Photoluminescence of Er3+: PbO - B2O3 - TeO2 Glass under 650nm Excitation Wavelength

2012 ◽  
Vol 622-623 ◽  
pp. 187-190 ◽  
Author(s):  
E.S. Nurbaisyatul ◽  
K. Azman ◽  
H. Azhan ◽  
A. Noranizah
Keyword(s):  
Optical Properties ◽  
Absorption Spectra ◽  
Glass Sample ◽  
Chemical Properties ◽  
Optical Measurements ◽  
Excitation Wavelength ◽  
Potential Candidate ◽  
Erbium Doped ◽  
Optical Applications ◽  
Physical And Chemical

Erbium doped borotellurite glass has been identified as one of the most potential candidate for optical applications due to their excellent in physical and chemical properties. Therefore, the aim of this study is to identify the optical properties by mean of their UV-Vis and photoluminescence spectroscopic of the Er3+doped borotellurite glass. In this work, erbium doped borotellurite glass, (80-x)TeO2-10 B2O3-10PbO-xEr2O3, where 0.5 mol % x 2.0 mol % has been successfully fabricated by using melt-quenched techniques. The glass obtained is in good quality since it shows no sign of devitrification. The glass sample has undergone some physical and optical measurements. From the XRD results, it confirms that the glass is in amorphous nature. Meanwhile, it is found that the density of the glass sample increases from 4.4187 gcm-3to 4.5769 gcm-3with respect to Er content. For the optical properties, the absorption spectra were measured by UV-Vis-NIR spectrophotometer in the range 400-900 nm interval. From the absorption spectra, the 650 nm excitation wavelength is found to be the most predominant peaks. From the photoluminescence spectra, five significant emission peaks have been observed where by four of them is in the visible regions which is corresponds to 440 nm, 486 nm, 520 nm and 650 nm wavelength while the other one is in NIR regions at 794 nm. Some other results were also been analyzed and presented.

The role of dysprosium ions on the physical and optical properties of lithium-borosulfophosphate glasses

2017 ◽  
Vol 31 (13) ◽  
pp. 1750101 ◽  
Author(s):  
Ibrahim Bulus ◽  
S. A. Dalhatu ◽  
R. Hussin ◽  
W. N. Wan Shamsuri ◽  
Y. A. Yamusa
Keyword(s):  
Optical Properties ◽  
Optical Absorption ◽  
Absorption Spectra ◽  
Physical Parameters ◽  
Potential Candidate ◽  
Optical Absorption Spectra ◽  
Absorption Bands ◽  
X Ray ◽  
Nir Absorption ◽  
Optical Applications

Achieving outstanding physical and optical properties of borosulfophosphate glasses via controlled doping of rare earth ions is the key issue in the fabrication of new and highly-efficient glass material for diverse optical applications. Thus, the effect of replacing P2O5 by Dy2O3 on the physical and optical properties of Dy[Formula: see text]-doped lithium-borosulfophosphate glasses with chemical composition of 15Li2O–30B2O3–15SO3–[Formula: see text]P2O5–[Formula: see text]Dy2O3 (where 0.0 mol.% [Formula: see text] mol.%) has been investigated. The glass samples were synthesized from high-purity raw materials via convectional melt-quenching technique and characterized by X-ray diffraction (XRD), energy-dispersive X-ray spectrometry (EDX), density and UV–vis–NIR absorption measurements. The amorphous nature of the prepared glass samples was confirmed by XRD patterns whereas the EDX spectrum depicts elemental traces of O, C, B, S, P and Dy. The physical parameters such as density, refractive index, molar volume, polaron radius and field strength were found to vary nonlinearly with increasing Dy2O3 concentration. UV–vis–NIR absorption spectra revealed seven absorption bands with most dominant peak at 1269 nm (6H[Formula: see text]F[Formula: see text]H[Formula: see text]). From the optical absorption spectra, the optical bandgap and Urbach’s energy have been determined and are related with the structural changes occurring in these glasses with increase in Dy2O3 content. Meanwhile, the bonding parameters ([Formula: see text]) evaluated from the optical absorption spectra were found to be ionic in nature. The superior features exhibited by the current glasses nominate them as potential candidate for nonlinear optical applications.

Strong Down-Conversion Emission of Sm3+ Doped Borotellurite Glass under 480 nm Excitation Wavelength

2016 ◽  
Vol 705 ◽  
pp. 204-208
Author(s):  
Siti Nasuha Rafien ◽  
Azman Kasim ◽  
Azhan Hashim ◽  
S. Akmal Syamsyir ◽  
Mardhiah Abdullah ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Emission Spectra ◽  
Ultra Violet ◽  
Luminescence Spectra ◽  
Excitation Wavelength ◽  
Physical Parameters ◽  
Tellurite Glasses ◽  
Physical And Chemical ◽  
Down Conversion ◽  
And Chemical Properties

