Photostimulated luminescence of BaBr 2 : Eu

Iwase, Nobuhiro; Tadaki, Shinji; Hidaka, Souichirou; Koshino, N.

doi:10.1016/0022-2313(94)90232-1

Cited by 20 publications

(9 citation statements)

References 2 publications

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“…The emission maximum is observed at wavelengths slightly shorter (401 nm) compared to the literature value [407 nm, Ref. 31] which corresponds to the material dispersed in silica, but close to the value observed by Iwase et al [29]. The excitation spectrum (Fig.…”

Section: Alkaline Earth Bromidessupporting

confidence: 82%

Luminescence of some Eu2+ activated bromides

Gahane¹,

Kokode²,

Muthal

et al. 2009

Journal of Alloys and Compounds

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Section: Alkaline Earth Bromidessupporting

confidence: 82%

Luminescence of some Eu2+ activated bromides

Gahane¹,

Kokode²,

Muthal

et al. 2009

Journal of Alloys and Compounds

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“…51. Photoluminescence spectra recorded at RT for (a) the Eu 2+ doped glass ceramic and (b) the Ce 3+ doped glass ceramic, excited at 270 nm [110] with Eu 2+ [115]. However, the emissions could also come from Eu 2+ or Ce 3+ containing Br --aggregates in the glass.…”

Section: Photoluminescence and Psl Of Fluorozirconate Glasses And Glamentioning

confidence: 99%

Physics and Current Understanding of X-Ray Storage Phosphors

Schweizer

2001

phys. stat. sol. (a)

163

108

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BaFBr doped with Eu 2+ is the most successful X-ray storage phosphor used for digital radiography so far. The mechanisms of information storage and subsequent read-out are, however, not yet fully understood. The present understanding of the structures and reactions of the radiation-induced point defects involved in these processes are critically discussed. The shortcomings of X-ray storage phosphor screens based on BaFBr : Eu 2+ are the inferior spatial resolution compared to conventional X-ray films. Also reviewed are therefore alternative storage phosphors such as alkali halides doped with Eu 2+ , Ga + , In + , or Tl + or elpasolites doped with Ce 3+ or Eu 2+ which are also promising with high figures of merit and potentially higher spatial resolution. A completely new approach is the use of suitably doped glasses and glass ceramics. First results on fluorozirconate glass ceramics with good storage and read-out properties are reviewed.

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“…Strontium bromide has been used as a vapor-phase laser . BaBr 2 single-crystals are excellent X-ray storage phosphors when doped with lanthanide ions such as Eu(II) or Ce(III) and have recently been proposed for use in X- and γ-ray scintillation applications. , By combining multiple field 79/81 Br SSNMR experiments with gauge-including projector-augmented wave (GIPAW) density functional theory (DFT) quantum chemical computations, we show that significant insight is available regarding the bromide environments in the alkaline earth metal bromides and corresponding hydrates. It will also be shown that pseudopolymorphs are easily distinguished and characterized, and that the composition of a simple mixture may be determined using 79/81 Br SSNMR experiments.…”

Section: Introductionmentioning

confidence: 99%

Solid-State ^79/81Br NMR and Gauge-Including Projector-Augmented Wave Study of Structure, Symmetry, and Hydration State in Alkaline Earth Metal Bromides

Widdifield

Bryce

2010

J. Phys. Chem. A

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Bromine-79/81 solid-state NMR (SSNMR) spectroscopy is established as a tool to characterize the local structure and symmetry about bromide ions in inorganic systems. Benchmark experimental 79/81Br SSNMR data are acquired for CaBr2, SrBr2, BaBr2, MgBr2·6H2O, SrBr2·6H2O, BaBr2·2H2O, and CaBr2·xH2O using the Solomon echo and/or QCPMG pulse sequences in magnetic fields of 11.75 and 21.1 T. Analytical line-shape analysis provides 79/81Br electric field gradient (EFG) tensor parameters (including 79Br quadrupolar coupling constants, C Q(79Br), of up to 75.1(5) MHz in CaBr2), chemical shift tensor parameters (including the largest reported anisotropy), and the relative orientation of the tensor principal axis systems. These data are interpreted in terms of structure and symmetry. Our results indicate that ionic bromide systems should be generally accessible to characterization by 79/81Br SSNMR despite sizable quadrupolar interactions. The resolving capabilities of 79/81Br SSNMR spectroscopy are illustrated, using samples which possess up to four magnetically inequivalent sites, and through a rare example of 79Br magic-angle spinning NMR for a Br in a noncubic lattice. Bromine-79/81 SSNMR spectroscopy is demonstrated to be sensitive to the presence of hydrates (i.e., pseudopolymorphism), via drastic changes in C Q and δiso. The changes are diagnostic to an extent that the composition of the mixture CaBr2·xH2O is determined for the first time. This technique should therefore be applicable to characterize other unknown mixtures or polymorphs. Important instances where 79Br nuclear quadrupole resonance data were found to be deficient are noted and corrected. GIPAW DFT computations are shown to be generally in very good agreement with the experimental 79/81Br SSNMR observations. Finally, it is demonstrated that the origin of the EFG at the Br nuclei cannot be described quantitatively using a point charge model, even after including Sternheimer antishielding effects.

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Photostimulated luminescence of BaBr 2 : Eu

Cited by 20 publications

References 2 publications

Luminescence of some Eu2+ activated bromides

Luminescence of some Eu2+ activated bromides

Physics and Current Understanding of X-Ray Storage Phosphors

Solid-State ^79/81Br NMR and Gauge-Including Projector-Augmented Wave Study of Structure, Symmetry, and Hydration State in Alkaline Earth Metal Bromides

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Photostimulated luminescence of BaBr 2 : Eu

Cited by 20 publications

References 2 publications

Luminescence of some Eu2+ activated bromides

Luminescence of some Eu2+ activated bromides

Physics and Current Understanding of X-Ray Storage Phosphors

Solid-State 79/81Br NMR and Gauge-Including Projector-Augmented Wave Study of Structure, Symmetry, and Hydration State in Alkaline Earth Metal Bromides

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Product

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About

Solid-State ^79/81Br NMR and Gauge-Including Projector-Augmented Wave Study of Structure, Symmetry, and Hydration State in Alkaline Earth Metal Bromides