Spectroscopic Properties of TeO2-Bi2O3-ZnO-PbO Based Tellurite Glasses

2017 ◽  
Vol 904 ◽  
pp. 98-101 ◽  
Author(s):  
Ahmad Marzuki ◽  
Wahyudi ◽  
Adi Pramuda
Keyword(s):  
Spectroscopic Properties ◽  
Infrared Region ◽  
Tellurite Glasses ◽  
Melt Quenching ◽  
Minimum Loss ◽  
Scattering Loss ◽  
Long Wavelength ◽  
Short Wavelength Side ◽  
Quenching Method ◽  
Wavelength Side

Tellurite glasses with molar compositions of 55TeO2–2Bi2O3–[43-x] ZnO–xPbO (in mol%) with x= 1, 2, 3, 4, 5 was fabricated by melt quenching method. Their absorption spectra ranging from ultraviolet to infrared region were measured using UV-VIS-NIR spectrophotometer and FTIR. Minimum losses of all glasses were then estimated from the intersection of the ‘V’ curve formed from the intersection of the extrapolation of the IR edge on the long wavelength side of the spectrum and the scattering loss curve on the short wavelength side of the spectrum. From this work, it was that the estimated minimum loss of the investigated glasses were within the range between 2.31·10-3dB/m and 2.94·10-3 dB/m at wavelength around 5.5 μm.

scholarly journals Röntgenspektroskopische Untersuchung der chemischen Bindung in Oxiden

1967 ◽  
Vol 22 (9) ◽  
pp. 1401-1407 ◽  
Author(s):  
Hans-Ulrich Chun ◽  
Dieter Hendel
Keyword(s):  
Fine Structure ◽  
Metal Atom ◽  
Short Wavelength ◽  
The Other ◽  
Main Line ◽  
Ionic Character ◽  
Long Wavelength ◽  
Short Wavelength Side ◽  
Oxygen Bond ◽  
Wavelength Side

This paper reports about the fine structure in the O—K-spectra of the oxides BeO, MgO, CaO, SrO, BaO, Sc2O5, Y2O3, La2O3, Sm2O3, Yb2O3, NiO and ZnO. The spectra show the satellite lines α3, α4, α5, α6 on the short wavelength side of the main line α1,2 and a shoulder β′ on its long wavelength side. The wavelengths of all lines depend on the nature of the oxide. For the positions of the lines Kα1.2 in the spectra no systematic relation to other data of the oxides is observed. On the other hand the distance of the a4-satellite from the α1,2-line decreases with increasing electronegativity of the metal atom in the oxide. This distance can be used as a measure for the ionic character of the metal-oxygen bond in these compounds.

scholarly journals Europium-doped boro-bismuth-tellurite glasses for multicolor phosphor applications

2016 ◽  
Vol 94 (2) ◽  
pp. 188-191 ◽  
Author(s):  
K. Keshavamurthy ◽  
B. Eraiah
Keyword(s):  
Band Gap ◽  
Molar Volume ◽  
Urbach Energy ◽  
Glass System ◽  
Band Gaps ◽  
Tellurite Glasses ◽  
Melt Quenching ◽  
Yellow Orange ◽  
Quenching Method ◽  
Indirect Band Gap

The glass system (50–x)B2O3–30Bi2O3–20TeO2–xEu2O3 (x = 0, 0.1, 0.5, 1.0, 1.5, and 2.0 mol%) having been prepared using the conventional melt quenching method, is investigated in terms of physical, optical, and luminescence properties. The density of these glasses is measured and the corresponding molar volume is also calculated. The (αhν)1/n versus hν graph was plotted and it is well fitted to both direct (n = 1/2) and indirect (n = 2) band gaps. The direct and indirect band gap values range from 2.57 to 2.94 eV and 1.74 to 2.58 eV, respectively. The Urbach energy of the glass system was calculated to have values ranging from 0.29 to 0.62 eV. Yellow, orange, and red emissions have been observed through photoluminescence (PL) spectroscopy excited at 464 nm and the obtained multicolor emissions have been demonstrated according to the Commission International de l’Eclairage de France 1931 standards. The results of PL studies indicated the possibility towards the development of multicolor phosphor applications.

