Storage performance of X-ray irradiated doped CsBr

Creation of storage centers in CsBr:Eu2+ needle image plates by vacuum ultraviolet radiation

“…3, curves 1 and 2͒ and the absorption spectrum of Eu 2+ in CsBr. 7 At the 6.8 eV ͑182.4 nm͒ excitation, free excitons migrate at higher distances, therefore the probability of selftrapping in the neighborhood of Eu 2+ is higher than at the 176.2 nm excitation. As a result of the trapping near the Eu 2+ center, the energy transfer from DSLE to Eu 2+ is very effective, so practically no luminescence of the DSLE and only the Eu 2+ emission could be detected ͑Fig.…”

“…It is known that the electron is trapped by a Br − vacancy forming an F-center, 6,7 whereas the nature of the hole trap is still under discussion. The assumption that it is a Eu 3+ could not be verified and it was concluded that the hole trap consists of a Eu 2+ with a hole nearby.…”

“…The assumption that it is a Eu 3+ could not be verified and it was concluded that the hole trap consists of a Eu 2+ with a hole nearby. 7 Further, it was supposed that it is an Eu 2+ -V K -complex, 8 similar to the one in BaFBr: Eu 2+ , which is necessary for the PSL storage and readout processes. 9 However, the Eu 2+ -V K aggregates in CsBr: Eu 2+ are more complex: the EPR studies provide evidence that no isolated Eu 2+ ions exist in CsBr:Eu at room temperature.…”

Optical Storage Phosphors and Materials for Ionizing Radiation

“…CsBr:Eu 2+ displays significant photostimulated luminescence after X-ray exposure (Leblans et al, 2001;Schweizer et al, 2000) and its figure-of-merit as a storage phosphor is as high as for BaFBr(I):Eu 2+ (Hackenschmied et al, 2002;Schweizer, 2001). In particular, this material can be grown in the form of needle crystals by vacuum deposition (Weidner et al, 2007), allowing an improved lateral resolution in comparison with BaFBr(I):Eu 2+ .…”

Time‐resolved luminescence of Eu 2+ ‐aggregate centers in CsBr crystals

“…2+ is a prospective storage phosphor for visualisation of X-ray images [1,2]. The peculiarity of Eu 2+ ion incorporation in the CsBr lattice is the formation of both the Eu 2+ -V Cs isolated dipole centers (IDC) that emit with the band peaked at 434 nm, and the aggregate centers (AC) in the form of nanocrystals or precipitates of CsEuBr 3 , Cs 4 EuBr 6 and EuBr 2 phases that emit with the bands peaked at 516, 490 and 409 nm [3,4].…”