Analysis of thermal glow curves in rare-earth-doped CaF2 crystals

1969 ◽  
Vol 47 (15) ◽  
pp. 1637-1638 ◽  
Author(s):  
M. Schlesinger ◽  
A. Krishna Menon
Keyword(s):  
Rare Earth ◽  
Thermal Activation ◽  
Activation Energies ◽  
Rare Earth Ions ◽  
Hole Trapping ◽  
Order Of Kinetics ◽  
Close Proximity ◽  
Rare Earth Doped ◽  
Trapping Sites ◽  
The Rare Earth

The main parameters, that is, thermal activation energies, frequency factors, and order of kinetics, are calculated for some glow peaks in rare-earth-doped CaF2. From the results, it is inferred that the hole trapping sites are in close proximity to the rare-earth ions.

Rare-Earth Doped Silicon-Rich Silica: Evidence for Energy Transfer between Silicon Microclusters and Rare-Earth Ions

1994 ◽  
Vol 358 ◽  
Author(s):  
A.J. Kenyon ◽  
P.F. Trwoga ◽  
M. Federighi ◽  
C.W. Pitt
Keyword(s):  
Rare Earth ◽  
Visible Region ◽  
Rare Earth Ions ◽  
Excitation Wavelength ◽  
Rare Earth Ion ◽  
Absorption Bands ◽  
Strong Luminescence ◽  
Doped Silicon ◽  
Rare Earth Doped ◽  
The Rare Earth

ABSTRACTWe report the fabrication of rare-earth doped silicon-rich silica thin films by PECVD. The films exhibit absorption edges in the visible region of the optical spectrum consistent with the presence of silicon microclusters. Weak visible photoluminescence due to silicon microclusters is observed. In addition, strong luminescence from the rare-earth ion is obtained even when excited away from characteristic absorption bands; indeed, the luminescence intensity is largely independent of excitation wavelength below 514 nm. We ascribe this to excitation of silicon microclusters followed by an efficient transfer of energy to the rare-earth ions.The very broad absorption of this material opens up the possibility for flashlamp-pumped optoelectronic devices. In addition, we report the fabrication of silicon-rich silica films by PECVD. We show that the optical properties of these films are consistent with the presence of silicon microclusters and show absorption spectra similar to those of the rare-earth doped silicon-rich silica samples. This supports the hypothesis that the principal absorbing species in the rare-earth doped films is microclustered silicon

scholarly journals Synthesis and Characterization of Doped and Undoped ZnO Nanostructures

2006 ◽  
Vol 12 (4) ◽  
pp. 327-330 ◽  
Author(s):  
Katie E. McBean ◽  
Matthew R. Phillips ◽  
Ewa M. Goldys
Keyword(s):  
Rare Earth ◽  
Earth Metal ◽  
Rare Earth Ions ◽  
Near Band Edge ◽  
Band Edge Emission ◽  
Ethanolic Solution ◽  
Edge Emission ◽  
Rare Earth Doped ◽  
The Rare Earth

Zinc oxide (ZnO) nanoparticles have been produced using precipitation methods from ethanolic solution. Rare-earth metal doping was performed, and the effect of lithium codoping on the luminescence properties of the rare-earth doped products was assessed. The resulting particles were characterized using cathodoluminescence and scanning electron microscopy. It was found that lithium significantly enhanced the cathodoluminescence signal from the rare-earth ions, which has been attributed to the increased integration of the rare-earth ions into the ZnO structure. The nanophase ZnO products were also annealed in argon, hydrogen, and oxygen, with hydrogen being the most successful for removing the broad defect emission present in as-grown samples and enhancing the ZnO near band edge emission.

RELAXATION PROCESS OF ELECTORON-HOLE PAIRS IN Yb-DOPED AlAs/GaAs SUPERLATTICE IN HIGH MAGNETIC FIELDS

2007 ◽  
Vol 21 (08n09) ◽  
pp. 1481-1485 ◽  
Author(s):  
TADASHI TAKAMASU ◽  
KOICHI SATO
Keyword(s):  
Rare Earth ◽  
Molecular Beam Epitaxy ◽  
Magnetic Fields ◽  
Relaxation Process ◽  
Molecular Beam ◽  
High Magnetic Fields ◽  
Molecular Beam Epitaxy Method ◽  
Rare Earth Doped ◽  
Photoluminescence Peak ◽  
The Rare Earth

The rare-earth doped AlAs/GaAs superlattices were grown by molecular beam epitaxy method. From the magneto-oscillation of the interband broad photoluminescence peak, electrons accumulated in the well were analyzed.

scholarly journals On the Hydration of the Rare Earth Ions in Aqueous Solution

2020 ◽  
Vol 49 (3) ◽  
pp. 316-331 ◽  
Author(s):  
Wolfram W. Rudolph ◽  
Gert Irmer
Keyword(s):  
Aqueous Solution ◽  
Rare Earth ◽  
Rare Earth Ions ◽  
The Rare Earth

The fluorescence of polyamidoamine dendrimers peripherally modified with 1,8-naphthalimide groups: Effect of the rare earth ions and protons

2007 ◽  
Vol 126 (2) ◽  
pp. 515-530 ◽  
Author(s):  
Shi-Ping Yang ◽  
Lin Lin ◽  
Liang-Zhun Yang ◽  
Jia-Min Chen ◽  
Qiong-Qiong Chen ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Ions ◽  
Polyamidoamine Dendrimers ◽  
The Rare Earth

Effects of the rare-earth ions on some properties of a nickel-zinc ferrite

1994 ◽  
Vol 6 (29) ◽  
pp. 5707-5716 ◽  
Author(s):  
N Rezlescu ◽  
E Rezlescu ◽  
C Pasnicu ◽  
M L Craus
Keyword(s):  
Rare Earth ◽  
Zinc Ferrite ◽  
Rare Earth Ions ◽  
Nickel Zinc ◽  
The Rare Earth
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