Spectroscopic Properties of Ho3+ Doped in B2O3-SiO2-SrO-Bi2O3-TiO2 Glasses

2016 ◽  
Vol 675-676 ◽  
pp. 393-396
Author(s):  
Nattapon Srisittipokakun ◽  
Pruek Prongsamrong ◽  
Jakrapong Kaewkhao
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Spectroscopic Properties ◽  
Nominal Composition ◽  
Melt Quenching ◽  
Doped Glasses ◽  
Refractive Index Increase ◽  
Quenching Method

A series of glasses with nominal composition in (53-x)B2O3:11SiO2:34SrO:1Bi2O3:1TiO2: xHo2O3 (BSSBT) where x = 0.0, 0.5, 1.0, 1.5, 2.0 and 2.5 mol% was synthesized by conventional melt quenching method. The as-prepared glasses have been investigated and reported for their physical and optical properties. The results show that, the densities and refractive index increase with increasing Ho2O3 content in the glasses. The absorption peaks of doped glasses were observed at a wavelength of around 420, 460, 480, 540, 640 and 900 nm which are assigned to 5I8 ® 5G5, 5G6, 5F3, (5F4+5S2), 5F5 and 5I5 transitions of Ho3+, respectively.

Optical Absorption of Er3+/Nd3+ Co-Doped Tellurite Glass

2012 ◽  
Vol 501 ◽  
pp. 96-100 ◽  
Author(s):  
S. Akmar Roslan ◽  
M. Rahim Sahar ◽  
Ramli Arifin ◽  
Sib Krishna Ghoshal ◽  
M. Supar Rohani ◽  
...  
Keyword(s):  
Tellurite Glass ◽  
Optical Band Gap ◽  
Urbach Energy ◽  
Tellurite Glasses ◽  
X Ray Diffraction ◽  
Melt Quenching ◽  
X Ray ◽  
Diffraction Patterns ◽  
Quenching Method ◽  
Co Doped

Tellurite glasses of varying Er3+/Nd3+ concentration were successfully prepared by melt-quenching method. The X-Ray diffraction pattern was determined by using Siemens Diffractometer D5000 while the optical properties were measured using Shimadzu 3101 pc UV-VIS NIR scanning spectrophotometer. It was found that the diffraction patterns of all samples showed glasses characteristics. The optical band gap, Eopt¬ increased proportionally with the content of Er¬2O3 but Urbach energy, ∆E decreased due to the increasing Er2O3 contents.

scholarly journals Optical Properties of Erbium doped Molybdenum Tellurite Glasses

2016 ◽  
Vol 15 (1) ◽  
pp. 17-27
Author(s):  
B Eraiah
Keyword(s):  
Optical Properties ◽  
Room Temperature ◽  
Urbach Energy ◽  
Amorphous Semiconductors ◽  
Tellurite Glasses ◽  
Melt Quenching ◽  
Erbium Doped ◽  
Uv Visible ◽  
Quenching Method ◽  
Indirect Band Gap

The glasses with the composition of xEr 2 O 3 -5AgCl- 15MoO 3 -(80-x) TeO 2 (x = 0, 0.5 and 1 mol%, named as SMT0, SMT1 and SMT2, respectively) were synthesized using conventional melt quenching method and their optical properties were investigated through UV-Visible spectrophotometer. Density and molar volume values of the glass samples were estimated, their values were found in the range from 5.52 to 5.64 g/cm 3 and 27.737 to 28.689 cm 3 , respectively. The UV absorption spectra were recorded at room temperature in the wavelength range 200-1100nm. From the absorption edge data, it is found that both the direct and indirect type transitions may takeplace. The direct and indirect band gap values are ranging from 1.92 to 2.29 eV and 1.24 to 1.77 eV, respectively. Also, the Urbach energy (E tail ) values were determined and their values are ranging from 0.33 to 0.54 eV. These obtained E tail values are well matched with amorphous semiconductors (0.046 to 0.66 eV).

scholarly journals Optical Properties of Erbium Zinc Tellurite Glass System

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Sidek Hj. Abdul Aziz ◽  
R. El-Mallawany ◽  
Siti Shawaliza Badaron ◽  
Halimah Mohamed Kamari ◽  
Khamirul Amin Matori
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Molar Volume ◽  
Absorption Spectra ◽  
Wavelength Range ◽  
Room Temperature ◽  
Tellurite Glass ◽  
Tellurite Glasses ◽  
Melt Quenching ◽  
Quenching Method

