Absorption and Raman Spectra of Dy3+ Doped Tellurite Glass: Combined Effects of Silver and Titanium Nanoparticles

2017 ◽  
Vol 268 ◽  
pp. 111-116
Author(s):  
Mohd Syamsul Affendy bin Mohd Saidi ◽  
Sib Krishna Ghoshal ◽  
Ramli Arifin ◽  
Mohamad Khairil bin Roslan
Keyword(s):  
Electric Field ◽  
Raman Spectra ◽  
Tellurite Glass ◽  
Rare Earth Ions ◽  
Glass System ◽  
Noble Metal Nanoparticles ◽  
Spectroscopic Techniques ◽  
Combined Effects ◽  
Absorption Bands ◽  
Absorption Properties

Obtaining enhanced up-conversion efficiency in rare earth ions doped inorganic glass by means of noble metal nanoparticles (NPs) embedment remains challenging. For the first time, we report the combined effects of silver (Ag) and titania (TiO2) NPs embedment on the structural and absorption characteristics of dysprosium (Dy3+) doped tellurite glass. Transparent and thermally stable glass samples were prepared using conventional melt quenching method and characterized via spectroscopic techniques. The production of the strong electric field in the proximity of Dy3+ ion due to the localized surface plasmon (LSP) of embedded metallic NPs was found to improve the glass absorption properties. The effects of bimetallic NPs in changing the structure and absorption properties were found to be better than singly included metallic NP (either Ag or TiO2). This improvement in the absorption behavior was attributed to the combined LSP resonance (LSPR) effects of Ag and TiO2 NPs which transferred strong local electric field into the Dy3+ ions positioned in their vicinity. The UV-Vis-NIR spectra revealed six absorption bands centerted at 1690, 1283, 1097, 904, 800 and 755 nm which were allocated to the transition from 6H15/2 ground state to various excited states (6H11/2, 6F11/2, 6F9/2, 6F7/2, 6F5/2 and 6F3/2) of Dy3+ ion. Furthermore, the Raman spectra of such bimetallic NPs included glass system exhibited Raman peak shift accompanied by intensity variations when compared to the glass system with only one type of NPs incorporation. This enhancement in the Raman signal was ascribed to the LSPR mediated mechansim. The synthesized glass comporition was asserted to be prospective for devices.

Samarium Concentration and Optical Correlation of Tellurite Glass

2015 ◽  
Vol 1107 ◽  
pp. 443-448
Author(s):  
Sib Krishna Ghoshal ◽  
Azmirawahida Zainuddin ◽  
Ramli Arifin ◽  
M.R. Sahar ◽  
Md Supar Rohani ◽  
...  
Keyword(s):  
Optical Properties ◽  
Tellurite Glass ◽  
Urbach Energy ◽  
Photonic Devices ◽  
Rare Earth Ions ◽  
Indirect Transition ◽  
Absorption Bands ◽  
Quenching Effect ◽  
Quenching Method ◽  
Inorganic Glasses

Modifying the structural and optical properties of inorganic glasses via controlled doping of various rare earth ions by inhibiting the quenching effect is a challenging task. We report the influence of samarium (Sm3+) ions concentration on enhanced optical properties of tellurite glass. A series of glasses with composition (0.80-x)TeO2 + 0.10Li2O + 0.10 Na2O + xSm2O3, where 0.0<x <0.03 mol% are prepared using melt quenching method and optical characterizations are performed. The XRD spectra confirm the amorphous nature of the glass. The Urbach energy decreases and the optical gap for both direcet and indirect transitions increases with the increse of samerium contents. The UV-Vis spectra comprised of eight absorption bands and PL spectra reveal four prominet peaks corresponding to various transitions from the ground state to the excited states of Sm3+ ion. The optical response shows significant enhancement with increasing concentration of samerium ions. Our detail experimental analyses may be useful for the development of tellurite glass based photonic devices. Keywords: Tellurite Glass, Sm3+ ions, Urbach Energy, Direct and Indirect Transition.

