The stark effect in luminescence spectra of alkali fluoride crystals with hexavalent uranium

Kaplyanskiǐ, A. A.; Medvedev, V. N.; Moskvin, N. A.; Gavrilov, O. D.

doi:10.1016/0022-2313(70)90104-3

Cited by 15 publications

(4 citation statements)

References 9 publications

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“…Conversely, it has been known for several decades that the optical lines of rare-earth ions in solids are sensitive to stress via the piezospectroscopic effect [31,32]. Indeed, in the elastic regime, a compressive or tensile stress modifies the interatomic distances.…”

Section: General Descriptionmentioning

confidence: 99%

Strain-mediated ion-ion interaction in rare-earth-doped solids

Louchet-Chauvet¹,

Chanelière²

2023

Preprint

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It was recently shown that the optical excitation of rare-earth ions produces a local change of the host matrix shape, attributed to a change of the rare-earth ion's electronic orbital geometry. In this work we investigate the consequences of this piezoorbital backaction and show from a macroscopic model how it yields a disregarded ion-ion interaction mediated by mechanical strain. This interaction scales as 1/r 3 , similarly to the other archetypal ion-ion interactions, namely electric and magnetic dipole-dipole interactions. We quantitatively assess and compare the magnitude of these three interactions from the angle of the instantaneous spectral diffusion mechanism, and reexamine the scientific literature in a range of rare-earth doped systems in the light of this generally underestimated contribution.

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Section: General Descriptionmentioning

confidence: 99%

Strain-mediated ion-ion interaction in rare-earth-doped solids

Louchet-Chauvet¹,

Chanelière²

2023

Preprint

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“…In the previous paper [4] we showed that the luminescence decay time of centers comprising the ion U 5+ , surrounded by oxygen ions located on the axis of symmetry C 4 jcite8,9, is on the order of 210 ns and is accompanied by photoluminescence in the green region of the spectrum. As for the anisotropic glow centers with an axis of symmetry C 2 , the models of which are considered in [10,11], the maximum of their luminescence is in the blue and green regions of the spectrum. We have not found experimental data on the kinetics of luminescence in the yellow spectral region with a maximum at 563 nm.…”

Section: Introductionmentioning

confidence: 99%

Perculiarities of yellow luminescence decay kinetics in LiF-UO-=SUB=-2-=/SUB=- crystals

L.I

N.A.

L.I.

et al. 2023

Optics and Spectroscopy

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A fast component, on the order 387 ns (300 K), has been detected in the decay kinetics of the yellow luminescence (563 nm) in LiF-UO2 crystals. It is shown that the emitting centers are anisotropic formations oriented in the crystal lattice along the second-order symmetry axes (C2) using the method of azimuthal dependence of the luminescence polarization. A model of the radiating centre is proposed and the position of the oxygen defect excited level is determined, from which the transition of an electron to the conduction band occurs. The luminescence (387 ns) from of the U5+ ion is observed as a result of electron transfer from oxygen ion to the excited U6+ level. The subsequent hole localization on U5+ in the ground state is accompanied by the reduction of the U6+ ion, that luminescence is observed in the green region of the spectrum (523 nm) with time decay 100 microsecond. Keyword: decay kinetics of luminescence, polarization, LiF-UO2 crystals.

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“…Early experiments including the uniaxial stress effect, 8 the external electric-field effect, 9 and polarization effects on electric and magnetic dipole transitions 10 have been performed on prominent optical lines appearing in the visible region of the U 6ϩ O 5 F center.…”

Section: Introductionmentioning

confidence: 99%

p-f and f-f transitions of U6+O5F and U5+O5F centers in LiF

Parrot¹,

Boulanger

Gendron³

et al. 2004

Phys. Rev. B

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An overall analysis of the energy levels of U 6ϩ O 5 F and U 5ϩ O 5 F centers of C 4v symmetry in LiF is presented. First, the experimental energies of the fine-structure lines of seven p-f transitions of the prominent (U 6ϩ O 5 F) 5ϩ center of C 4v symmetry are determined from well resolved absorption spectra in the UV range and from polarized emission and excitation experiments in the range 18 000-40 000 cm Ϫ1 . Second, a comparison with the f-f energy levels of U 5ϩ previously observed in x or ␥ irradiated UO 5 F centers shows that the energies of the p-f transitions of U 6ϩ can be approximately accounted for by shifting the energies of the f-f transitions of U 5ϩ by ⌬ϭ19 493 cm Ϫ1 , ⌬ representing the energy difference between the center of gravity of the fine-structure levels of the first excited level and the fundamental level of the configuration 5 f 0 . Finally, an analysis of the fine-structure lines associated to the p-f transitions and a comparison with the relativistic electronic structures of configurations 5 f 0 and 5 f 1 of cubic molecules UF 6 , UF 6Ϫ , and NpF 6 are made in order to determine which p and f orbitals are associated to the observed p-f transitions of U 6ϩ .

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The stark effect in luminescence spectra of alkali fluoride crystals with hexavalent uranium

Cited by 15 publications

References 9 publications

Strain-mediated ion-ion interaction in rare-earth-doped solids

Strain-mediated ion-ion interaction in rare-earth-doped solids

Perculiarities of yellow luminescence decay kinetics in LiF-UO-=SUB=-2-=/SUB=- crystals

p-f and f-f transitions of U6+O5F and U5+O5F centers in LiF

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