Microscopic analysis of the crystal field strength and lowest charge transfer energies in the elpasolite crystalsCs2NaYX6(X=F,Cl,Br)doped withCr3+

2006 ◽  
Vol 74 (4) ◽  
Author(s):  
M. G. Brik ◽  
K. Ogasawara
Keyword(s):  
Charge Transfer ◽  
Field Strength ◽  
Crystal Field ◽  
Microscopic Analysis ◽  
Crystal Field Strength

scholarly journals Luminescence properties of Ce3+ and Eu2+ in fluorites and apatites

Mineralogia ◽  
2009 ◽  
Vol 40 (1-4) ◽  
pp. 85-94 ◽  
Author(s):  
Sabina Bodył
Keyword(s):  
Field Strength ◽  
Crystal Field ◽  
Luminescence Properties ◽  
Luminescence Spectra ◽  
Low Concentration ◽  
Crystal Field Strength

Luminescence properties of Ce3+ and Eu2+ in fluorites and apatitesNatural samples of fluorite and apatite from granites, pegmatites, carbonatites and andesitic tuffs were investigated by steady-time spectroscopy to characterize the luminescence properties of Ce3+ and Eu2+. The luminescence of Ce3+ has been clearly seen in fluorite as 320 and 337 or 343 nm bands. In apatites, two distinct bands for two different Ca crystal sites were obtained: 340-380 nm for Ca(1) and 420-450 nm for Ca(2). The luminescence spectra of Eu2+ in the fluorite crystals were measured even at for low concentration of this element (0.11 ppm). For Ce3+, it has been showed that the crystal field strength depends more on the nature of the ligand than on the Me-ligand distances.

Intentional modification of the optical spectral response and relative sensitivity of luminescent thermometers based on Fe3+,Cr3+,Nd3+ co-doped garnet nanocrystals by crystal field strength optimization

2020 ◽  
Vol 4 (6) ◽  
pp. 1697-1705 ◽  
Author(s):  
K. Kniec ◽  
K. Ledwa ◽  
K. Maciejewska ◽  
L. Marciniak
Keyword(s):  
Field Strength ◽  
Crystal Field ◽  
Spectral Response ◽  
Relative Sensitivity ◽  
Temperature Range ◽  
Crystal Field Strength ◽  
Co Doped

The relative sensitivity and usable temperature range of Fe3+,Cr3+-based luminescent thermometers can be tuned by modification of the crystal field strength.

Regulation of red to near-infrared emission in Mn2+ single doped magnesium zinc phosphate solid-solution phosphors by modification of the crystal field

2015 ◽  
Vol 3 (48) ◽  
pp. 12443-12449 ◽  
Author(s):  
Y. Y. Ma ◽  
J. Q. Hu ◽  
E. H. Song ◽  
S. Ye ◽  
Q. Y. Zhang
Keyword(s):  
Solid Solution ◽  
Field Strength ◽  
Crystal Field ◽  
Near Infrared ◽  
Zinc Phosphate ◽  
Local Environment ◽  
Infrared Emission ◽  
Crystal Field Strength ◽  
Near Infrared Emission

The different Mg/Zn ratios of (Mg1−xZnx)2.97(PO4)2:0.03Mn2+ result in various PL intensities and spectra profiles, which are related to the crystal field strength and local environment of the Mn2+ ions.

Theoretical Studies of the Spin Hamiltonian Parameters and Local Distortions for Cu2+ in Alkaline Earth Lead Zinc Phosphate Glasses

2016 ◽  
Vol 71 (8) ◽  
pp. 769-775 ◽  
Author(s):  
Bo-Kun Wang ◽  
Shao-Yi Wu ◽  
Zi-Yi Yuan ◽  
Zi-Xuan Liu ◽  
Shi-Xin Jiang ◽  
...  
Keyword(s):  
Field Strength ◽  
Crystal Field ◽  
Alkaline Earth ◽  
Zinc Phosphate ◽  
Phosphate Glasses ◽  
Spin Hamiltonian ◽  
Local Structures ◽  
Crystal Field Strength ◽  
Lead Zinc ◽  
Hamiltonian Parameters

AbstractThe spin Hamiltonian parameters and local structures are theoretically studied for Cu2+-doped alkaline earth lead zinc phosphate (RPPZ, R=Mg, Ca, Sr, and Ba) glasses based on the high-order perturbation calculations for a tetragonally elongated octahedral 3d9 cluster. The relative elongation ratios are found to be ρ≈3.2%, 4.4%, 4.6%, and 3.3% for R=Mg, Ca, Sr, and Ba, respectively, because of the Jahn-Teller effect. The whole decreasing crystal-field strength Dq and orbital reduction factor k from Mg to Sr are ascribed to the weakening electrostatic coulombic interactions and the increasing probability of productivity of nonbridge oxygen (and hence increasing Cu2+–O2− electron cloud admixtures) under PbO addition, respectively, with increasing alkali earth ionic radius. The anomalies (the largest Dq and the next highest k among the systems) for R=Ba are attributed to the cross linkage of this large cation in the network. The overall increasing order (Mg≤Ba<Ca<Sr) of ρ is largely due to the decreasing crystal-field strength Dq and hence the decreasing force constant of the Cu2+–O2− bonds. The present studies would be helpful to understand local structures and the influences on the optical properties of RPPZ glasses containing copper dopants.

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