Er3+-doped tellurite glasses with molar compositions ofxEr2O3-20ZnO-(80-x)TeO2(x=0, 1, 2, 3, and 4 mole%) (EZT) have been successfully synthesized by the melt-quenching method. Density and molar volume have been measured. UV-VIS absorption spectra in the wavelength range of 400–800 nm at room temperature has been measured. The band gap for every composition has been calculated. Photoluminescence spectroscopy in the wavelength range of 400–650 nm and at room temperature has been evaluated.

scholarly journals Interpretation of Pseudocontinua in the Spectra of Highly Ionized Atoms from Tm To W in Laser Produced Plasmas

1984 ◽  
Vol 86 ◽  
pp. 215-218
Author(s):  
P. Mandelbaum ◽  
M. Klapisch ◽  
A. Krasnitz ◽  
A. Zigler
Keyword(s):  
Spectral Range ◽  
Simple Structure ◽  
Complex Pattern ◽  
X Ray ◽  
Long Wavelength ◽  
Line Identification ◽  
Laser Produced Plasma ◽  
Resonant Transitions ◽  
Wavelength Side

X-ray spectra of highly ionized atoms (Tm to Pt) emitted from Laser produced plasma are characterized by the simple structure given by resonant transitions of the Nil-like ions, accompanied by the more complex pattern of satellite transitions emitted by ions in the neighbouring states of ionization. An analysis of these structures has been given recently for the satellites of the 3d10 − 3d94p[l] and of the 3p63dl0 − 3p53d104s, 4d[2] transitions of the Nil-like inns. However, most of the radiation emitted in this spectral range [4–10Å] concentrate in a wide, rather structureless satellite feature in the long wavelength side of the 3d10 −3d94f Ni-I like transition, on which some lines are superimposed. Line identification has been achieved successfully with the methods of [1], [2] and will be published separately. In this communication, we deal only with the pseudocontinuum.

scholarly journals Morphology and Magnetic Properties of Ferriferous Two-Phase Sodium Borosilicate Glasses

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Alexander Naberezhnov ◽  
Nadezda Porechnaya ◽  
Viktor Nizhankovskii ◽  
Alexey Filimonov ◽  
Bernard Nacke
Keyword(s):  
Magnetic Properties ◽  
Iron Oxides ◽  
Channel Structure ◽  
Borosilicate Glasses ◽  
Melt Quenching ◽  
Two Phase ◽  
Furnace Charge ◽  
Self Assembling ◽  
Quenching Method ◽  
Drop Structure

This contribution is devoted to the study of morphology and magnetic properties of sodium borosilicate glasses with different concentrations (15, 20, and 25 wt.%) ofα-Fe2O3in an initial furnace charge. These glasses were prepared by a melt-quenching method. For all glasses a coexistence of drop-like and two-phase interpenetrative structures is observed. The most part of a drop structure is formed by self-assembling iron oxides particles. All types of glasses demonstrate the magnetic properties and can be used for preparation of porous magnetic matrices with nanometer through dendrite channel structure.

Thermally activated current–voltage asymmetry in quantum-well inter-subband photodetectors

1996 ◽  
Vol 74 (S1) ◽  
pp. 9-15 ◽  
Author(s):  
P. V. Kolev ◽  
M. J. Deen ◽  
H. C. Liu ◽  
Jianmeng Li ◽  
M. Buchanan ◽  
...  
Keyword(s):  
Quantum Well ◽  
Carrier Transport ◽  
Transport Phenomena ◽  
Infrared Region ◽  
Avalanche Photodetectors ◽  
Long Wavelength ◽  
Hot Carrier ◽  
Thermally Activated ◽  
Current Voltage ◽  
Long Wavelength Infrared

Continuing research interest in quantum-well inter-subband-based devices can be associated with its prospects for numerous optoelectronic applications in the long wavelength infrared region. This paper presents experimentally measured field dependence of the thermally activated effective-barrier lowering in quantum-well inter-subband photodetectors (QWIPs). This barrier lowering is considered to be the main cause of the commonly observed asymmetry in the current–voltage characteristics of QWIPs. The research results presented here are important for understanding the factors determining the dark-current mechanisms that are crucial for further improvement in the characteristics of these devices. The study of current-carrier transport phenomena in a quantum well is also of interest for developing quantum-well lasers and avalanche photodetectors based on intraband processes, and also transistors based on ballistic or hot carrier transport phenomena.

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