The charge imbalance in ultracold plasmas

2016 ◽  
Vol 23 (9) ◽  
pp. 092102 ◽  
Author(s):  
Tianxing Chen ◽  
Ronghua Lu ◽  
Li Guo ◽  
Shensheng Han
Keyword(s):  
Ultracold Plasmas ◽  
Charge Imbalance

scholarly journals Further investigations into the effect of charge imbalance on luminescence production

2021 ◽  
pp. 118223
Author(s):  
M. Autzen ◽  
A.S. Murray ◽  
M. Jain ◽  
J.-P. Buylaert
Keyword(s):  
Charge Imbalance

scholarly journals Research on Molecular Structure and Electronic Properties of Ln3+ (Ce3+, Tb3+, Pr3+)/Li+ and Eu2+ Co-Doped Sr2Si5N8 via DFT Calculation

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 1849
Author(s):  
Ziqian Yin ◽  
Meijuan Li ◽  
Jianwen Zhang ◽  
Qiang Shen
Keyword(s):  
Molecular Structure ◽  
Energy Level ◽  
Density Functional ◽  
Formation Energy ◽  
Electronic Band Structure ◽  
Blue Shift ◽  
Lanthanide Ions ◽  
Partial Replacement ◽  
Electronic Band ◽  
Charge Imbalance

We use density functional theory (DFT) to study the molecular structure and electronic band structure of Sr2Si5N8:Eu2+ doped with trivalent lanthanides (Ln3+ = Ce3+, Tb3+, Pr3+). Li+ was used as a charge compensator for the charge imbalance caused by the partial replacement of Sr2+ by Ln3+. The doping of Ln lanthanide atom causes the structure of Sr2Si5N8 lattice to shrink due to the smaller atomic radius of Ln3+ and Li+ compared to Sr2+. The doped structure’s formation energy indicates that the formation energy of Li+, which is used to compensate for the charge imbalance, is the lowest when the Sr2 site is doped. Thus, a suitable Li+ doping site for double-doped lanthanide ions can be provided. In Sr2Si5N8:Eu2+, the doped Ce3+ can occupy partly the site of Sr12+ ([SrN8]), while Eu2+ accounts for Sr12+ and Sr22+ ([SrN10]). When the Pr3+ ion is selected as the dopant in Sr2Si5N8:Eu2+, Pr3+ and Eu2+ would replace Sr22+ simultaneously. In this theoretical model, the replacement of Sr2+ by Tb3+ cannot exist reasonably. For the electronic structure, the energy level of Sr2Si5N8:Eu2+/Li+ doped with Ce3+ and Pr3+ appears at the bottom of the conduction band or in the forbidden band, which reduces the energy bandgap of Sr2Si5N8. We use DFT+U to adjust the lanthanide ion 4f energy level. The adjusted 4f-CBM of CeSr1LiSr1-Sr2Si5N8 is from 2.42 to 2.85 eV. The energy range of 4f-CBM in PrSr1LiSr1-Sr2Si5N8 is 2.75–2.99 eV and its peak is 2.90 eV; the addition of Ce3+ in EuSr1CeSr1LiSr1 made the 4f energy level of Eu2+ blue shift. The addition of Pr3+ in EuSr2PrSr2LiSr1 makes part of the Eu2+ 4f energy level blue shift. Eu2+ 4f energy level in EuSr2CeSr1LiSr1 is not in the forbidden band, so Eu2+ is not used as the emission center.

scholarly journals Back and forth between Rydberg atoms and ultracold plasmas

2003 ◽  
Vol 20 (5) ◽  
pp. 1091 ◽  
Author(s):  
T. F. Gallagher ◽  
P. Pillet ◽  
M. P. Robinson ◽  
B. Laburthe-Tolra ◽  
Michael W. Noel
Keyword(s):  
Rydberg Atoms ◽  
Ultracold Plasmas

Estimating state-of-charge imbalance of batteries using force measurements

2016 ◽  
Author(s):  
Youngki Kim ◽  
Nassim A. Samad ◽  
Ki-Yong Oh ◽  
Jason B. Siegel ◽  
Bogdan I. Epureanu ◽  
...  
Keyword(s):  
State Of Charge ◽  
Force Measurements ◽  
Charge Imbalance
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