Photostimulated luminescence in BaX 2 :Eu 2+ (X=Br,Cl) X-ray storage phosphors |
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| Authors: | M. Secu R. Kalchgruber S. Schweizer J.-M. Spaeth A. Edgar |
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| Affiliation: | 1. Physics Department , University of Paderborn , Paderborn , D-33095 , Germany;2. Forschungsstelle Arch?ometrie der Heidelberger Akademie , Wissenschaften am Max-Planck-Institut für Kernphysik , Heidelberg , D-69029 , Germany;3. School of Chemical and Physical Sciences , Victoria University , Wellington , New Zealand |
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| Abstract: | The photostimulated luminescence (PSL) effect in BaX 2 :Eu 2+ (X=Br, Cl) is comparable to that observed in BaFBr:Eu 2+ which is used in commercial X-ray storage phosphor screens. After X-irradiation the PSL stimulation spectra of BaX 2 :Eu 2+ (X=Br, Cl) single crystals are identical to the F centre absorption spectra, i.e. the F centres are the PSL-active electron trap centres. The nature of the hole centres is still unknown. The PSL response time of about 0.70 v s is within experimental error of 0.02 v s identical to the Eu 2+ radiative lifetime, whereas in BaCl 2 :Eu 2+ the PSL response time is 0.60 v s, and thus longer than the Eu 2+ radiative lifetime of 0.47 v s. |
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| Keywords: | X-ray Storage Phosphor Barium Dihalides Photostimulated Luminescence |
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