Crystal-field analysis of triply ionized rare earth ions in lanthanum trifluoride

Morrison, Clyde A.; Leavitt, Richard P.

doi:10.1063/1.438641

Cited by 198 publications

(76 citation statements)

References 28 publications

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“…These components are then corrected for shielding and scaling factors that account for the expansion of the radial part of the 4f free-ion wave function of the rare earth ion immersed in the nitride lattice. These correction terms described in the earlier work of Morrison et al 35 lead to a set of crystal-field splitting parameters, B nm , that become a starting set for modeling the crystal field splitting of the 2S+1 L J multiplet manifolds reported in Tables I and II. The B nm parameters appear in a crystal-field Hamiltonian that is expressed as…”

Section: Crystal-field Splitting Calculationsmentioning

confidence: 99%

Crystal field analysis ofPm3+(4f4)andSm3

et al. 2006

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We report a detailed crystal field analysis of Pm 3+ and Sm 3+ as well as lattice location studies of 147 Pm and 147 Nd in 2H-aluminum nitride ͑w-AlN͒. The isotopes of mass 147 were produced by nuclear fission and implanted at an energy of 60 keV. The decay chain of interest in this work is 147 Nd→ 147 Pm→ 147 Sm ͑stable͒. Lattice location studies applying the emission channeling technique were carried out using the ␤ − particles and conversion electrons emitted in the radioactive decay of 147 Nd→ 147 Pm. The samples were investigated as implanted, and also they were investigated after annealing to temperatures of 873 K as well as 1373 K. The main fraction of about 60% of both 147 Pm as well as 147 Nd atoms was located on substitutional Al sites in the AlN lattice; the remainder of the ions were located randomly within the AlN lattice. Following radioactive decay of 147 Nd, the cathodoluminescence spectra of Pm 3+ and Sm 3+ were obtained between 500 nm and 1050 nm at sample temperatures between 12 K and 300 K. High-resolution emission spectra, representing intra-4f electron transitions, were analyzed to establish the crystal-field splitting of the energy levels of Sm 3+ ͑4f 5 ͒ and Pm 3+ ͑4f 4 ͒ in cationic sites having C 3v symmetry in the AlN lattice. Using crystal-field splitting models, we obtained a rms deviation of 6 cm −1 between 31 calculated-to-experimental energy ͑Stark͒ levels for Sm 3+ in AlN. The results are similar to those reported for Sm 3+ implanted into GaN. Using a set of crystal-field splitting parameters B nm , for Pm 3+ derived from the present Sm 3+ analysis, we calculated the splitting for the 5 F 1 , 5 I 4 , and 5 I 5 multiplet manifolds in Pm 3+ and obtained good agreement between the calculated and the experimental Stark levels. Temperature-dependent lifetime measurements are also reported for the emitting levels 4 F 5/2 ͑Sm 3+ ͒ and 5 F 1 ͑Pm 3+ ͒.

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Section: Crystal-field Splitting Calculationsmentioning

confidence: 99%

Crystal field analysis ofPm3+(4f4)andSm3

et al. 2006

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“…If the local symmetry of an impurity center is S 4 (as it is the case of the YLF crystal), only the following crystal field parameters are not equal to zero: B 18) For the determination of the numerical values of the crystal field parameters we have used ''smoothed crystal field parameters'' approach described in. 19,20) A point charge model of the form…”

Section: Energy States Of a Free Dy 3þ Ionmentioning

confidence: 99%

Energy Level Structure of LiYF<SUB>4</SUB>:Dy<SUP>3+</SUP>: Crystal Field Analysis

et al. 2004

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Crystal field analysis of the energy level structure of lithium yttrium fluoride doped with trivalent dysprosium was performed. Assignment of absorption lines in experimental spectrum of absorption was made in a wide spectral region: from IR to UV. Crystal field parameters for the whole series of trivalent rare earth ions in LiYF 4 crystal were obtained. The values of the intermediately coupled Lande g-factor were calculated and used to estimate the EPR g-factors g k , g ? for LiYF 4 :Dy 3þ .

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“…The similar sensitivity for low-symmetry complexes in the point-charge model was mentioned in [13]. In [7] also an essential distinction was pointed out between lattice sums in the C F parameters calculated by using X-ray data on the LaF, crystal structure of different authors.…”

Section: Local Structure Of the Nd3+ Activator Centre In The Ya109 Simentioning

confidence: 92%

Theory of Luminescence Anisotropy of YAlO₃:Nd³⁺ Single Crystals

Aminov¹,

Kaminskiĭ²,

Chertanov³

1985

Physica Status Solidi (b)

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Based on the microscopic model of activator centres in crystals theoretical calculations of the anisotropic intensity of luminescent radiation of Nd3+ ions in the YAlO, single crystals are carried out. The parameters of the effective electric-dipole moment operator of Nd3+ ions describing the probahilities of the transitions in 4F3/z + 41~/2-15/2 channels are obtained and the interference of two basic electric-dipole transition mechanisms are taken into account. I n one of these mechanisms electric-dipole transitions are allowed due to the mixing of opposite parity states to the ground 4fN-configuration of the lanthanide ions by the odd terms of the crystal field, in the another one the f-f transitions are induced by variable components of the even crystal field modulated by the radiation field. The obtained anisotropy of the luminescent inter-manifold branching ratios and calculated lifetime of the 4F3/2 state of Nd3+ ions well agree with experimental situation. Using as an example the results obtained in this work, the question of the applicability of the present model for the analysis of the spectral properties of anisotropic crystals doped with Ln3+ ions, is discussed.

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Crystal-field analysis of triply ionized rare earth ions in lanthanum trifluoride

Cited by 198 publications

References 28 publications

Crystal field analysis ofPm3+(4f4)andSm3

Crystal field analysis ofPm3+(4f4)andSm3

Energy Level Structure of LiYF<SUB>4</SUB>:Dy<SUP>3+</SUP>: Crystal Field Analysis

Theory of Luminescence Anisotropy of YAlO₃:Nd³⁺ Single Crystals

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Crystal-field analysis of triply ionized rare earth ions in lanthanum trifluoride

Cited by 198 publications

References 28 publications

Crystal field analysis ofPm3+(4f4)andSm3

Crystal field analysis ofPm3+(4f4)andSm3

Energy Level Structure of LiYF<SUB>4</SUB>:Dy<SUP>3+</SUP>: Crystal Field Analysis

Theory of Luminescence Anisotropy of YAlO3:Nd3+ Single Crystals

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Theory of Luminescence Anisotropy of YAlO₃:Nd³⁺ Single Crystals