Er3+-Doped Silicon Prepared by Laser Doping

1993 ◽  
Vol 301 ◽  
Author(s):  
T. Asatsuma ◽  
P. Dodd ◽  
J. F. Donegan ◽  
J. G. Lunney ◽  
J. Hegarty
Keyword(s):  
Rare Earth ◽  
Pulsed Laser ◽  
Earth Metal ◽  
Optically Active ◽  
Rare Earth Ions ◽  
Molten Layer ◽  
Laser Doping ◽  
Doped Silicon ◽  
Preliminary Study ◽  
The Rare Earth

ABSTRACTWe have carried out an investigation of the laser doping of Si with rare-earth ions. In this technique a silicon surface coated with a thin layer of the rare-earth metal is melted with a pulsed laser, the dopant is mixed in the molten layer, and incorporated in the crystal during regrowth. Er was chosen for the main part of our work as it is the best characterized of the rare-earth ions in Si. Luminescence is observed around 1.54µm and is assigned to optical transitions on Er3+ ions. This preliminary study shows that this new technique is viable for the production of optically active Er3+ in Si.

Synthesis and characterization of the novel rare earth orthophosphates Y0.5Er0.5PO4 and Y0.5Yb0.5PO4

2016 ◽  
Vol 71 (1) ◽  
pp. 65-70 ◽  
Author(s):  
Daniel Schildhammer ◽  
Lucas L. Petschnig ◽  
Gerda Fuhrmann ◽  
Gunter Heymann ◽  
Martina Tribus ◽  
...  
Keyword(s):  
Rare Earth ◽  
Single Crystal ◽  
Structural Parameters ◽  
Earth Metal ◽  
Rare Earth Ions ◽  
The Novel ◽  
X Ray Diffraction ◽  
The Individual ◽  
New Compounds ◽  
The Rare Earth

AbstractThe new mixed rare earth (RE) orthophosphates Y0.5Er0.5PO4 and Y0.5Yb0.5PO4 were synthesized by a classical solid state reaction in an electrical furnace at 1200 °C. As starting materials, the corresponding rare earth oxides and diammonium hydrogen phosphate were used. The powder diffraction analyses revealed that the new compounds Y0.5Er0.5PO4 and Y0.5Yb0.5PO4 crystallize in a zircon-type structure being isostructural with the rare earth orthophosphate YPO4. Y0.5Er0.5PO4 and Y0.5Yb0.5PO4 crystallize in the tetragonal space group I41/amd (no. 141) with four formula units in the unit cell. The structural parameters based on Rietveld refinements are a = 687.27(2), c = 601.50(2) pm, V = 0.28412(1) nm3, Rp= 0.0143, and Rwp = 0.0186 (all data) for Y0.5Er0.5PO4 and a = 684.61(2), c = 599.31(2) pm, V = 0.28089(2) nm3, Rp = 0.0242, and Rwp = 0.0313 (all data) for Y0.5Yb0.5PO4. Furthermore, the structure of Y0.5Er0.5PO4 was refined from single-crystal X-ray diffraction data: a = 687.78(5), c = 601.85(4) pm, V = 0.28470(5) nm3, R1= 0.0165, and wR2 = 0.0385 (all data). In both compounds, the rare earth metal ions are eightfold coordinated by oxygen atoms, forming two unique interlocking tetrahedra with two individual RE–O distances. The tetrahedral phosphate groups [PO4]3– are slightly distorted in both compounds. The individual rare earth ions share a common position (Wyckoff site 4a). The presence of two rare earth ions in the structures of the new orthophosphates Y0.5Er0.5PO4 and Y0.5Yb0.5PO4 was additionally confirmed by single-crystal EDX spectroscopy revealing a ratio of 1:1.

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.

scholarly journals High-pressure synthesis of REB5O8(OH)2 (RE = Ho, Er, Tm)

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Michael Zoller ◽  
Hubert Huppertz
Keyword(s):  
High Pressure ◽  
Rare Earth ◽  
Ir Spectroscopy ◽  
Earth Metal ◽  
Monoclinic Space Group ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure Solution ◽  
Pressure Synthesis ◽  
The Rare Earth

AbstractThe rare earth oxoborates REB5O8(OH)2 (RE = Ho, Er, Tm) were synthesized in a Walker-type multianvil apparatus at a pressure of 2.5 GPa and a temperature of 673 K. Single-crystal X-ray diffraction data provided the basis for the structure solution and refinement. The compounds crystallize in the monoclinic space group C2 (no. 5) and are composed of a layer-like structure containing dreier and sechser rings of corner sharing [BO4]5− tetrahedra. The rare earth metal cations are coordinated between two adjacent sechser rings. Further characterization was performed utilizing IR spectroscopy.

Expanding the Rare-Earth Metal BINOLate Catalytic Multitool beyond Enantioselective Organic Synthesis

2021 ◽  
Author(s):  
Grace B. Panetti ◽  
Jerome R. Robinson ◽  
Eric J. Schelter ◽  
Patrick J. Walsh
Keyword(s):  
Rare Earth ◽  
Organic Synthesis ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
The Rare Earth

ChemInform Abstract: Eu2(CN2)3and KEu[Si(CN2)4]: Missing Members of the Rare Earth Metal Carbodiimide and Tetracyanamidosilicate Series.

ChemInform ◽  
2016 ◽  
Vol 47 (45) ◽  
Author(s):  
Danuta Dutczak ◽  
Markus Stroebele ◽  
David Enseling ◽  
Thomas Juestel ◽  
H.-Juergen Meyer
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
The Rare Earth
Sign in / Sign up

Export Citation Format

Share Document