کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5366838 1388356 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Encapsulation of strontium aluminate phosphors to enhance water resistance and luminescence
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Encapsulation of strontium aluminate phosphors to enhance water resistance and luminescence
چکیده انگلیسی
Strontium aluminate SrAl2O4:Eu2+,Dy3+ phosphors are chemically unstable against water or even moisture. To enhance the water resistance of the phosphors, an encapsulation was performed by direct surface reactions with phosphoric acid (H3PO4). The morphology, surface structure, surface element composition, water resistance, luminescence, and photoacoustic spectrum of the phosphors before and after encapsulation were discussed. Experimental results showed that phosphors were perfectly encapsulated by amorphous layers in nanoscale and crystalline layers in microscale under different conditions. The water resistance of phosphors was greatly enhanced by the two types of layer. More importantly, the amorphous layers enhanced the luminescence of phosphors markedly. The possible mechanism for the enhancements was also proposed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 255, Issue 17, 15 June 2009, Pages 7580-7585
نویسندگان
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