MODIFIED ABSORPTION FEATURES OF TITANIA-ERBIUM INCORPORATED PLASMONIC TELLURITE GLASS SYSTEM

2015 ◽  
Vol 76 (13) ◽  
Author(s):  
Nur Nabihah Yusof ◽  
Sib Krishna Ghoshal ◽  
Ramli Ariffin ◽  
Mohd Rahim Sahar
Keyword(s):  
Electric Field ◽  
Tellurite Glass ◽  
Strong Electric Field ◽  
Emission Cross Section ◽  
Glass Network ◽  
Concentration Quenching ◽  
Glass System ◽  
Suitable Alternative ◽  
Tio2 Nps ◽  
Enhanced Absorption

Achieving efficient lasing glass materials with enhanced absorption and emission cross-section by reducing the Rare Earth (RE) concentration quenching is a challenging issue. Metal nanoparticles (NPs) together with RE ions in the glass matrix are thought as a suitable alternative to overcome the limitations of concentration quenching and weak absorption of inorganic glasses. We prepare a series of Titania-Erbium doped Tellurite glass system with the form (69-x)TeO2-20ZnO-10Na2O-1Er2O3-(x)TiO2, where  0 ≤ x≤ 1.0 mol% via melt-quenching method with optimum erbium contents and varying TiO2 NPs concentrations. The NPs concentration dependent modifications in the absorption characteristics are scrutinized. Glasses are characterized via UV-Vis-NIR and XRD measurements. XRD pattern verifies the amorphous nature of prepared samples. The incorporation of TiO2 NPs is demonstrated to enhance the absorption intensity significantly. This augmentation is attributed to the effect of Surface Plasmon Resonance (SPR) mediated strong local electric field that is swallowed by neighboring Er3+ ions. The observed modification in optical energy band gap and Urbach energy are ascribed to the strong electric field around NPs that interact with the ligand of glass network to transform weak bond into defects. This observation is useful for the development of plasmonic nanoglass materials applicable for photonic devices.

scholarly journals Improved absorbance of holmium activated magnesium-zinc-sulfophosphate glass

2017 ◽  
Vol 13 (3) ◽  
Author(s):  
Siti Aishah Jupri ◽  
Sib Krishna Ghoshal ◽  
Muhammad Firdaus Omar ◽  
Sunita Sharma
Keyword(s):  
Refractive Index ◽  
Optical Absorption ◽  
Glass Network ◽  
Band Gap Energy ◽  
Photonic Devices ◽  
Rare Earth Ions ◽  
Glass System ◽  
Absorption Properties ◽  
Small Component ◽  
Light Amplifier

Constant efforts are dedicated to overcome the limitations of phosphate based glass system, where sulfophosphate glasses (SPGs) played a key role. Rare earth ions (REIs) doped magnesium zinc SPG (MZSPG) systems are technologically prospective due to their several unique attributes. Construction of integrated light amplifier and solid state laser needs the maximum gain within small component dimensions. Thus, Ho3+ ions doped SPGs are believed to meet this demand. Ho3+ ions having sharp optical absorption peaks in the spectral range of 200–900 nm is useful for diversified applications. Conversely, SPGs comprising of oxides of sulphur, phosphorous and at least one other component with SO42- ions contents lower than PO43- with low melting temperature makes them a distinctive class of technologically potential disordered system. In this view, modification of Ho3+ ions absorbance inside SPGs network is challenging. To achieve this goal, following melt-quenching route we prepared a series of Ho3+-doped MZSPG system of composition (60-x)P2O5-(20)ZnSO4-(20)MgO–(x)Ho2O3, where x = 0.0, 0.5, 1.0, 1.5 2.0, and 2.5 mol%. The influence of Ho2O3 concentration on the density, refractive index, and optical absorption properties of the synthesized glass system is examined. The density and refractive index is found to increase with increasing Ho2O3 concentration. The absorption spectra revealed nine prominent peaks centered at 387, 418, 450, 484, 538, 642, 1148 and 1945 nm. The glass absorbance is enhanced with increasing Ho3+ contents. Optical band gap energy is found to range from 3.847 to 3.901 eV. The reduction of Urbach energy from 0.257 to 0.191 eV with increasing Ho3+ contents verified the shrinkage of glass network structure and lowering of defect mediated disorder. In-depth investigations on the structural and optical properties of MZSPG system are underway to achieve the milestones set for photonic devices.

