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DF: Dielektrische Festkörper
DF 8: Spectroscopy, Scanning and Diffraction Methods
DF 8.3: Vortrag
Mittwoch, 29. März 2006, 15:30–15:50, M{\"U}L Elch
Rare-earth doped barium halide x-ray storage phosphors and scintillators — •Julia Selling and Stefan Schweizer — Department of Physics, University of Paderborn, Warburger Str. 100, D-33098 Paderborn, Germany
Rare-earth (RE) doped orthorhombic BaX2 (X = Cl, Br, I) single crystals were investigated for their properties as x-ray storage phosphors and as x-ray scintillators by means of photoluminescence (PL), photostimulated luminescence (PSL) and x-ray luminescence (XL). The investigation of the storage and read-out mechanism in these materials will help to optimise the PSL effect in Eu- or Ce-doped fluorozirconate-based glass ceramics containing PSL-active BaX2 nanoparticles which are formed upon thermal processing of the glass [1, 2]. The PSL efficiency of the single crystals is comparable to that of Eu-doped BaFBr, which is used in commercial x-ray storage phosphor screens. The scintillation efficiency of the RE-doped barium halides investigated is compared to that of CWO (CdWO4). Features like afterglow or radiation hardness have not been considered in our comparison. The influence of the anion-cation distance on the intensity ratio of the emission types is discussed.
[1] A. Edgar, J.-M. Spaeth, S. Schweizer, S. Assmann, P.J. Newman, and D.R. Macfarlane, Appl. Phys. Lett. 75 (1999) 2386.
[2] S. Schweizer, L.W. Hobbs, M. Secu, J.-M. Spaeth, A. Edgar, G.V.M. Williams, Appl. Phys. Lett. 83 (2003) 449.