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Improvement of water resistance of long afterglow SrAl_2O_4: Dy, Eu phosphor by coating with SiO_2 film 被引量：7

Improvement of water resistance of long afterglow SrAl2O4: Dy, Eu phosphor by coating with SiO2 film
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摘要 The long afterglow SrAl_2O_4: Dy, Eu phosphor is liable tohydrolyze in water with deterioration of the lumin- escent property.SrAl_2O_4: Dy, Eu phosphors were therefore heated at 60-90 deg. C inTEOS sol to form a surface gel and then heat-treated at 400 deg. C toobtain SiO_2 coated phosphors. Observation by ?Transmission ElectronMicroscope (TE) and X- ray photoelectron spectroscopy (XPS) showsthat a thin silica film forms on the surface of the phosphors. Thecoating procedure can be illustrated by a four-step process and thetransparent silica film can suppress the hydrolysis process, so thatthe luminescent properties of the phosphors are unimpaired or evenbetter. The long afterglow SrAl_2O_4: Dy, Eu phosphor is liable tohydrolyze in water with deterioration of the lumin- escent property.SrAl_2O_4: Dy, Eu phosphors were therefore heated at 60-90 deg. C inTEOS sol to form a surface gel and then heat-treated at 400 deg. C toobtain SiO_2 coated phosphors. Observation by ?Transmission ElectronMicroscope (TE) and X- ray photoelectron spectroscopy (XPS) showsthat a thin silica film forms on the surface of the phosphors. Thecoating procedure can be illustrated by a four-step process and thetransparent silica film can suppress the hydrolysis process, so thatthe luminescent properties of the phosphors are unimpaired or evenbetter.
作者 ZHANG Junying, CHEN Qingming, LIN Yuanhua, and ZHANG ZhongtaiState Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University,Beijing 100084, China
出处 《Rare Metals》 SCIE EI CAS CSCD 2002年第2期152-155,共4页 稀有金属（英文版）
基金 This project is financially supported by the National Natural Science Foundation of China (No. 59872016)
关键词 PHOSPHORS COATING luminescent materials SrAl_2O_4 phosphors coating luminescent materials SrAl_2O_4
分类号 TG174.4 [金属学及工艺—金属表面处理]
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参考文献9

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Rare Metals
2002年 第2期

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