Influence of the P2O5/Al2O3 co-doping on the local environment of erbium ions and on the 1.5μm quantum efficiency of Er3+-borosilicate glasses

2014 ◽  
Vol 36 (5) ◽  
pp. 926-931 ◽  
Author(s):  
Kevin Bourhis ◽  
Nadia G. Boetti ◽  
Joona Koponen ◽  
Daniel Milanese ◽  
Laetica Petit
Keyword(s):  
Quantum Efficiency ◽  
Local Environment ◽  
Borosilicate Glasses ◽  
Co Doping ◽  
Erbium Ions

Enhanced, shortened and tunable emission in Eu3+ doped borosilicate glasses by Cu+ co-doping

2019 ◽  
Vol 87 ◽  
pp. 80-83 ◽  
Author(s):  
Yang Wang ◽  
Ilaria Di Sarcina ◽  
Alessia Cemmi ◽  
Stefania Baccaro ◽  
Guorong Chen
Keyword(s):  
Borosilicate Glasses ◽  
Co Doping ◽  
Tunable Emission

Photoluminescence Study of Energy Transfer Processes in Erbium Doped AlxGal−xAs Grown by MBE

1993 ◽  
Vol 301 ◽  
Author(s):  
Tong Zhang ◽  
J. Sun ◽  
N.V. Edwards ◽  
D.E. Moxey ◽  
R.M. Kolbas ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Energy Levels ◽  
Coupling Efficiency ◽  
Thermal Quenching ◽  
Energy Bands ◽  
Doped Semiconductors ◽  
Co Doping ◽  
Erbium Ions ◽  
Erbium Doped ◽  
First Time

ABSTRACTSharp photoluminescence from the intra-4f shell of Er3+ is observed from erbium doped AlxGal-xAs (0 ≤x ≤ 1) grown by molecular beam epitaxy. The intensity of the luminescence from the erbium is strongly dependent on the aluminum composition with a maximum at x ≈ 0.6. We will present a model that explains the variation in intensity based on the energy transfer coupling efficiency between the host semiconductor and the optically active erbium ions. The coupling efficiency is dominated by the alignment or misalignment of the erbium energy levels with the energy bands of the host semiconductor and by the excess carrier lifetime in the host. The data and model, which are presented here for the first time, are consistent with our previous work on the effects of co-doping with Be or Si and with other workers' measurements of thermal quenching in rare earth doped semiconductors.

95Mo NMR Study of Crystallization in Model Nuclear Waste Glasses

2008 ◽  
Vol 1124 ◽  
Author(s):  
Scott Kroeker ◽  
Ian Farnan ◽  
Sophie Schuller ◽  
Thierry Advocat
Keyword(s):  
Nuclear Waste ◽  
Spectral Characteristics ◽  
Sodium Molybdate ◽  
Local Environment ◽  
Magic Angle Spinning ◽  
Mas Nmr ◽  
Sharp Peak ◽  
Magic Angle ◽  
Borosilicate Glasses ◽  
Nmr Study

Abstract95Mo magic-angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy is surprisingly sensitive to the local environment of tetrahedral molybdate species. A series of compounds related to expected crystallization products in nuclear waste glasses are probed to calibrate their spectral characteristics. Glasses formed with fast and slow quenching show a glassy peak corresponding to tetrahedral molybdate species. With slow quenching, a prominent sharp peak is observed, representing crystallinity. In sodium-borosilicate glasses with 2.5 mol% MoO3, the sharp peak corresponds to pure crystalline sodium molybdate. Cesium-sodium and lithium-sodium borosilicate glasses with Mo show crystalline peaks as well, and suggest that NMR may potentially be used to characterize mixed-cation molydates and more complex phase assemblages. While precise quantification of Mo in different phases is likely to be time-consuming, reasonable estimates can be obtained routinely, making 95Mo MAS NMR a useful tool for investigating phase separation and crystallization in model nuclear waste materials.

Enhanced quantum efficiency and thermal stability in CaWO4:Eu3+ phosphor based on structural modification induced by co-doping Al3+

2020 ◽  
Vol 225 ◽  
pp. 117351
Author(s):  
Shaojie Bai ◽  
Yun Liu ◽  
Guoqiang Tan ◽  
Wenlong Liu ◽  
Dinghan Liu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Quantum Efficiency ◽  
Structural Modification ◽  
Co Doping

Local environment of Zn in zirconium borosilicate glasses determined by X-ray absorption spectroscopy

2000 ◽  
Vol 261 (1-3) ◽  
pp. 155-162 ◽  
Author(s):  
David A. McKeown ◽  
Isabelle S. Muller ◽  
Andrew C. Buechele ◽  
Ian L. Pegg
Keyword(s):  
Absorption Spectroscopy ◽  
Local Environment ◽  
Borosilicate Glasses ◽  
X Ray ◽  
X Ray Absorption

X-ray Absorption Studies of Vanadium Valence and Local Environment in Borosilicate Waste Glasses

2002 ◽  
Vol 713 ◽  
Author(s):  
David A. McKeown ◽  
Isabelle S. Muller ◽  
Keith S. Matlack ◽  
Ian L. Pegg
Keyword(s):  
Local Environment ◽  
Solubility Data ◽  
Borosilicate Glasses ◽  
Sulfur Solubility ◽  
X Ray ◽  
Reducing Conditions ◽  
Absorption Studies ◽  
Vanadium Sulfide ◽  
X Ray Absorption ◽  
Sulfur Containing

ABSTRACTXANES and EXAFS data were collected and analyzed to characterize vanadium in borosilicate glasses used for immobilization of sulfur-containing nuclear wastes. Earlier studies suggested that adding vanadium to the melt improves sulfur solubility. Data are presented for a variety of borosilicate glasses, some containing sulfur and some sulfur-free, that have V2O5 concentrations as high as 12 wt%, and for crystalline vanadium sulfide, silicate, and oxide standards. The data for all glasses investigated indicate that most or all vanadium has a +5 valence and is tetrahedrally coordinated by oxygen atoms. Both XANES and EXAFS also show that glasses synthesized under reducing conditions can have pentacoordinated V+4 populations up to approximately 20 to 25% of all vanadium present with the remainder being V+5O4. There is no evidence from XANES or EXAFS of V-S bonds in any of the glasses investigated.

X-ray absorption studies of the local environment of Zr in high-zirconia borosilicate glasses

1999 ◽  
Vol 258 (1-3) ◽  
pp. 98-109 ◽  
Author(s):  
David A. McKeown ◽  
Isabelle S. Muller ◽  
Andrew C. Buechele ◽  
Ian L. Pegg
Keyword(s):  
Local Environment ◽  
Borosilicate Glasses ◽  
X Ray ◽  
Absorption Studies ◽  
X Ray Absorption
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