Oxygen defects in BaFBr and BaFCl

Eachus, R. S.; Nuttall, R. H.; Olm, M. T.; McDugle, W G; Koschnick, F. K.; Hangleiter, Th.; Spaeth, J.‐M.

doi:10.1103/physrevb.52.3941

Cited by 45 publications

(32 citation statements)

References 34 publications

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“…Generally speaking, the basic oxygen centers O Ϫ (F Ϫ ), O Ϫ (Cl Ϫ ), and O 2 Ϫ (Cl Ϫ ) in BaFCl are well understood. 7,10 Our results agree with the published ones as regards these systems. The situation is different for SrFCl where very few published results exist ͑see, however, Ref.…”

Section: X-radiation Damage and Oxygen Centers In Mefclsupporting

confidence: 82%

Light-induced valence-state switching in BaFCl:La and SrFCl:La

Matsarski¹,

Lovy²,

Bill³

et al. 2003

Phys. Rev. B

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A tetragonal La 2ϩ center ͑symmetry C 4v ) was identified in single crystals of BaFCl and SrFCl doped with lanthanum with the aid of electron paramagnetic resonance ͑EPR͒/electron-nuclear double resonance ͑EN-DOR͒. This center forms a donor-acceptor couple with initially present F(F Ϫ ) centers. Switching takes place by illumination of appropriate wavelength. The kinetics of the process was monitored by EPR as La 2ϩ and the unswitched F center are paramagnetic. The results of our experimental investigation of this kinetics are presented. A foregoing spectroscopic characterization of the La 2ϩ center allowed one to identify a d-d ͑the B 1 -E) transition, a charge-transfer band ͑for BaFCl at 10 940 cm Ϫ1 and at 17 890 cm Ϫ1 , respectively͒ and to obtain a value of 710 cm Ϫ1 for the spin-orbit coupling constant in the ground state. In order to narrow the choice of possible acceptor-donor partners a detailed EPR/optical search was further done to identify a number of lattice defects and oxygen centers-in addition to a La-oxygen molecular structure.

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Section: X-radiation Damage and Oxygen Centers In Mefclsupporting

confidence: 82%

Light-induced valence-state switching in BaFCl:La and SrFCl:La

Matsarski¹,

Lovy²,

Bill³

et al. 2003

Phys. Rev. B

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“…This appearance of PL and PSL is thereby attributed first to the incorporation of Eu 2þ into the BaFBr lattice, and second to the inclusion of O 2À ions needed to form F þ -centers as electron storage centers as confirmed earlier by electron paramagnetic resonance (EPR) measurements (Eachus et al, 1995). Chemically one observes at temperatures above 500 C a CO, H 2 O and a relatively weak CO 2 emission in the mass spectra as can be seen from Fig.…”

Section: Synthesis Of the Storage Phosphormentioning

confidence: 59%

New synthesis of high-quality storage phosphors

Seggern¹,

Hesse²,

Zimmermann³

et al. 2010

Radiation Measurements

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“…Very careful avoidance of oxygen could only reduce the oxygen contamination [37,38]. Oxygen can be incorporated in many ways: It was found by EPR and ENDOR investigations as O 2--in the fluorine (O 2À F ) [39] as well as in the bromine sublattice (O 2À Br ) [40,41]. There was also a molecular oxygen centre ((O F -O Br ) 3--) observed where one oxygen is placed on a fluorine site and the other one on a neighbouring bromine site [41].…”

Section: Generation Of Hole Trap Centresmentioning

confidence: 99%

Physics and Current Understanding of X-Ray Storage Phosphors

Schweizer

2001

phys. stat. sol. (a)

159

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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Oxygen defects in BaFBr and BaFCl

Cited by 45 publications

References 34 publications

Light-induced valence-state switching in BaFCl:La and SrFCl:La

Light-induced valence-state switching in BaFCl:La and SrFCl:La

New synthesis of high-quality storage phosphors

Physics and Current Understanding of X-Ray Storage Phosphors

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