Effects of additives on the thermal stability of silver tellurite glass system

2022 ◽  
Vol 165 ◽  
pp. 108683
Author(s):  
Hyun Woo Kang ◽  
Jung-Hoon Choi ◽  
Ki Rak Lee ◽  
Hwan-Seo Park
Keyword(s):  
Thermal Stability ◽  
Tellurite Glass ◽  
Glass System ◽  
Thermal Stability Of

scholarly journals UV-Accelerated Photocatalytic Degradation of Pesticide over Magnetite and Cobalt Ferrite Decorated Graphene Oxide Composite

Plants ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 6
Author(s):  
Asma Tabasum ◽  
Mousa Alghuthaymi ◽  
Umair Yaqub Qazi ◽  
Imran Shahid ◽  
Qamar Abbas ◽  
...  
Keyword(s):  
Spectroscopic Techniques ◽  
Combined Effects ◽  
X Ray Diffraction ◽  
Contributing Factors ◽  
Reaction Conditions ◽  
X Ray ◽  
Oxidant Concentration ◽  
Optimized Conditions ◽  
High Degradation Rate ◽  
Considerable Loss

Pesticides are one of the main organic pollutants as they are highly toxic and extensively used worldwide. The reclamation of wastewater containing pesticides is of utmost importance. For this purpose, GO-doped metal ferrites (GO-Fe3O4 and GO-CoFe2O4) were prepared and characterized using scanning electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopic techniques. Photocatalytic potentials of catalysts were investigated against acetamiprid’s degradation. A detailed review of the parametric study revealed that efficiency of overall Fenton’s process relies on the combined effects of contributing factors, i.e., pH, initial oxidant concentration, catalyst dose, contact time, and acetamiprid load. ~97 and ~90% degradation of the acetamiprid was achieved by GO-CoFe2O4 and GO-Fe3O4, respectively during the first hour under UV radiations at optimized reaction conditions. At optimized conditions (i.e., pH:3, [H2O2]: 14.5 mM (for Fe3O4, GO-Fe3O4, and GO-CoFe2O4) and 21.75 mM (for CoFe2O4), catalysts: 100 mgL−1, time: 60min) the catalysts exhibited excellent performance, with high degradation rate, magnetic power, easy recovery at the end, and efficient reusability (up to 5 cycles without any considerable loss in catalytic activity). A high magnetic character offers its easy separation from aqueous systems using an external magnet. Moreover, the combined effects of experimental variables were assessed simultaneously and justified using response surface methodology (RSM).

Effects of WO3 on Radiation Shielding Properties of WO3–TeO2 Binary Tellurite Glass System

2021 ◽  
Vol 222 (1) ◽  
pp. 125-135
Author(s):  
S. Ravangvong ◽  
W. Nisspa ◽  
P. Glumglomchit ◽  
P. Amornsophon ◽  
R. Kanuenghet ◽  
...  
Keyword(s):  
Tellurite Glass ◽  
Radiation Shielding ◽  
Glass System ◽  
Shielding Properties

Rare-earth ions doped zinc-tellurite glass for 2 ÷ 3 µm lasers

2018 ◽  
Vol 124 (12) ◽  
Author(s):  
B. I. Denker ◽  
V. V. Dorofeev ◽  
B. I. Galagan ◽  
V. V. Koltashev ◽  
S. E. Motorin ◽  
...  
Keyword(s):  
Rare Earth ◽  
Tellurite Glass ◽  
Rare Earth Ions
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