Triboluminescence of Rare-Earth-Doped Aluminosilicates and Its Application to Sensing of Structural Damage

1999 ◽  
Vol 604 ◽  
Author(s):  
Katsuhisa Tanaka ◽  
Tsuguo Ishihara ◽  
Koji Fujita ◽  
Kazuyuki Hirao
Keyword(s):  
Rare Earth ◽  
Structural Damage ◽  
Local Environment ◽  
Rare Earth Ions ◽  
Emission Lines ◽  
Photoluminescence Spectra ◽  
The Difference ◽  
Ligand Fields ◽  
Rare Earth Doped ◽  
The Eu

AbstractIntense triboluminescence has been observed in rare-earth-doped aluminosilicates such as BaAl2Si2O8and SrAl2Si2O8doped with Eu2+, Tb3+, or Dy3+. The triboluminescence is caused by the excitation of and emission from rare-earth ions doped in the crystals. A discrepancy in the wavelength of maximum emission intensity between triboluminescence and photoluminescence spectra is observed for the 4f65d-4f7 transition of Eu2+, whereas the peak positions and the relative intensities of emission lines in triboluminescence and photoluminescence spectra are almost the same as each other for the 4f-4f transitions of Th3+ and Dy3+. This is because the 5d levels, which are more significantly affected by ligand fields than the 4f levels, contribute to the transition of Eu2+. It is thought that the difference in local environment around the Eu2+ between on the fractured surface and within the bulk brings about the discrepancy between triboluminescence and photoluminescence spectra

Magnetic properties of (Sr1.85Ln0.15)FeMoO6 with Ln = Sr, La, Ce, Pr, Nd, Sm and Eu

2011 ◽  
Vol 239-242 ◽  
pp. 3109-3112 ◽  
Author(s):  
Qin Zhang ◽  
Qing Wang ◽  
Zhen Cui Sun ◽  
Ke Yan Wang
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Ionic Radius ◽  
Single Phase ◽  
Magnetic Measurements ◽  
Rare Earth Ions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Rare Earth Doped ◽  
The Eu

Rare-earth-doped compounds (Sr1.85Ln0.15)FeMoO6(Ln=Sr, La, Ce, Pr, Nd, Sm and Eu) have been prepared by solid-state reaction. Crystal structure and magnetic properties were investigated by means of X-ray diffraction and magnetic measurements. All the samples are single phase and belong to the I4/m space group. Due to the competing contributions of electron doping and steric effects, the unit-cell volume of the doped compounds changes slightly and does not vary systematically with the ionic radius of the rare-earth ions. The temperature dependence of the magnetization of (Sr1.85Ln0.15)FeMoO6indicates that the Curie temperature of the doped compounds has increased upon doping, except for the Eu-doped compound.

Thermoluminescence and X-Ray Stimulated Luminescence of CaF2:Eu Crystals

1973 ◽  
Vol 51 (4) ◽  
pp. 382-388 ◽  
Author(s):  
R. W. Ward ◽  
P. W. Whippey
Keyword(s):  
Spectral Analysis ◽  
Rare Earth ◽  
Single Crystals ◽  
Rare Earth Ions ◽  
Recombination Process ◽  
Emission Lines ◽  
Luminescence Spectra ◽  
X Ray ◽  
Trivalent Rare Earth ◽  
The Eu

The X-ray luminescence and thermoluminescence due to Eu ions in CaF2 have been investigated. Thermoluminescent glow curves of CaF2 single crystals containing several different concentrations of europium have been measured between 4.2 K and 400 K. Spectral analysis of the two major glow peaks at 92 K and 240 K shows that the luminescence is due mainly to Eu2+ ions. The available evidence suggests the thermoluminescence of Eu2+ in CaF2 is a hole-type recombination process similar to the generally accepted mechanism for thermoluminescence from trivalent rare-earth ions in CaF2. In addition to the Eu2+ emission, lines are observed at lower energies in the X-ray luminescence spectra due to Eu3+ ions in at least three different symmetry sites.

