Ions Doped Borate Glasses Research Articles

Effect of Dy3+ ions on physical, structural and thermal properties of ZnNaPbB glasses

In this report, inspired by the excellent spectroscopic characteristics of dysprosium (Dy3+) ions doped borate glasses, a series with the composition (70-x)B2O3-10ZnO-10PbO-10Na2CO3-xDy2O3 (here ‘x’ have the values as 0.1, 0.5, 1.0, 1.5 and 2.0 in mol % ) was made using the melt quenching process and named as ZnNaPbBDy0.1 to ZnNaPbBDy2.0. Here we study the physical, structural and thermal properties of Dy3+ ions doped Zinc Sodium Lead Borate (ZnNaPbB) glasses through different characterization techniques like Fourier transform infrared (FT-IR), Raman spectroscopy, Differential scanning calorimetry (DSC) and decay spectroscopy. Several physical parameters were evaluated to assess the effect of Dy3+ inclusion. FT-IR and Raman spectra confirm the presence of BO3 and BO4 structural units. The data recorded by DSC spectra have been used to predict the glass transition temperature (Tg). The nature of decay spectra was estimated which diverges from exponential to non-exponential at higher concentrations. The decay spectral data is used to calculate the experimental lifetimes for all the glass samples. The Inoakutti Hirayama (I-H) model and Dexter’s plot are used to confirm the type of interaction between the donor and acceptor Dy3+- Dy3+ ions is dipole–dipole in nature that is responsible for the emission intensity quenching with concentration. All the above results might be advantageous for variety of applications in photonic devices.

Influence of alkali and alkaline-earth metal oxides on Sm3+ ions-doped borate glasses: synthesis, structural, and optical investigations for reddish-orange solid-state-lighting applications

Influence of alkali and alkaline-earth metal oxides on Sm3+ ions-doped borate glasses: synthesis, structural, and optical investigations for reddish-orange solid-state-lighting applications

Synthesis, optical and magnetic properties of Nd2O3/borate strontium fluoride glasses

The present work conducts the synthesis, thermal, optical, and magnetic characterization of (60-x)B2O3+20Li2O+20SrF2+ x Nd2O3 where x = 0, 0.5, 1, 1.5, 2 mol% glass samples. The samples were investigated via X-ray diffraction (XRD), Raman spectroscopy, differential scanning calorimetry (DSC), UV–Vis absorption spectroscopy, and vibrating sample magnetometry (VSM). XRD patterns for borate strontium fluoride glass samples doped with Nd2O3 showed broad humps around 30 and 43°, indicating their amorphous structure. Raman spectra of glass samples indicated that as Nd3+ ions were added to the host matrix, there was an increase in Raman intensity due to bond breakdown and the development of more non-bridging oxygen (NBO) species. The DSC data of the borate strontium fluoride glass samples doped with Nd2O3 demonstrated that the glass transition temperature (Tg) generally increased. UV–Vis absorption spectra showed transitions in Nd3+ ions doped borate glasses that are associated with the bands at different wavelengths, attributed to 4G5/2+2G7/2, 2H11/2, 4F9/2, 2H9/2 +4F5/2, and 4F3/2. The refractive index of borate strontium fluoride glass samples doped with Nd2O3 increased. The saturation magnetization values decreased from 0.9 to 0.29 upon increasing the Nd2O3 percentage (0–2 mol%). These low saturation magnetization glass samples can be used in spintronic devices to effectively reduce switching current density and lower the damping constant.

Optimization of dysprosium ions doped borate glasses for photoluminescence applications

In this report, we present a comprehensive explanation of the luminescent features of Dy3+-ions doped Zinc Sodium Lead Borate (ZnNaPbB) glasses through various characterizations like UV–Vis-NIR, absorption and emission spectroscopy. The absorption spectra were used to determine the optical bandgap (Eopt) and Urbach energy (ΔE). The emission spectra are dominated by three peaks (strong yellow, blue and weak red) in the visible range at 481 nm, 575 nm and 664 nm. The CIE coordinates lie in the pure white region of the chromaticity diagram indicating that the as-prepared glasses have possible applications for optoelectronic devices.

Investigation of Dy3+ Ion Doped Borate Glasses and Their Potential for WLED and Laser Application

In this research, Dy 3+ ion-doped Na 2 O-PbO-ZnO-Li 2 O-B 2 O 3 glasses were developed using the melt and quenching method. The addition of Dy 3+ ions in the glass improved the optical properties. The XRD graph verified the amorphous of the glass sample. FTIR showed the vibration of BO 3 and BO 4 in the structure of the glass. The enhancement of NBOs in the structure of the glass affected the reduction of the bandgap energy of the glass. The hypersensitive transition of the present glass was found at 1270 nm (infrared region) due to electron movement from the 6 H 15/2 level to the 6 H 9/2 + 6 F 11/2 level. The strong white emission of the glasses came from 575 nm (yellow region) and 483 nm (blue region) when excited by 349 nm. The CIE 1931 chromaticity was located at (0.37;0.40) and verified the white emission of the glasses. Meanwhile, the trendline of the JO parameter was W 2 > W 6 > W 4 ,indicating the high ionic character of the glass structure. The value of the calculated branching ratio and emission cross-section of Dy_1.0 glass was 0.64 and 0.90 x 10 -20 cm 2 , respectively. From the analysis of results, the present glass has high potential for WLED and laser application.

Photoluminescence investigations on Sm3+ ions doped borate glasses for tricolor w-LEDs and lasers

This work describes mainly the optical absorption, photoluminescence (PL) and decay spectral properties of Sm3+ ions doped borate glasses to understand their possible usage in tricolor w-LEDs and lasers.The XRD spectrum recorded for an un-doped glass confirms glassy nature of the as prepared glass. The Judd-Ofelt (J-O) intensity parameters evaluated from experimental oscillator strengths were used in estimating the various radiative parameters. Under 402 nm excitation, the PL spectra exhibit intense emission at 600 nm for which the decay spectral profiles were recorded.The decay profiles are converting from single exponential to non-exponential with increase in Sm3+ ion concentration ensuing decrease in experimental lifetimes which may be attributed to the efficient energy transfer through cross-relaxation process. The non-exponential decay curves fitted to I-H model reveals the interaction between the Sm3+ ions as dipole-dipole in nature. From the evaluated emission cross-sections, quantum efficiency, branching ratios and CIE co-ordinates, it is concluded that 1 mol% Sm3+ ions in these glasses are aptly suitable to fabricate reddish-orange luminescent devices.

Anomalous DC electrical conductivity in mixed transition metal ions doped borate glasses

A novel series of borate glasses in the composition, xCo3O4+(50−x) (V2O5)+50 B2O3 where x=0.05 to 0.45 have been prepared by melt quenching technique. X-ray diffraction studies confirmed the non-crystalline nature of the samples. The room temperature density and molar volume varied non-linearly with cobalt concentration. Electrical conductivity and activation energy were determined and both varied non-linearly with cobalt concentration. Conductivity reached minimum and activation energy reached maximum at x=0.4 of cobalt concentration. This anomalous behavior is due to the enhancement of Anderson localization caused by increase in configurational disorder. Various polaron related parameters were investigated in the light of Mott's SPH model for T>θD2. The density of states at fermi level was determined using Greaves VRH model which adequately explains conductivity for T<θD2. The nonlinear variation in various physical parameters with second TMI is attributed to the mixed transition effect.