1. Alumina encapsulated SrAl2O4:Eu2+, Dy3+ phosphors
- Author
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Renqing Wang, Quanmao Yu, Minjuan Zhong, Xingdong Lü, Wangen Shu, and Xinqiang Xiong
- Subjects
Materials science ,Micrograph ,Scanning electron microscope ,General Chemical Engineering ,technology, industry, and agriculture ,Strontium aluminate ,Mineralogy ,Phosphor ,equipment and supplies ,Fluorescence ,chemistry.chemical_compound ,chemistry ,Distilled water ,Chemical engineering ,Homogeneous ,Phosphorescence - Abstract
Alumina encapsulation on SrAl2O4: Eu2+, Dy3+ phosphors by a new type of chemical precipitation process was reported for the first time to the best of our knowledge. X-ray fluorescent measurements revealed that using glycol instead of the distilled water as the disperse medium is helpful to alumina encapsulation. Scanning electron micrographs and BET measurements showed that a dense and homogeneous off-white alumina layer was formed on the phosphor surface after encapsulation. Water resistance and heat resistance measurements showed that when the encapsulation amount reached to 5 wt.% (fed value), the encapsulated phosphors began to show good water resistance and heat resistance with little loss of persistent phosphorescence.
- Published
- 2007
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