Radiation defects in Ce³⁺-activated fluorobromozirconate glass-ceramic X-ray storage phosphors

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• 作者：Secu ; M. ; Schweizer ; S. ; Rogulis ; U. ; Spaeth ; J.-M. ; Edgar ; A. ; Williams ; G.V.M.
• 关键词：X-ray storage phosphor ; Fluorozirconate glass-ceramics ; Photostimulated luminescence ; Magnetic circular dichroism
• 刊名：Radiation Measurements
• 出版年：2004
• 出版时间：August - December, 2004
• 年：2004
• 卷：38
• 期：4-6
• 页码：739-742
• 全文大小：202 K

文摘

We report on a photostimulated luminescence (PSL) effect in Ce-doped fluorobromozirconate glasses. Small hexagonal or orthorhombic BaBr₂ crystallites are formed in the glass upon annealing. The PSL shows a (381,415)nm doublet which is due to the 5d–4f luminescence of Ce³⁺ in the orthorhombic BaBr₂ crystallites embedded in the glass matrix. The stimulation band of the PSL peaking at 580nm is probably due to perturbed F centres in the crystallites. After X-irradiation the magnetic circular dichroism of the optical absorption showed a broad band in the spectral range between 440 and 800nm, having a derivative-like line shape centred at about 600nm. The spectrum consists of two overlapping bands: one, derivative-like, belongs probably to F-centres, whereas the second band, superimposed on the low-energy region of the F-centre band, is due to a hole centre.