Achieving high thermal stability of different rare-earth ions in a single matrix host via the manipulation of the local structure by a solid solution

2020 ◽  
Vol 22 (28) ◽  
pp. 16294-16300
Author(s):  
Xiuxia Yang ◽  
Lei Zhao ◽  
Zhichao Liu ◽  
Shuyu Tian ◽  
Hao Zhang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Solid Solution ◽  
Rare Earth ◽  
Local Structure ◽  
Local Environment ◽  
High Thermal Stability ◽  
Rare Earth Ions ◽  
Single Matrix ◽  
Thermal Stability Of

Manipulating the local environment of CAS by substitution of Al3+–Y3+ for Si4+–Ca2+ to achieve more stability in the structure of CYA.

scholarly journals Photoluminescence and Cathodoluminescence of GaN doped with Pr

2000 ◽  
Vol 5 (S1) ◽  
pp. 817-823
Author(s):  
H. J. Lozykowski ◽  
W. M. Jadwisienczak ◽  
I. Brown
Keyword(s):  
Rare Earth ◽  
Thermal Annealing ◽  
Spectral Range ◽  
Atmospheric Pressure ◽  
Rare Earth Ions ◽  
Emission Lines ◽  
Decay Kinetics ◽  
Temperature Range ◽  
Characteristic Emission ◽  
Kinetics Measurement

In this paper we have reported the observation of visible photoluminescence (PL) and cathodoluminescence (CL) of Pr implanted in GaN. The implanted samples were given isochronal thermal annealing treatments at a temperature of 11000 C in NH3, N2, Ar2, and in forming gas N2 +H2, at atmospheric pressure to recover implantation damages and activate the rare earth ions. The sharp characteristic emission lines corresponding to Pr3+ intra-4fn-shell transitions are resolved in the spectral range from 350 nm to 1150 nm, and observed over the temperature range of 12 K-335 K. The PL and CL decay kinetics measurement was performed for 3P1, 3P0 and 1D2 levels.

VUV–UV Photoluminescence Spectra of Strontium Orthophosphate Doped with Rare Earth Ions

2002 ◽  
Vol 167 (2) ◽  
pp. 435-440 ◽  
Author(s):  
Hongbin Liang ◽  
Ye Tao ◽  
Qiang Su ◽  
Shubin Wang
Keyword(s):  
Rare Earth ◽  
Rare Earth Ions ◽  
Photoluminescence Spectra

Luminescent Properties of Rare Earth Doped AlF3-Based Glasses

1991 ◽  
Vol 244 ◽  
Author(s):  
L. R. Copeland ◽  
W. A. Reed ◽  
M. R. Shahriari ◽  
T. Iqbal ◽  
P. Hajcak ◽  
...  
Keyword(s):  
Rare Earth ◽  
Optical Fibers ◽  
Luminescent Properties ◽  
Rare Earth Ions ◽  
Ion Concentration ◽  
Fluoride Glass ◽  
Oxide Glasses ◽  
Low Loss ◽  
Rare Earth Ion ◽  
Rare Earth Doped

ABSTRACTRare earth ions can easily be incorporated into fluoride glasses in moderate to large concentrations and, due to their low phonon energy, these glasses appear to have many advantages over oxide glasses as hosts for rare earth ions used in optical amplifiers and lasers. We have therefore investigated the optical properties of Pr3+, Pr3+/Yb3+ and Pr3+/Yb3+/Lu3+ doped bulk AIF3-based glass samples as a function of rare earth ion concentration. We find that the addition of 2 wt% of Yb increases the fluorescence of Pr3+ at 1.32 μm by a factor of 35 when excited with 488 nm radiation. The fluorescence intensity and excited state lifetimes are found to be comparable to those measured for Pr in a ZBLAN host. Since it has also been demonstrated that optical fibers drawn from AIF3-based glasses exhibit relatively low loss (< 0.05 dB/m) and posses superior chemical durability compared to other fluotide glasses, it is possible that AIF3 glasses may become the fluoride glass of choice for practical fiber laser and amplifier applications.

