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Alumina encapsulated SrAl2O4:Eu2+, Dy3+ phosphors

✍ Scribed by Xingdong Lü; Minjuan Zhong; Wangen Shu; Quanmao Yu; Xinqiang Xiong; Renqing Wang

Book ID
104088676
Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
490 KB
Volume
177
Category
Article
ISSN
0032-5910

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✦ Synopsis

Alumina encapsulation on SrAl 2 O 4 : Eu 2+ , Dy 3+ 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.

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