Tellurite glasses were generally applied in rare earth optical materials due to their excellent in physical and chemical properties. In this study, tellurite glasses composed of (70-x)TeO2-20B2O3-10ZnO-xSm2O3 (x = 0.0, 0.5, 1.0, 1.5, 2.0 and 2.5 mol %) were prepared by conventional melt-quenching technique. Some basic physical parameters such as density, molar volume and oxygen packing density as well as the optical analysis by mean of their absorption and emission spectra have been carried out at room temperature using UV/Vis and photoluminescence spectrophotometer. The result of physical properties are found to vary with respect to concentration of Sm3+ ions content. Meanwhile, three strong absorption peaks are observed and are well resolved in the ultra violet and visible regions due to transitions between the ground state and various excited state of Sm3+ ions. Under 480nm laser excitation, luminescence spectra exhibit four emission bands at 562 nm, 599 nm, 645 nm and 706 nm which corresponding to the transition 4G5/2 → 6H5/2, 4G5/2 → 6H7/2, 4G5/2 → 6H9/2 and 4G5/2 → 6H11/2 were observed. Some other results were also been analysed and presented.

scholarly journals Quantification of black carbon mixing state from traffic: implications for aerosol optical properties

2016 ◽  
Vol 16 (7) ◽  
pp. 4693-4706 ◽  
Author(s):  
Megan D. Willis ◽  
Robert M. Healy ◽  
Nicole Riemer ◽  
Matthew West ◽  
Jon M. Wang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Black Carbon ◽  
Chemical Properties ◽  
Mixing State ◽  
Aerosol Optical Properties ◽  
Aerosol Composition ◽  
Average Mass ◽  
Measurement Capability ◽  
Aerosol Mass ◽  
Physical And Chemical

Abstract. The climatic impacts of black carbon (BC) aerosol, an important absorber of solar radiation in the atmosphere, remain poorly constrained and are intimately related to its particle-scale physical and chemical properties. Using particle-resolved modelling informed by quantitative measurements from a soot-particle aerosol mass spectrometer, we confirm that the mixing state (the distribution of co-emitted aerosol amongst fresh BC-containing particles) at the time of emission significantly affects BC-aerosol optical properties even after a day of atmospheric processing. Both single particle and ensemble aerosol mass spectrometry observations indicate that BC near the point of emission co-exists with hydrocarbon-like organic aerosol (HOA) in two distinct particle types: HOA-rich and BC-rich particles. The average mass fraction of black carbon in HOA-rich and BC-rich particle classes was  < 0.1 and 0.8, respectively. Notably, approximately 90 % of BC mass resides in BC-rich particles. This new measurement capability provides quantitative insight into the physical and chemical nature of BC-containing particles and is used to drive a particle-resolved aerosol box model. Significant differences in calculated single scattering albedo (an increase of 0.1) arise from accurate treatment of initial particle mixing state as compared to the assumption of uniform aerosol composition at the point of BC injection into the atmosphere.

Some Transition Ions in Heavy Metal Fluoride Glasses

1986 ◽  
Vol 88 ◽  
Author(s):  
L. D. Bogomolova ◽  
F. Caccavale ◽  
N. A. Krasil'nikova
Keyword(s):  
Heavy Metal ◽  
Chemical Properties ◽  
Metal Fluoride ◽  
Structural Peculiarity ◽  
Fluoride Glasses ◽  
Wide Range ◽  
Heavy Metal Fluoride ◽  
Optical Applications ◽  
Heavy Metal Fluoride Glasses ◽  
Physical And Chemical

ABSTRACTThe heavy metal fluoride glasses (HMFG) have attracted considerable attention in recent years because of their unusual physical and chemical properties which allow potential use in numerous electrical and optical applications. The HMFG are transparent over a wide range of the optical spectrum (from 220 nm to 8,μ) and have sufficient chemical stability to make them a suitable optical material middle IR fibers optics. Their high anionic conductivity permits their application as solid electrolytes. They are also of interest scientifically since their structure is different from that of other inorganic glasses. The high coordination number of the network formers ions is the principal structural peculiarity of the HMFG.

scholarly journals The absorption spectra of the vapours of benzene and its homologues at different temperatures and pressures, and likewise of solutions of benzene

1908 ◽  
Vol 80 (537) ◽  
pp. 162-165 ◽  
Keyword(s):  
Absorption Spectra ◽  
Chemical Structure ◽  
Constant Pressure ◽  
Chemical Properties ◽  
Complete Agreement ◽  
Physical And Chemical Properties ◽  
Different Temperatures ◽  
Temperature And Pressure ◽  
Physical And Chemical ◽  
And Chemical Properties

The author having been engaged since the year 1877 in investigating and correlating the physical and chemical properties of aromatic substances in relation to their chemical structure or constitution, he has latterly found it desirable that several very definite compounds should be examined in a state of vapour, as well as in solution. The work of E. Pauer, W. Friederichs, and of L. Grebe is referred to in detail. The vapours of benzene and several of its derivatives have been examined (1) at different temperatures and constant pressure; and (2) at different pressures, the temperature being constant. The previous measurements of Pauer, Friederichs, and Grebe have been confirmed, and reconciled where they do not show complete agreement with each other. The records of temperature and pressure, and the shortening of the exposure of the photographic plates, constitute important differences between the work of the former investigators and that of the author.

