density and wide transparency range in VIS-IR area are achieved. Our results on high refractive index (~2.416) and polarizability suggest that these glasses are potential for photonics, solid state lasers and communications devices.
Journal of Non-Crystalline Solids, 2017
Er 3+ doped borosilicate glasses were prepared by standard method with the chemical composition (50 − x) B 2 O 3-(10 + x) SiO 2-10 Na 2 O-20 PbO-10 ZnO-0.3 Er 2 O 3 (where x = 0, 5, 10, 15, 20, 25, 30, 35, 40). The prepared glass samples were characterized by XRD, EDAX, FTIR, SEM and TEM. XRD reveals the amorphous nature of the glass samples. Various band positions are confirmed by the FTIR and borate network is present in the wavelength region 650-1700 cm −1. Elemental composition of the glass samples were observed by EDAX. Variation of physical and optical parameters with increasing concentration of SiO 2 affects the glass structure. Decrease in the value of Oxygen Packing Density (OPD) with increasing concentration of SiO 2 shows loosely packed structure of glass samples. Absorption and fluorescence spectra were recorded in Visible and NIR region at room temperature. Judd-Ofelt (JO) intensity parameters were calculated by using oscillator strength and the order of these parameters is Ω 2 N Ω 4 N Ω 6. Radiative properties were obtained by JO parameters and fluorescence spectra. A bright green emission is observed for the transition 2 H 11/2 , 4 S 3/2 → 4 I 15/2 and it is further confirmed by Commission Internationale de l' Eclairage (CIE) chromaticity diagram. 2 H 11/2 , 4 S 3/2 → 4 I 15/2 is suitable for green lasers. This gives the suitability of the present glass sample for fibre optics amplifier and photonic application.
Optical Properties of Rare‐Earth Ions in Lead Germanate Glasses
Journal of the …, 1998
2 ؒ1Ln 2 O 3 , with x = 30 mol% (Ln = Nd, Eu, Er), 40 mol% (Ln = Pr, Nd, Sm, Eu, Dy, Ho, Er, Tm), and 50 mol% (Ln = Eu, Er), have been prepared by quenching the oxidic melts. From the optical absorption and emission spectra in the ultravioletvisible-near-infrared (UV-VIS-NIR) region, the intensity parameters, spontaneous emission probabilities, branching ratios, radiative lifetimes, and, for selected NIR transitions, peak stimulated emission cross sections have been obtained. The trends observed in the intensity parameters have been discussed, as a function of the number of f electrons as well as a function of the lead content. As the amount of lead increases, the covalency of the Ln−O bond increases, the symmetry of the rare-earth site increases, and the dopant site distribution narrows. The peak stimulated emission cross sections rank among the highest found for oxide glasses. J ournal 2045 Fig. 4. NIR emission spectra of lead germanate glasses doped with (a) Nd 3+ , (b) Ho 3+ , and (c) Er 3+ ions for laser excitation at 632.8 nm (the spikes at 1.27 m are second-order peaks of the excitation wavelength).
Structural and luminescence behavior of Er3+ ions doped Barium tellurofluoroborate glasses
Er3+ doped Barium tellurofluoroborate glasses (BTFBxE) with the chemical composition (30 x)TeO2 + 30B2O3 + 20BaO + 20BaF + xEr2O3 (where x = 0.01, 0.05, 0.1, 0.5, 1.0 and 2.0 in wt%) were prepared following the melt quenching technique. The different vibrational modes of borates and tellurites in the prepared glasses were explored through FTIR and Raman spectra. The optical absorption spectra have been used to determine the ionic/covalent nature of the metal–ligand bond in the prepared glasses with the help of Nephelauxetic ratio (b) and bonding parameter (d) studies. The optical band gap of direct and indirect allowed transitions were determined from Tauc’s plot and the variations of band gap energy with structural arrangements were discussed. The Urbach energy values were determined and the relatively lower values of the Urbach’s energy reveal the minimal degree of disorderness in the prepared glasses. The oscillator strengths (fexp and fcal) and Judd–Ofelt (JO) intensity parameters (X2, X4 and X6) were calculated with the application of JO theory and the trends of the JO intensity parameters are found to be X2 > X6 > X4 for all the prepared glasses with a minimum variation in X2 intensity parameter values. A bright green emission was observed from the 2H11/2 + 4S3/2?4I15/2 transition and the radiative properties such as transition probability (A), stimulated emission cross-section (rEP ), branching ratio (br) and radiative lifetime (s) were calculated using the JO parameters. The suitability of the prepared glasses for the fabrication of photonic devices were also discussed and reported in the present work.