Effect of host compositions on the afterglow properties of phosphorescent strontium aluminate phosphors derived from the sol-gel method

被引:47
作者
Chen, IC [1 ]
Chen, TM [1 ]
机构
[1] Natl Chiao Tung Univ, Dept Appl Chem, Hsinchu 30050, Taiwan
关键词
D O I
10.1557/JMR.2001.0181
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The effect of compositions of host precursors on the afterglow and phosphorescent decay properties of Eu2+- and Dy3+-coactivated strontium aluminates (SAED) synthesized by a sol-gel process has been investigated. A variety of strontium aluminates such as Sr3Al2O6, SrAl2O4, and SrAl12O19 have been identified in the samples prepared from starting precursors with Al/Sr ratios ranging from 1 to 12, respectively. The initial afterglow intensity (I-0) for SAED phases was found to vary with Al/Sr ratio of the sol-gel precursor, with a maximal I-0 appearing in the sample with Al/Sr of 2 in which SrAl2O4 dominated. The afterglow decay rate was found to be fastest for sample with Al/Sr ratio of 1:1 in which Sr3Al2O6 phase dominated. Moreover, the afterglow decay rates for those with Al/Sr ratio of 2:1 to 12:1, in which SrAl2O4 and SrAl12O19 dominated, were found to be slow and similar.
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页码:1293 / 1300
页数:8
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