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

Published online by Cambridge University Press:  31 January 2011

I-Cherng Chen  and
Teng-Ming Chen
I-Cherng Chen
Affiliation:
Department of Applied Chemistry, National Chiao Tung University, Hsinchu 30050, Taiwan
Teng-Ming Chen*
Affiliation:
Department of Applied Chemistry, National Chiao Tung University, Hsinchu 30050, Taiwan
*
a)Address all correspondence to this author. e-mial: tmchen@cc.nctu.edu.tw
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Abstract

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 (I0) for SAED phases was found to vary with Al/Sr ratio of the sol-gel precursor, with a maximal I0 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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Type
Articles
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Journal of Materials Research , Volume 16 , Issue 5 , May 2001 , pp. 1293 - 1300
Copyright
Copyright © Materials Research Society 2001

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