On the role of nonstoichiometry on the photostimulated luminescence in Ba(1−)Sr FBr:Eu

Storage efficiency of BaFBr:Eu2+ image plates irradiated by swift heavy ions

“…Powder of BaFBr with 0.1 mol% Eu 2+ was prepared by solid-state reaction method as previously reported [4]. Two different sample types were prepared: type-1 with a high concentration of Br À vacancies and type-2 of stoichiometric composition.…”

“…The nature of the electron-trap centers is understood in detail, being mainly F centers in the fluorine and bromine sublattices (F(F À ) and F(Br À )) [2]. The holes are localized close to the Eu 2+ ions, but the microstructure of the hole storage centers and processes linked to the PSL center formation are still under discussion [3,4]. In BaFBr:Eu 2+ the highest PSL signal can be achieved by photo-stimulation of the F(Br À ) color centers.…”

“…In BaFBr:Eu 2+ the highest PSL signal can be achieved by photo-stimulation of the F(Br À ) color centers. At room temperature, the absorption maxima are at a wavelength of 508 and 596 nm [4] (for samples containing a high concentration of Br À vacancies). The F(F À ) color centers in the fluorine sublattice have an absorption maxima at 370 and 512 nm, and the F A (F À , Eu 2+ ) centers absorb at 445 and 520 nm (data for 4 K) [2].…”

Optimization of Mixed Storage Phosphors of the Type (Ba,Sr)F1+xBr1−x:Eu for Digital X-Ray Radiography

“…The common way to increase the sensitivity of the BaFBr:Eu X-ray storage phosphor is the BaFBr:Eu -SrFBr:Eu (or CaFBr:Eu) solid solution preparation and the changing of the F/Br ratio in favor of F [1][2][3][4][5]. Earlier we have shown that the additional 1,92 and 2,28 eV stimulation bands arising from Sr addition are caused by FA(Br,Sr 2 +) center formation.…”

“…Earlier we have shown that the additional 1,92 and 2,28 eV stimulation bands arising from Sr addition are caused by FA(Br,Sr 2 +) center formation. One more band with maximum at nearly 1,8 eV is caused by iodine substitution [5] for the anion. Most of the mentioned publications report using NH 4 Br as a bromine source.…”