Abstract
We found a photostimulated luminescence (PSL) effect in Eu- and Ce-doped fluorozirconate glasses which were additionally doped with 5% Br − ions. Small BaBr 2 crystallites in the hexagonal phase form in the glass upon annealing at 290°C. The PSL is attributed to the 5d–4f emission of Eu 2+ or Ce 3+. The PSL excitation band peaking at 570 nm is due to radiation-induced electron trap centres which are located either in the Eu-/Ce-doped crystallites or in the glass; where exactly they are located is not yet known. Measurements of the magnetic circular dichroism of the optical absorption (MCDA) on X-irradiated Ce-doped fluorozirconate glass showed an increased paramagnetic band in the range from 300 to 700 nm and a new paramagnetic band peaking at 570 nm. Electron paramagnetic resonance detected in these MCDA bands yielded two different defect centres having resonances at g=1.90 and 1.98, respectively.
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