Luminescence Property Of Eu-doped Fluorochlorozirconate Glass-ceramics

Electron Trapping Materials studied before had the limited practicability because of their several shortcomings in optical storage. For the sake of better understanding to the optical properties of electron trapping materials and further improvement of their optical storage capability, properties of photo-stimulated luminescence in the BaCl₂:Eu²⁺ phosphor and Eu-doped fluorochlorozirconate glass ceramics were mainly investigated. A series of Eu²⁺-doped fluorochlorozirconate glass-ceramics and the powder of BaCl₂:Eu²⁺ were prepared by solid state reaction method.The composition of sample is analyzed by X-ray diffraction. Based on photo-luminescence, photo-stimulated luminescence (PSL), decay curves of photo-stimulated luminescence and the turbidity of fluorozirconate glass-ceramics, the optical properties of these materials were studied. It is shown from the XRD measurements that glass-ceramics small crystallites of BaCl₂ are embedded in glass matrixes of Eu²⁺-doped fluorochlorozirconate and in the BaCl₂:Eu²⁺ phosphor. The PSL in the glass ceramics more probably results from the 5d-4f transition of Eu²⁺ in the BaCl₂ crystallites.Study shows that these materials have evident photo-stimulated luminescence and can be applied to optical storage. Compared with the well-established single-crystal BaFBr:Eu²⁺, the BaCl₂:Eu²⁺ phosphor has the relatively slow decay time. The transparent fluorochlorozirconate glass-ceramics not only have the relatively slow decay time, but also have the high spatial resolution.The annealed time and the concentration of BaCl₂ of fluorochlorozirconate glass-ceramics were also investigated to find out the infection of photo-stimulated luminescence and the spatial resolution. Study shows that fluorozirconate glass-ceramics have the lower spatial resolution and the higher PSL with improved the annealed time and the improved concentration of BaCl₂ of fluorochlorozirconate glass-ceramics. The glass annealed for 50 minutes at 290℃will become opaque. when the concentration of BaCl₂ of fluorochlorozirconate glass-ceramics was up to a certain extent, the glass is no longer symmetrical.