Defect aggregation in anion-excess fluorites II. Clusters containing more than two impurity atoms

Bendall, P J; Catlow, C. Richard A.; Corish, J.; Jacobs, P. W. M.

doi:10.1016/0022-4596(84)90329-3

Cited by 139 publications

(46 citation statements)

References 11 publications

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“…Initially, Catlow has predicted, from theoretical simulations, the formation of ytterbium clusters 25,26 in ytterbium doped CaF 2 that have been confirmed later with spectroscopic techniques and have shown that these clusters correspond to the luminescent centers. 27 The work presented here reports, to our knowledge, the first direct imaging of these ytterbium clusters in the Yb 3+ :CaF 2 ceramics.…”

Section: Introductionmentioning

confidence: 94%

Origin of light scattering in ytterbium doped calcium fluoride transparent ceramic for high power lasers

Lyberis

Patriarche

Gredin

et al. 2011

Journal of the European Ceramic Society

102

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Section: Introductionmentioning

confidence: 94%

Origin of light scattering in ytterbium doped calcium fluoride transparent ceramic for high power lasers

Lyberis

Patriarche

Gredin

et al. 2011

Journal of the European Ceramic Society

102

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“…10 In figure 3( Figure 4 shows the excitation and emission spectra of the singly doped Pr 3+ ions whose charge was compensated locally by the F ions. 7,28,29 The excitation spectrum of The excitation and emission spectra of Eu 2+ in SrF 2 crystal are shown in figure 5. The spectra clearly consist of broad excitation and emission bands centred at 332 and 416 nm, respectively.…”

Section: +mentioning

confidence: 99%

Enhanced Pr3+ photoluminescence by energy transfer in SrF2 : Eu2+, Pr3+ phosphor

et al. 2016

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Efficient energy transfer was demonstrated in the SrF2 : Eu2+, Pr3+ phosphor synthesized by the co-precipitation method. Results obtained with X-ray diffraction (XRD), scanning electron microscopy (SEM), x-ray spectroscopy (XPS), photoluminescence (PL) and decay curves proposed the UV-Vis energy transfer process. The energy transfer process between the Eu2+ and Pr3+ ions in SrF2 was investigated to evaluate the potential of the Eu2+ ion as a sensitizer for the Pr3+ ion. The results proposed that Eu2+ could be a good sensitizer for absorbing the UV photons and efficiently enhancing the Pr3+ emission intensity. The energy transfer process was effective until concentration quenching for the Pr3+ ions occurred. The concentration quenching was attributed to cross-relaxation between the Pr3+ ions.

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“…In CaF 2 : Er 3 bulk single crystals and relatively low erbium concentration (<0.10 mol%), extended X-ray-absorption fine structure [27,28], optical [29,30] and electrical [13,31] studies have shown that isolated nn, nnn and cubic Er 3 ±F À i single pairs, but also small (dimer, trimer) and large (pentamer, hexamer) clusters can coexist. In Ca 1Àx Er x F 2x thin films epitaxially grown on Si(100), we have previously shown that the number of these situations is reduced [32 to 34].…”

Section: Discussionmentioning

confidence: 99%

Electrical Study of Pr3+ Ion Environment in Ca1?xPrxF2+x Thin Films

Elfajri

Moussetad

Tardy

et al. 2000

phys. stat. sol. (a)

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The environment of Pr 3 ions and their spatial distribution in Ca 1Àx Pr x F 2x thin films epitaxially grown on silicon substrates were studied by means of complex admittance spectroscopy (CAS) and thermally stimulated depolarization (TSD) studies. Contrary to the case of bulk single crystals, these techniques reveal only one type of praseodymium-fluoride compensating ion centers in the layers, whatever x varying from 0.001 to 0.10. These centers correspond to isolated substituted Pr 3 ions compensated by interstitial F À i ions in nearest-neighbor (nn) sites of C 4v symmetry. Moreover, it is demonstrated that for these praseodymium concentrations, the F À i ions can be transferred between two neighboring centers. The corresponding dipolar characteristics show that the nn pairs are homogeneously distributed into the bulk of the layers. These results are of great interest. They indicate that energy transfers between excited rare-earth ions, which arise in bulk single crystals for high concentrations, must be considerably reduced in thin films. Consequently the selfquenching phenomena, which rapidly annihilate the luminescence, must be minimized.

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Defect aggregation in anion-excess fluorites II. Clusters containing more than two impurity atoms

Cited by 139 publications

References 11 publications

Origin of light scattering in ytterbium doped calcium fluoride transparent ceramic for high power lasers

Origin of light scattering in ytterbium doped calcium fluoride transparent ceramic for high power lasers

Enhanced Pr3+ photoluminescence by energy transfer in SrF2 : Eu2+, Pr3+ phosphor

Electrical Study of Pr3+ Ion Environment in Ca1?xPrxF2+x Thin Films

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