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.

scholarly journals Kinetics of luminescence calcium gallate activated by Yb3+, Er3+ ions

2020 ◽  
Vol 23 (3) ◽  
pp. 213-221
Author(s):  
A. P. Mar`in ◽  
U. A. Mar`ina ◽  
V. A. Vorob`ev ◽  
R. V. Pigulev
Keyword(s):  
Rare Earth ◽  
Luminescence Intensity ◽  
Luminescent Properties ◽  
Rare Earth Ions ◽  
Luminescence Spectra ◽  
Excitation Spectra ◽  
Semiconductor Laser Diode ◽  
Intracenter Luminescence ◽  
Trivalent Rare Earth ◽  
Kinetics Of

The paper presents the results of a study of the luminescent properties of calcium gallate activated by trivalent rare earth ions Yb3+ and Er3+. IR luminescence spectra of samples with a single activator Ca1‑хYbxGa2O4,Ca1‑хErxGa2O4 were studied when excited by radiation sources with a wavelength of 940 and 790 nm, respectively. The dependence of the luminescence intensity of samples on the concentration of rare earth ions is obtained. When the two-activator composition of Ca1‑х‑yYbxEryGa2O4 is excited by a semiconductor laser diode with a wavelength of 940 nm, IR luminescence is registered in the regions of 980-1100 nm and 1450-1670 nm. The radiation in these bands corresponds to electronic transitions in Yb3+ and Er3+ ions, respectively. For a luminescence band with a maximum at a wavelength of 1540 nm, the excitation spectra were measured, the maximum intensity is at the wavelengths: 930, 941, 970, 980 nm. The dependence of the IR luminescence intensity of a solid solution of Ca1‑х‑yYbxEryGa2O4 on the concentration of Er3+ ions was studied. With an increase in the concentration of Er3+ ions in the luminescence spectra, there is a redistribution in the intensity of the bands belonging to Yb3+ and Er3+ ions, which indicates the presence of energy transfer processes between these ions. The kinetics of IR luminescence attenuation was studied for series with one and two activators: Ca1‑хYbxGa2O4,Ca1‑хErxGa2O4, Ca1‑х‑yYbxEryGa2O4. It is established that the luminescence attenuation occurs mainly according to the exponential law, which indicates the predominance of the intracenter luminescence mechanism in the studied structures. Based on the analysis of the excitation and luminescence spectra of experimental samples, conclusions are made about the interaction of Yb3+ and Er3+ activator ions in the crystal lattice of calcium gallate.

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.

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

Synthesis, Fluorescence Properties of 2-Acetyl-2'-Chloroacetanilide with Rare Earth Nitrates Complexes

2011 ◽  
Vol 219-220 ◽  
pp. 574-577
Author(s):  
Xi Shi Tai ◽  
Lin Tong Wang
Keyword(s):  
Rare Earth ◽  
Rare Earth Ions ◽  
Fluorescence Properties ◽  
Water Molecules ◽  
Single Crystal Diffraction ◽  
X Ray ◽  
Rare Earth Nitrates ◽  
Ft Ir ◽  
Coordinated Water ◽  
The Eu

The reaction of 2-acetyl-2'-chloroacetanilide (L) with rare earth nitrates in CH3CH2OH followed by recrystallization in CH3CH2OH gave rise to colorless block crystals materials. The complexes and ligand were analyzed by FAB, elemental analysis(C, H, N), FT-IR spectra, TG-DTA, molar conductivity and X-ray single crystal diffraction. The fluorescence properties of ligand and the Eu (Ⅲ) complex also have been investigated. The results of crystal structure and spectral data show that the rare earth ions coordinated with oxygen and nitrogen atoms of the ligand, the nitrate and coordinated water molecules. The Eu (Ⅲ) complex material shows characteristic red emissions.

The X-ray storage properties of barium phosphate doped with trivalent rare earth ions

1994 ◽  
Vol 141 (1) ◽  
pp. 231-238 ◽  
Author(s):  
W. J. Schipper ◽  
J. J. Hamelink ◽  
G. Blasse
Keyword(s):  
Rare Earth ◽  
Rare Earth Ions ◽  
X Ray ◽  
Trivalent Rare Earth ◽  
Storage Properties

Kathodo- und Photolumineszenz der Seltenerd-aktivierten Wirtsgitter Ba2La2B2+Te2O12 (B = Zn, Mg)

1986 ◽  
Vol 41 (6) ◽  
pp. 866-870 ◽  
Author(s):  
H.-D. Autenrieth ◽  
S. Kemmler-Sack
Keyword(s):  
Electronic Structure ◽  
Rare Earth ◽  
Visible Region ◽  
Host Lattice ◽  
Rare Earth Ions ◽  
New Host ◽  
Emission Efficiency ◽  
Transfer Processes ◽  
Trivalent Rare Earth ◽  
Host Lattices

By activation of the new host lattices Ba2La2B2+Te2O12 (B = Zn, Mg) with trivalent rare earth ions Ln3+ = Pr. Sm, Eu, Tb, Dy, Ho, Tm an emission in the visible region is observed. The influence of the electronic structure and concentration on the relative emission efficiency as well as the host lattice participation in the energy transfer processes are discussed.

Tunable emissions via the white region from Sr2Gd8(SiO4)6O2:RE3+ (RE3+: Dy3+, Tm3+, Eu3+) phosphors

2016 ◽  
Vol 40 (7) ◽  
pp. 6214-6227 ◽  
Author(s):  
Gattupalli Manikya Rao ◽  
G. Seeta Rama Raju ◽  
Sk. Khaja Hussain ◽  
E. Pavitra ◽  
P. S. V. Subba Rao ◽  
...  
Keyword(s):  
Rare Earth ◽  
White Light ◽  
Host Lattice ◽  
Rare Earth Ions ◽  
White Region ◽  
Light Region ◽  
Trivalent Rare Earth ◽  
Co Doped

Sr2Gd8(SiO4)6O2 is an excellent host lattice for tunable emissions via the white-light region when co-doped with suitable trivalent rare-earth ions.

Luminescence of trivalent rare earth ions in the yttrium aluminium borate non-linear laser crystal

2003 ◽  
Vol 102-103 ◽  
pp. 216-219 ◽  
Author(s):  
E. Cavalli ◽  
A. Speghini ◽  
M. Bettinelli ◽  
M.O. Ramírez ◽  
J.J. Romero ◽  
...  
Keyword(s):  
Rare Earth ◽  
Laser Crystal ◽  
Rare Earth Ions ◽  
Yttrium Aluminium ◽  
Aluminium Borate ◽  
Non Linear ◽  
Trivalent Rare Earth ◽  
Linear Laser
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