VUV emission of rare-earth ions doped into fluoride crystals

Makhov, V.N.; Хайдуков, Н.М.; Kirikova, N.Yu; Kirm, M.; Krupa, J.C.; Ouvarova, Tatiana; Zimmerer, G.

doi:10.1016/s0022-2313(99)00507-4

Cited by 33 publications

(25 citation statements)

References 3 publications

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“…It is worth noting that the high-energy part of (Ln= Er, Nd, Pr) are not efficiently excited in the host absorption energy range. This is quite consistent with earlier studies of d-f emission in LiYF 4 :Er crystals [29]. Low-energy slope of the PLE band is represented by rapidly falling curve that corresponds to the energy threshold for the 4f -5d transitions in BLO:Pr crystal at T = 80 K (E fd = 4.5 eV or 275 nm).…”

Section: Prsupporting

confidence: 92%

Ultraviolet-visible spectroscopic characterization of lanthanum beryllate crystals doped with Er, Nd, or Pr ions

Пустоваров

Огородников

2016

J. Synch. Investig.

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Abstract-Spectroscopic characterization of lanthanum beryllate La2Be2O5 (BLO) single crystals doped with trivalent ions of Er, Nd or Pr, was carried out in the ultraviolet-visible spectral range using synchrotron radiation spectroscopy in combination with conventional optical absorption and luminescence spectroscopy techniques. On the basis of the obtained data, the energy level diagram for these trivalent impurity ions in BLO host lattice was developed; the optical and electronic properties of the crystals were determined; the possibility of the 4f -4f , 4f -5d and charge transfer transitions was analyzed; spectroscopic properties of the lattice defects formed during the introduction of trivalent impurity ions in the BLO host lattice, were investigated. We found that the lattice defects are responsible for a wide-band photoluminescence (PL) in the energy region of 400-600 nm. The most efficient excitation of the defect photoluminescence in the energy gap of BLO occurs in broad PL excitation-bands at 270 and 240 nm. The PL intensity of defects depends on the type of impurity ion and increases in the sequence: Pr-Nd-Er.

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Section: Prsupporting

confidence: 92%

Ultraviolet-visible spectroscopic characterization of lanthanum beryllate crystals doped with Er, Nd, or Pr ions

Пустоваров

Огородников

2016

J. Synch. Investig.

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“…For instance, the spectral range and the high intensity of the 5d → 4f broad emission bands are interesting in phosphors, scintillators, and solid-state laser materials, [1][2][3][4] and the relative energies of the lowest states of the 4f n−1 5d 1 configurations and the highest of the 4f n configurations are relevant for the photon cascade emission of these systems, which is interesting for environmentally safe, Hg-free, shortwavelength Xe-discharge-based fluorescence lamps. 5 As examples of fundamental interest, accurate locations of the 4f n−1 5d 1 energy levels are essential for detailed calculations of intensities in processes where they act as intermediate states, such as electronic Raman scattering, 4 which are usually treated under energy-level baricenter approximations.…”

Section: Introductionmentioning

confidence: 99%

Quantum chemical study of 4f→5d excitations of trivalent lanthanide ions doped in the cubic elpasolite Cs2NaYCl6. Ce3+ to Tb3+

Ruipérez

Barandiarán

Seijo

2005

The Journal of Chemical Physics

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Wave-function-based ab initio calculations on the lowest states of the 4f n ,4f n−1 5d͑t 2g ͒ 1 , and 4f n−1 5d͑e g ͒ 1 configurations of ͑LnCl 6 ͒ 3− clusters ͑Ln= Ce to Tb͒ embedded in the cubic elpasolite Cs 2 NaYCl 6 have been performed, in an attempt to contribute to a comprehensive understanding of the 4f → 5d excitations of lanthanide ions in crystals. Reliable data are provided on the changes of bond lengths and breathing mode vibrational frequencies upon 4f → 5d͑t 2g ͒ and 4f → 5d͑e g ͒ excitations, as well as on minimum-to-minimum and vertical absorption and emission transitions, and on the Stokes shifts. The available experimental data are discussed and predictions are made. The stabilization of the 4f → 5d͑baricenter͒ excitation of the doped ions with respect to the 4f → 5d excitations of the free ions, which is a key variable for the understanding of these excitations in solid hosts, is analyzed and found to be due, in two-thirds, to dynamic ligand correlation effects and, in one-third, to orbital relaxation, charge transfer, and covalency effects present in a mean-field approximation.