Physical and optical properties of magnesium sulfoborate glasses doped Dy3+ ions

2016 ◽  
Vol 30 (10) ◽  
pp. 1650054 ◽  
Author(s):  
S. A. Dalhatu ◽  
Karim Deraman ◽  
R. Hussin
Keyword(s):  
Optical Properties ◽  
Excitation Wavelength ◽  
Absorption Bands ◽  
Dysprosium Oxide ◽  
Weak Band ◽  
Hypersensitive Transition ◽  
Prepared Glass ◽  
Intense Luminescence ◽  
Optical Applications ◽  
Yellow Region

The optical properties of alkaline earth borate glasses doped with rare earth are attractive field of research due to many optical applications. We have concentrated on the physical and optical properties of MgO–SO4–B2O3 glass with different concentrations of Dy[Formula: see text] ions. The samples of glass were prepared using the melting quenching technique. The physical parameter and optical properties of the prepared glass were determined. It was observed that the density of the glass samples increased and the molar volume reduced with respect to Dy[Formula: see text] ions content. Dy[Formula: see text]: MgO–SO4–B2O3 glass displayed 10 absorption bands with hypersensitive transition around 1265 nm (6H[Formula: see text]F[Formula: see text]). Two intense luminescence emissions were observed at 482 nm (4F[Formula: see text]H[Formula: see text]: blue) and 573 nm (4F[Formula: see text]H[Formula: see text]: yellow) and weak band at 662 nm (4F[Formula: see text]H[Formula: see text]: red) with excitation wavelength 380 nm. A strong enhancement in the emission peaks at 573 nm in the yellow region was observed with the 0.07 mol% concentration of dysprosium oxide, which may assign to the energy transfer from Mg[Formula: see text] to Mg[Formula: see text] ions. Beyond the optimum concentration, contrary result was observed.

scholarly journals Positional Effect of π-extension in Triple Helicenes

2021 ◽  
Author(s):  
Alex van der Ham ◽  
Thomas Hansen ◽  
Hermen S. Overkleeft ◽  
Trevor A. Hamlin ◽  
Dmitri V. Filippov ◽  
...  
Keyword(s):  
Optical Properties ◽  
Rational Design ◽  
Marked Effect ◽  
Chemical Properties ◽  
Spectroscopic Properties ◽  
Positional Effect ◽  
Physico Chemical ◽  
Optical Applications ◽  
High Level ◽  
Vt Nmr

The targeted application of multiple helicenes in photo-optical applications requires their rational design. Toward this goal, we report on the synthesis of pyrene-based triple helicene 1 and investigate the positional effect of extension of the π-conjugated system on the photo-chemical and chiro-optical properties of triple helicenes. The conformational and aggregatory behavior of 1 were studied both experimentally using VT NMR spectroscopy and computationally using high-level DFT computations. Although π-extension was observed to have a marked effect on the spectroscopic properties of triple helicenes, comparison with other known π-extended helicenes reveals that the position at which π-extension is introduced is only of nominal importance. Our results thus suggest that the presence of a particular helicene motif is dominant in dictating the physico-chemical properties of triple helicenes.

Magnetic and Magneto-Optical Properties of Sputtered Co-CeO2 Thin Films on Al2O3 (0001) Substrates with (100) Orientation

2011 ◽  
Vol 687 ◽  
pp. 117-121 ◽  
Author(s):  
Yuan Qiang Song ◽  
Huai Wu Zhang ◽  
Ying Li Liu ◽  
Yuan Xun Li ◽  
Qi Ye Wen
Keyword(s):  
Optical Properties ◽  
Magnetron Sputtering ◽  
Faraday Rotation ◽  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Optical Measurements ◽  
Magnetic Oxide ◽  
Out Of Plane ◽  
Potential Applications ◽  
Optical Applications

Diluted magnetically doped CeO2 films is an attractive dilute magnetic oxide which would facilitate the practical realization of spintronic devices and may also be used to explore novel magneto-optical applications. In this experiments, 3 at% cobalt-doped CeO2 films with the stoichiometry of Ce0.97Co0.03O2-δ (CCO) were deposited by magnetron sputtering methods on Al2O3 (0001) substrates. The structural, magnetic, and magneto-optical properties were investigated. The results indicate that CCO films with CeO2 (100) orientation can readily be obtained via magnetron sputtering on Al2O3 (0001) substrates. Films are ferromagnetic at room temperature, which is anisotropic with an out-of-plane magnetization easy axis. Magneto-optical measurements exhibit a giant Faraday rotation of about 4800 deg/cm at 650 nm wavelength in out-of-plane direction. The excellent room-temperature ferromagnetism and the giant Faraday rotation in CCO films show highly potential applications in novel magneto-optical devices as well as in spintronics.

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