Improved moisture resistance of SrSO₄:Sm³⁺ phosphors coated with SiO₂

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• 作者：Jiayue Sun ; ^{jiayue_sun@126.com} ; Randi Sun ; Haiyan Du
• 关键词：Surfaces ; Phosphors ; SrSO4 ; Sm3+
• 刊名：Applied Surface Science
• 出版年：2012
• 期刊代码：6_01694332
• 类别：ms
• 出版时间：1 March, 2012
• 卷：258
• 期：10
• 页码：4569-4573
• 文件大小：444 K

摘要

SrSO₄:Sm³⁺ phosphors obtained by precipitation method are coated with SiO₂ and their photoluminescence (PL) degradation behavior is investigated. The SiO₂ coating is obtained by the ultrasonic sonochemical process using tetraethylorthosilicate (TEOS) as silicon coating reagent and the coating content is varied from 0.5 to 2 wt%. Powder X-ray diffraction (XRD) patterns, scanning electron microscopy (SEM), fluorescence spectrometer, and Fourier transform infrared spectrometer are employed to characterize the coating. Moisture resistances of coated SrSO₄:Sm³⁺ phosphors have been enhanced to a great degree without more loss of their optical properties based on the existence of the SiO₂ thin layer. The PL intensity of the coated phosphors decreases to 鈭?3%of the original value after 38 h soaking the phosphors in deionized water, while the uncoated phosphor decreases to 鈭?0%.