scholarly journals Spectroscopic Studies of the Behavior of Eu3+on the Luminescence of Cadmium Tellurite Glasses

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
I. V. García-Amaya ◽  
Ma. E. Zayas ◽  
J. Alvarado-Rivera ◽  
E. Álvarez ◽  
S. A. Gallardo-Heredia ◽  
...  
Keyword(s):  
Raman Spectra ◽  
Glass Matrix ◽  
Light Emission ◽  
Spectroscopic Studies ◽  
Amorphous Structure ◽  
Nitrate Hexahydrate ◽  
Europium Nitrate ◽  
Oxide Glasses ◽  
Quenching Method ◽  
Europium Nitrate Hexahydrate

The effect of europium doping on the photoluminescence of ZnO-CdO-TeO2glasses is analyzed. TeO2-based glasses are of high interest as hosts for laser glasses. The Eu-doped oxide glasses were prepared by the conventional melt-quenching method. Five different concentrations of europium nitrate hexahydrate that varied from 0.3 to 1.5 mol% were used. SEM observations revealed the formation of zinc aluminate spinel and disperse droplets of liquid-liquid phase separation in the glasses. X-Ray diffraction reveals the amorphous structure of the fabricated glasses. FT-IR and Raman spectra show the presence of TeO4and TeO3+1/TeO3units that conform with the glass matrix. Raman spectra evidenced a band located at 1556 cm−1that can be related to interstitial molecular oxygen in the glass matrix. Photoluminescence of the glasses showed light emission due to the following europiumtransitions from itsD52,D51, andD50levels to itsF7Jmanifolds:D52→F70(468 nm),D52→F72(490 nm),D52→F73(511 nm),D51→F71(536 nm),D51→F72(554 nm),D50→F70(579.5 nm),D50→F71(592 nm),D50→F72(613 nm),D50→F73(652 nm), andD50→F74(490 nm). The estimated decay time,τ, was 0.4 ms for all the glasses.

Vibronic spectra of Europium nitrate hexahydrate

1994 ◽  
Vol 60 (3-4) ◽  
pp. 185-192 ◽  
Author(s):  
V. I. Tsaryuk ◽  
V. D. Savchenko ◽  
N. L. Aryutkina ◽  
T. B. Chenskaya
Keyword(s):  
Nitrate Hexahydrate ◽  
Europium Nitrate ◽  
Vibronic Spectra ◽  
Europium Nitrate Hexahydrate

The luminescence of europium nitrate hexahydrate, Eu(NO3)3·6H2O

1988 ◽  
Vol 142 (1) ◽  
pp. 165-168 ◽  
Author(s):  
G. Blasse ◽  
G.J. Dirksen ◽  
J.P.M. van Vliet
Keyword(s):  
Nitrate Hexahydrate ◽  
Europium Nitrate ◽  
Europium Nitrate Hexahydrate

Thermal properties of europium nitrate hexahydrate Eu(NO3)3·6H2O

2016 ◽  
Vol 128 (3) ◽  
pp. 1353-1358 ◽  
Author(s):  
P. Melnikov ◽  
I. V. Arkhangelsky ◽  
V. A. Nascimento ◽  
L. C. S. de Oliveira ◽  
A. F. Silva ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Nitrate Hexahydrate ◽  
Europium Nitrate ◽  
Europium Nitrate Hexahydrate

ChemInform Abstract: Luminescence of Europium Nitrate Hexahydrate, Eu(NO3)3·6 H2O.

ChemInform ◽  
1988 ◽  
Vol 19 (17) ◽  
Author(s):  
G. BLASSE ◽  
G. J. DIRKSEN ◽  
J. P. M. VAN VLIET
Keyword(s):  
Nitrate Hexahydrate ◽  
Europium Nitrate ◽  
Europium Nitrate Hexahydrate

scholarly journals Raman Spectra of Nanodiamonds: New Treatment Procedure Directed for Improved Raman Signal Marker Detection

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Raoul R. Nigmatullin ◽  
Dumitru Baleanu ◽  
Diana Povarova ◽  
Numan Salah ◽  
Sami S. Habib ◽  
...  
Keyword(s):  
Raman Spectra ◽  
High Refractive Index ◽  
Spectroscopic Studies ◽  
Raman Signal ◽  
Heating Rates ◽  
Inert Core ◽  
Optimal Linear ◽  
Linear Smoothing ◽  
New Treatment ◽  
Increasing Temperature

