Spectroscopic Studies of the Energy Levels of the Nd3+ Ion in Single Crystals of SrO.6Al2O3

1988 ◽  
Vol 41 (4) ◽  
pp. 549 ◽  
Author(s):  
H Tajalli
Keyword(s):  
Raman Spectroscopy ◽  
Fluorescence Spectra ◽  
Energy Levels ◽  
Selective Excitation ◽  
Spectroscopic Studies ◽  
Solid State Laser ◽  
Host Lattice ◽  
Absorption And Fluorescence Spectra ◽  
Excitation Spectra ◽  
Laser Material

A detailed study of the polarised absorption and fluorescence spectra and the selective excitation spectra of the Nd3+ ion in the SrO.6Al20 3 host lattice was carried out over the temperature range 4�2 to 500 K. The empirical energy level schemes were determined for two dominant sites of Nd3+ in SrO.6Al20 3 up to 20000 cm -1. The intensity, linewidth and thermal shifts of the transition lines with 4f3 configuration were investigated. The vibrational transitions of Nd3 + : srO.6Al20 3 were also investigated using Raman spectroscopy. The results of the study provide information on the suitability of Nd3+ : srO.6Al20 3 as a solid state laser material.

Preparation, Characterization and Spectroscopy of Eu3+ in Gd2O3 Nanorods

2008 ◽  
Vol 8 (3) ◽  
pp. 1398-1403 ◽  
Author(s):  
Liqin Liu ◽  
En Ma ◽  
Renfu Li ◽  
Xueyuan Chen
Keyword(s):  
Electron Microscopy ◽  
Fluorescence Spectra ◽  
Filling Factor ◽  
Energy Levels ◽  
Diffraction Field ◽  
X Ray Diffraction ◽  
Excitation Spectra ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron

Eu3+:Gd2O3 nanorods were prepared by a hydrothermal method. X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy, and Fourier transform-infrared spectroscopy were used to characterize the resulting samples. Emission and excitation spectra were studied using xenon excited spectroscopic experiments at 10 K. Energy transfer from Gd3+ to Eu3+, from the band gap of the host to Eu3+, and from Eu3+ (S6) to Eu3+ (C2) was observed. The energy levels of Eu3+ at the C2 site of cubic Gd2O3 were experimentally determined according to the fluorescence spectra at 10 K, and fit well with the theoretical values. The standard deviation for the optimal fit was 12.9 cm−1. The fluorescent lifetime of 5D0 (2.3 ms at 295 K) was unusually longer than that of the bulk counterparts (0.94 ms), indicating a small filling factor (0.55) for the nanorod volume. However the lifetime of 5D1 was much shorter than that of the bulk counterparts, 65 μs at 10 K, 37 μs at 295 K.

Spectroscopic properties of the Pr3+ ion in TeO2-WO3-PbO-La2O3 and TeO2-WO3-PbO-Lu2O3 glasses

Open Physics ◽  
2014 ◽  
Vol 12 (1) ◽  
Author(s):  
Bożena Burtan ◽  
Maciej Sitarz ◽  
Radosław Lisiecki ◽  
Witold Ryba-Romanowski ◽  
Piotr Jeleń ◽  
...  
Keyword(s):  
Refractive Index ◽  
Dispersion Relation ◽  
Fluorescence Spectra ◽  
Tellurite Glass ◽  
Spectroscopic Properties ◽  
Spectroscopic Studies ◽  
Luminescence Decay ◽  
Absorption And Fluorescence Spectra ◽  
Ofelt Theory ◽  
Glass Matrices

AbstractThe goal of this work was to investigate the spectroscopic properties of Pr3+ ions, embedded in two different tellurite glass matrices, TeO2-WO3-PbO-La2O3 and TeO2-WO3-PbO-Lu2O3. The absorption and fluorescence spectra have been recorded and analyzed in terms of the Judd-Ofelt theory along with the luminescence decay of the 3P0 and 1D2 levels of the Pr3+ ion. The spectroscopic studies were completed with ellipsometric measurements providing the dispersion relation of the refractive index of the investigated glasses.

scholarly journals Study the spectroscopic characteristics of Rhodamine B Dye in Ethanol and Methanol mixture and Calculation the Quantum Efficiency

