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Processing of Transparent Polycrystalline AlON:Ce3+ Scintillators
【文件类型】 【消费金额】2.1 【文章页数】7 【会员操作】  
【文章作者】Chen, Ching-Fong;Yang, Pin;King, Graham;Tegtmeier, Eric L.
【文章摘要】      A new polycrystalline ceramic scintillator is reported for potential use in radiation detection and medical imaging applications. The goal was to develop cerium-activated aluminum oxynitride (AlON:Ce3+) ceramics, which can be produced using ceramic processes in comparison to the high-cost, low-yield single-crystal growth technique. A phase pure AlON:Ce3+ powder with cubic symmetry was successfully synthesized at high temperature under a reducing atmosphere to convert Ce4+ to Ce3+ in the solid solution. Two different activator concentrations (0.5 and 1.0 mol%) were explored. Fully dense and transparent AlON:Ce3+ ceramics were produced by a liquid-phase-assisted pressureless sintering. The crystal field splitting around the Ce3+ activator in the AlON was comparable to the splitting induced by Br- and the Cl- ligands, which produced an emission spectrum perfectly matching the maximum quantum efficiency range of the photomultiplier tube for radiation detection. Both optical excitation and radiation ionizations in AlON:Ce3+ were demonstrated. Challenges and mechanisms related to the radioluminescence efficiency are discussed.
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【卷】99 【ISSUE】2 【ISSUEID】815B0005     【文章期份】2016    【发布日期】2016/8/11 17:03:29    点击率:0    打印    关闭
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