Detonation nanodiamonds (NDs) have shown to be promising agents in several industries, ranging from electronic to biomedical applications. These NDs are characterized by small particle size ranging from 3 to 6 nm, while having a reactive surface and a stable inert core. Nanodiamonds can exhibit novel intrinsic properties such as fluorescence, high refractive index, and unique Raman signal making them very attractive imaging agents. In this work, we used several nanodiamond preparations for Raman spectroscopic studies. We exposed these nanodiamonds to increasing temperature treatments at constant heating rates (425–575°C) aiding graphite release. We wanted to correlate changes in the nanodiamond surface and properties with Raman signal which could be used as adetection marker. These observations would hold potential utility in biomedical imaging applications. First, the procedure of optimal linear smoothing was applied successfully to eliminate the high-frequency fluctuations and to extract the smoothed Raman spectra. After that we applied the secondary Fourier transform as the fitting function based on some significant set of frequencies. The remnant noise was described in terms of the beta-distribution function. We expect this data treatment to provide better results in biomolecule tracking using nanodiamond base Raman labeling.

Raman Spectroscopic Studies of the Vulcanization of Rubbers. III. Studies of Vulcanization Systems Based on 2-Mercaptobenzothiazole

1972 ◽  
Vol 45 (1) ◽  
pp. 173-181 ◽  
Author(s):  
M. M. Coleman ◽  
J. R. Shelton ◽  
J. L. Koenig
Keyword(s):  
Raman Spectra ◽  
Raman Line ◽  
Lauric Acid ◽  
Spectroscopic Studies ◽  
Type I ◽  
Raman Spectroscopic ◽  
Major Significance ◽  
Sulfur Vulcanization ◽  
Cyclic Sulfide

Abstract The shoulder observed at approximately 440 cm−1 in Raman spectra of CB vulcanizates prepared from MBT based vulcanizing systems has been shown to consist of two components. There are Raman lines contributing at 440 cm−1 and 424 cm−1. The former is due to ZnO present as an extra-network material while the latter appears to be associated with polysulfidic structures. The Raman line at 505 cm−1 seen in extracted vulcanizates prepared from CB-MBT-Sulfur-ZnO-Lauric acid recipes does not appear to be solely due to disulfidic structures. The major contribution appears to be associated with an unsaturated cyclic sulfide and is most probably due to a structure of the type (I). If the assignment to cyclic sulfidic structures such as (I) is confirmed, it will have major significance with regard to the mechanism of accelerated sulfur vulcanization.

Resonance Raman labels: spectroscopic studies on cis- and trans-4-benzylidene-2-phenyl-Δ2 -oxazolin-5-one and an isotopically substituted analog

1978 ◽  
Vol 56 (2) ◽  
pp. 232-239 ◽  
Author(s):  
K. Kumar ◽  
D. J. Phelps ◽  
P. R. Carey
Keyword(s):  
Raman Spectra ◽  
Electronic Transition ◽  
Raman Band ◽  
Resonance Raman ◽  
Spectroscopic Studies ◽  
Trans Isomers ◽  
Absorption Bands ◽  
Cis And Trans Isomers ◽  
Raman Excitation Profiles ◽  
Cis And Trans

The absorption and preresonance Raman spectra of cis- and trans-4-benzylidene-2-phenyl-Δ2-oxazoIin-5-one are reported. Although steric considerations suggest that the π electron pathway in the cis isomer is considerably distorted compared to the trans isomer, the Raman and absorption spectra of the two isomers are strikingly similar. Preresonance Raman excitation profiles for the cis and trans isomers indicate that the main features in the Raman spectra owe their intensity to coupling to the 360 nm absorption band present in both isomers. It is proposed that both the electronic dipole transition responsible for this absorption and the vibrational modes giving rise to the intense Raman bands are localized in the —C=C—N=C—Ph part of the molecule. Thus the main Raman and absorption bands are insensitive to isomerization in the benzylidene portion. Support for a localized electronic transition, polarized along the —C=C—N=C—Ph long axis, comes from Raman depolarization ratio (ρ) measurements which show that ail intense Raman features in both cis and trans isomers have ρ ∼ 0.33. Further support comes from ir and resonance Raman spectra of trans-4-(4-dimethylamino-3-nitrobenzylidene)-2-phenyloxazolin-5-one substituted either with 13C in the 4 position, or with 15N, in the oxazolinone ring. These spectra indicate that the main Raman feature seen in all 4-benzylidene-2-phenyloxazolinonesat 1561 cm−1 is a symmetric stretching mode associated with the —C=C—N=C— chain and that this feature has some C=N stretching character. The substitution experiments also show that the weak 1654 cm−1 Raman band has a high degree of C=C stretching character and may represent an essentially antisymmetric mode from the C=C—N=C moiety. The preresonance Raman excitation profiles show that the intensity enhancement follows an FB2 type dependence. The utility of the Raman spectrum as a probe for the chromophore responsible for the electronic transition in a highly conjugated system is discussed.

Sign in / Sign up

Export Citation Format

Share Document