The Radiation Effect Mechanism of Some Rare Earth Doped BaF2 Crystal

1994 ◽  
Vol 348 ◽  
Author(s):  
Gu Mu ◽  
Chen Lingyan ◽  
Du Jie ◽  
Xiang Kaihua ◽  
Chen Gang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Rare Earth ◽  
Energy Level ◽  
Radiation Effect ◽  
Effect Mechanism ◽  
Effect Model ◽  
Baf2 Crystal ◽  
Rare Earth Doped ◽  
The Eu

ABSTRACTIn this paper, we used the Discrete Variational Xα, (DV-Xα) method to calculate the energy level of some rare earth doped BaF2 crystals and indicated that the Eu, Dy and Yb elements will change their valence from +3 to +2 under irradiation and thus change the optical properties of the crystals.The results show that this radiation effect model presented agree well with experiments.

The Difference between Rare Earth Ions and Alkaline Earth Metal Ions in DNA Condensation Process

2011 ◽  
Vol 694 ◽  
pp. 613-615
Author(s):  
Jun Zhang ◽  
Xiao Ting Shi ◽  
Wei Guo ◽  
Zhong Zhang ◽  
Hong Yang
Keyword(s):  
Rare Earth ◽  
Metal Ions ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Dna Condensation ◽  
Rare Earth Ions ◽  
Alkaline Earth Metal ◽  
Condensation Process ◽  
Alkaline Earth Metal Ions ◽  
The Difference

The structural transition of DNA double-stranded induced by Ce3+ or Mg2+ ions was investigated in this paper. By atomic force microscopy, different types of condensed DNA structures were observed at the presence of Ce3+ or Mg2+ ions. The results show that there are some differences between rare earth ions and alkaline earth metal ions in the DNA condensation process.

scholarly journals Vibrational, Thermal, and Physical Characterizations of Some Zinc Niobo Tellurite Glasses Doped with Rare Earth (Eu, Dy)-=SUP=-*-=/SUP=-

2021 ◽  
Vol 129 (4) ◽  
pp. 527
Author(s):  
Afrash Ejigu A ◽  
K.P. Ramesh ◽  
Gajanan Honnavar
Keyword(s):  
Rare Earth ◽  
Packing Density ◽  
Local Environment ◽  
Peak Shift ◽  
Rare Earth Ions ◽  
Physical Parameters ◽  
Tellurite Glasses ◽  
Rare Earth Ion ◽  
Raman Spectroscopic ◽  
Doped Glasses

In this communication, we report physical and thermal properties along with Raman spectroscopic investigations on Zinc Niobo Tellurite glass systems doped with Eu2O3 and Dy2O3 at the expense of TeO2. The glasses have been synthesized by the melt quenching technique. Physical parameters like density, molar volume, packing density were estimated. The density of the un-doped glasses increases with increasing mol&#37; of the modifier (ZnO) whereas the glass transition temperature (Tg) decreases. We have observed an increase in the density of the base glass systems which are doped with rare earth (RE) dopants. The packing density of the un-doped glasses remains almost constant with increasing modifier content suggesting that there is not much change in the local environment. Raman spectra were recorded at room temperature and assigned to TeO4 and TeO3 structural units in these glasses. The peak shift, full width at half maximum (FWHM) of the de-convoluted Raman peaks were analyzed to get information about the local environment. It is observed that these compositions of tellurite glasses are good host materials for rare earth ions as they offer voids in the network. Further, it was observed that the rare earth ion doping has not affected the local environment of the glasses; Dy3+ ions have a slightly higher tendency to polarize Te-O bonds than the Eu3+ ions. Keywords: Niobium-based tellurite glasses, XRD, DSC, FTIR.

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