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The effect of calcium substitution on the afterglow of Eu2+/Dy3+ doped Sr4Al14O25
Authors:Danuta Dacyl  Dominik Uhlich  Thomas Jüstel
Institution:(1) FB Chemieingenieurwesen, University of Applied Sciences Münster, D-48565 Steinfurt, Germany
Abstract:The effect of calcium substitution on the afterglow of tetrastrontium aluminate phosphors (Sr4Al14O25:Eu2+, Dy3+) was investigated. A series of (Sr1-xCax)O⊎nAl2O3:Eu2+(1%), Dy3+(0.5%), with variation of calcium content (x = 0 − 1), were synthesized by a high temperature solid state reaction in a reducing atmosphere. The photoluminescence, persistent luminescence (afterglow), and lumen equivalents of these materials were studied and compared. It turned out that the afterglow properties of the phosphors were strongly dependent on the Sr/Ca ratio. As the Ca content increased, a phase transition and blue shift in emission spectra were observed. MediaObjects/11532_2009_17_Fig1_HTML.jpg
Keywords:Afterglow  Tetra strontium aluminate  Europium  Dysprosium  Photoluminescence spectra  Phase transition
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