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“…The interest in new solid state materials able to produce laser emission or very intense fluorescence in the ultra violet ͑UV͒/vacuum UV spectral regions, [1][2][3][4][5] act as quantum cutters, [6][7][8] or emit upconverted light, [9][10][11] has resulted in an increase in the number of spectroscopic studies involving 4 f nϪ1 5d 1 electronic states of lanthanide ion impurities in crystals. Also, the idea that the 5 f nϪ1 6d 1 manifolds of the actinide series could have analogous value and potentiality is leading new research on crystals doped with actinide ions.…”

Section: Introductionmentioning

confidence: 99%

Quantum chemical analysis of the bond lengths in fn and fn−1d1 states of Ce3+, Pr3+, Pa4+, and U4+ defects in chloride hosts

Barandiarán¹,

Seijo²

2003

The Journal of Chemical Physics

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It is widely believed that impurity-ligand bond distances in lanthanide ͑Ln͒ and actinide ͑An͒ doped crystals, are larger in the f nϪ1 d 1 energy levels than in the f n ones. This idea, which was not justified and is probably based on the fact that Ln 5d (An 6d) orbitals have a radial extent much larger than Ln 4 f (An 5 f ) orbitals, has been neither confirmed nor rejected experimentally in spite of the fact that a very large number of absorption/emission spectroscopic studies on f -element doped hosts exist, because the band shapes depend on the square of the bond length offsets between initial and final electronic states. Recent quantum chemical calculations on Ln and An impurities in fluoride and chloride cubic hosts, which considered host embedding, dynamic electron correlation, and relativistic spin-free and spin-orbit coupling effects, have shown that impurity-ligand bond distances are classified in three sets according to their configuration, with the following trend:) 1 ͔, in contradiction with the assumed expectations. In this paper we give an interpretation of this, on the basis of a constrained space orbital variation analysis of the chemical bond in states of the f n , f nϪ1 d(t 2g ) 1 , and f nϪ1 d(e g ) 1 configurations of four model systems: Cs 2 NaYCl 6 :Ce 3ϩ , Cs 2 NaYCl 6 :Pr 3ϩ , Cs 2 ZrCl 6 :Pa 4ϩ , and Cs 2 ZrCl 6 :U 4ϩ . The analysis shows that the basic difference between f n and f nϪ1 d 1 configurations regarding bond effects which are responsible for the bond distance is that, in the former, all the open-shell electrons are shielded from the ligands by the 5p (6p) filled shell and the bond length is determined by closed-shell interactions between the outermost Ln 5p 6 (An 6p 6 ) shell and the ligands, whereas in the latter one electron has crossed the 5p (6p) barrier and is much more exposed to bonding interactions with the ligands, at the same time that an internal 4 f (5 f ) hole has been created which induces ligand to Ln ͑An͒ charge transfer, all of it resulting in the shown trends.

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VUV emission of rare-earth ions doped into fluoride crystals

Cited by 33 publications

References 3 publications

Ultraviolet-visible spectroscopic characterization of lanthanum beryllate crystals doped with Er, Nd, or Pr ions

Ultraviolet-visible spectroscopic characterization of lanthanum beryllate crystals doped with Er, Nd, or Pr ions

Quantum chemical study of 4f→5d excitations of trivalent lanthanide ions doped in the cubic elpasolite Cs2NaYCl6. Ce3+ to Tb3+

Quantum chemical analysis of the bond lengths in fn and fn−1d1 states of Ce3+, Pr3+, Pa4+, and U4+ defects in chloride hosts

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