2012 ◽  
Vol 9 (2) ◽  
pp. 352-358 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Quantum Efficiency ◽  
Rhodamine B ◽  
Fluorescence Spectra ◽  
Room Temperature ◽  
Energy Levels ◽  
Solvent Polarity ◽  
Wave Number ◽  
Absorption And Fluorescence Spectra ◽  
Spectroscopic Characteristics ◽  
Rhodamine B Dye

The effect of ethanol and methanol solvent, and their mixture has been studied on the absorption and fluorescence spectra of laser dye Rhodamine B at concentration of (10-4) Molar at room temperature. The molar absorption coefficient has been determined for mixture which was (3.223) at wave number (18181.8 cm-1), Also the Quantum Efficiency of the two solvents (ethanol and methanol) and their mixture have been calculated ,which was for mixture spectrum (38.94%) and it was larger comparing with other and solvents. The characteristics of spectrum has been determined by calculating (??) of absorption spectrum for the solvents and its mixture at maximum wave number ( ) cm-1 depending on solvent polarity and the transitions between molecular energy levels in each solvent of Rhodamine B dye .

scholarly journals Spectroscopic studies of the binding of bilirubin by ligandin and aminoazo-dye-binding protein A

1976 ◽  
Vol 157 (1) ◽  
pp. 211-216 ◽  
Author(s):  
E Tipping ◽  
B Ketterer ◽  
L Christodoulides ◽  
G Enderby
Keyword(s):  
Association Constant ◽  
Fluorescence Spectra ◽  
Binding Protein ◽  
Protein A ◽  
Spectroscopic Studies ◽  
Absorption And Fluorescence Spectra ◽  
Quantitative Studies ◽  
Dye Binding ◽  
Cotton Effects ◽  
Unbound Bilirubin

Ligandin and aminoazo-dye-binding protein A both bind bilirubin at a single site. Quantitative studies of the interactions using difference spectrophotometry show that at pH 7.0, protein A binds the tetrapyrrole with an association constant (K) greater than or equal to 2 × 10(7) litre/mol, whereas binding by ligandin is slightly weaker (K = 7 × 10(6) litre/mol) at this pH. The protein-bilirubin complexes give rise to absorption and fluorescence spectra quite different from those of unbound bilirubin and also to large Cotton effects. It appears that on binding to both proteins, the ligand is forced into a rigid twisted configuration in a hydrophobic environment. Ligandin and protein A resemble serum albumin in their interactions with bilirubin.

Studies of the effect of hydrogen bonding on the absorption and fluorescence spectra of all-trans-retinal at room temperature

1992 ◽  
Vol 70 (3) ◽  
pp. 880-887 ◽  
Author(s):  
S. Alex ◽  
H. Le Thanh ◽  
D. Vocelle
Keyword(s):  
Raman Spectroscopy ◽  
Hydrogen Bonding ◽  
Ground State ◽  
Fluorescence Spectra ◽  
Room Temperature ◽  
Tautomeric Equilibrium ◽  
Absorption And Fluorescence Spectra ◽  
Large Excess ◽  
Vis Spectroscopy ◽  
Uv Visible

Ultraviolet (UV)–visible and fluorescence spectra were obtained for complexes of ATR and TFA at different ratios and in four different solvents: hexane, chloroform, dichloromethane, and methanol. In the first three solvents, a large excess of TFA generates retinylic cations that absorb from 459 to 600 nm. Also, in CHCl3, Raman spectroscopy and fluorescence indicate that some aggregated species like ATR:(TFA)n, with λmax of ca. 470 nm, are present. In methanol, TFA protonates the solvent and it is CH3O+H2 which interacts with ATR so that only blue-shifted H-bonded ATR is present. From these results, it is shown that in the tautomeric equilibrium [Formula: see text], form (1) is always favored in the ground state whatever the solvent. In the excited state in hexane and in methanol, (1) is rapidly transformed into (2). In CH2Cl2 and CHCl3, this transformation is absent so that there is no energy dissipation, with the result that the retinal complexes become more unstable. Keywords: all-trans-retinal, fluorescence, H-bonds, trifluoroacetic acid, UV–vis spectroscopy.

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