Atomic displacement effects on the cathodoluminescence of zinc selenide implanted with ytterbium ions

1974 ◽  
Vol 337 (1608) ◽  
pp. 21-47 ◽  
Keyword(s):  
Rare Earth ◽  
Zinc Selenide ◽  
Threshold Energy ◽  
Atomic Displacement ◽  
Rare Earth Ions ◽  
Incident Electron Energy ◽  
Zinc Interstitial ◽  
Concentration Changes ◽  
Crystal Field Parameters ◽  
Resonance Transfer

The cathodoluminescence emission spectrum of Yb 3+ in zinc selenide has been observed following ion implantation. The complexity of the resulting spectrum has been interpreted in terms of several distinct trigonally distorted lattice sites. The crystal field parameters obtained in this way indicate an appreciable degree of covalency between the rare-earth ions and the lattice. It has been found that all Yb 3+ spectra in zinc selenide are damagesensitive and the resulting effects can be interpreted on the assumption that the excitation mechanism is indirect, resonance transfer between like rare-earth ions is occurring and the concentration of centres is being changed. In turn, these concentration changes are used to determine a threshold energy of 8.0 eV (≡ 199 keV for the incident electron energy) for zinc displacement and an activation energy for thermal annealing of 0.14 + 0.01 eV, tentatively assigned to zinc interstitial motion.

Theoretical Study of Energy Levels Splitting of Praseodymium-Doped Trichloride

2013 ◽  
Vol 774-776 ◽  
pp. 992-995
Author(s):  
Mei Ling Duan ◽  
Jin Hong Li ◽  
Xiao Feng Yang
Keyword(s):  
Rare Earth ◽  
Crystal Field ◽  
Ionic Radius ◽  
Theoretical Study ◽  
Energy Levels ◽  
Rare Earth Ions ◽  
Energy Matrix ◽  
Irreducible Tensor ◽  
Crystal Field Parameters ◽  
Complete Energy Matrix

A 91×91 complete energy matrix of 4f2configuration ion Pr3+in triagonal crystal fieldC3hhas been constructed based upon the combination of Racahs irreducible tensor with Slaters wavefunctions. Thus, the Stark energy levels of Pr3+in trichlorides LaCl3have been calculated. The calculation result shows that the complete energy matrix method is effective to analyze the energy levels splitting of the doped entity by rare earth ions. We also know that the consideration to the sixth-order crystal field parameters is indispensable and the ionic radius of the replaced ion will play an important role in the energy levels splitting of the doped systems.

Alternative crystal field parameters for rare-earth ions obtained from various techniques

2009 ◽  
Vol 467 (1-2) ◽  
pp. 98-105 ◽  
Author(s):  
Czesław Rudowicz ◽  
Paweł Gnutek ◽  
Monika Lewandowska ◽  
Mariusz Orłowski
Keyword(s):  
Rare Earth ◽  
Crystal Field ◽  
Rare Earth Ions ◽  
Crystal Field Parameters

Experimental and calculated atomic displacement threshold energies for binary semiconductors

1969 ◽  
Vol 310 (1502) ◽  
pp. 319-339 ◽  
Keyword(s):  
Electron Energy ◽  
Emission Band ◽  
Threshold Energy ◽  
Atomic Displacement ◽  
Incident Electron ◽  
Incident Electron Energy ◽  
Atomic Displacements ◽  
Displacement Threshold ◽  
Radiation Annealing ◽  
Threshold Energies

A theory for the production of atomic displacements in binary solids by mono-energetic electrons has been developed to yield an expression which may be numerically integrated to give the number of atomic displacements produced at a particular incident electron energy. The theory is applicable to thick samples and for incident electron energies up to the secondary displacement threshold. The variation with incident electron energy of the computed numbers of displaced primary atoms for various displacement threshold energies has been correlated with experimentally induced and determined point defect concentrations and used to give a precise value of the threshold energy for a primary atomic displacement. The atomic displacements were produced by the use of mono-energetic electrons from a 100 to 400 keV Van de Graaff accelerator. The production of point defects was observed experimentally and evaluated quantitatively by photoluminescence or cathodoluminescence techniques. Displacement of tellurium in cadmium telluride was monitored using corresponding changes in the photoluminescence intensity of the 1.13 μ m emission band. No radiation annealing was observed to take place at the electron doses used and a displacement threshold energy of 7.9 ± 0.1 eV was determined for tellurium. Displacement of sulphur in cadmium sulphide was monitored using the changes in the cathodoluminescence intensity of the 1.02 μ m emission band. In this case radiation annealing occurred to such an extent that a phenomenological theory, described here, had to be developed to correct for it. A sulphur displacement threshold energy of 9.6 ± 0.1 eV was determined. In conclusion, it should be stated that direct techniques such as photoluminescence or cathodoluminescence may be used to investigate quantitatively the production of atomic displacements in binary solids and to give a precise determination for displacement threshold energies.

scholarly journals Transferability of crystal-field parameters for rare-earth ions in Y-=SUB=-2-=/SUB=-SiO-=SUB=-5-=/SUB=- tested by Zeeman Spectroscopy -=SUP=-*-=/SUP=-

2019 ◽  
Vol 61 (5) ◽  
pp. 887
Author(s):  
N.L. Jobbitt ◽  
S.J. Patchett ◽  
Y. Alizadeh ◽  
M.F. Reid ◽  
J.-P.R. Wells ◽  
...  
Keyword(s):  
Rare Earth ◽  
Crystal Field ◽  
Point Group ◽  
Rare Earth Ions ◽  
Group Symmetry ◽  
Point Group Symmetry ◽  
Crystal Field Parameters

AbstractZeeman spectroscopy is used to demonstrate that phenomenological crystal-field parameters determined for the two C _1 point-group symmetry sites in Er^3+:Y_2SiO_5 may be transferred to other ions. The two crystallographic six-and seven-coordinate substitutional sites may be distinguished by comparing the spectra with crystal-field calculations.

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