Luminescence characterization of a new long afterglow phosphor of single Ti-doped Y2O2S
Luminescence characterization of a new long afterglow phosphor of single Ti-doped Y2O2S
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DOI：
10.1016/j.jlumin.2004.08.056
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发表时间：
2005-05
影响因子：
3.6
通讯作者：
Pengyue Zhang;Zhanglian Hong;Min-quan Wang;Xianping Fang;G. Qian;Zhiyu Wang
中科院分区：
文献类型：
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作者：
Pengyue Zhang;Zhanglian Hong;Min-quan Wang;Xianping Fang;G. Qian;Zhiyu Wang
采用固相反应法合成了一种新型的无稀土长余辉发光材料Y2 O2 S：Ti。在382 nm光照射下，观察到一个强而宽的发射带，其峰值位于565 nm处，这可能是施主能级上的俘获电子与受主能级上的空穴复合的结果。随着Ti掺杂浓度的增加，荧光粉的发光强度和余辉增强。此外，掺杂量为9mol%的样品具有最佳的黄色长余辉，在去除激发光后，其余辉可持续5 h以上，余辉强度可达0.32mcd/m2。
A new rare-earth free phosphor Y2O2S:Ti with long afterglow was synthesized by solid-state reaction. A strong and broad emission band, which is suggested to come from the recombination of trapped electrons in the donating level and holes in the accepting level, was observed under 382nm irradiation with a peak at 565nm. The luminescence intensity and afterglow of the phosphors are enhanced with increase of doped Ti concentration. Furthermore, the best yellow long afterglow for present materials was found in the sample with 9mol% doping Ti content, and its afterglow can last over 5h with recognizable intensity level (0.32mcd/m2) after the removal of the excitation light.