Synthesis of Long Afterglow Phosphor CaAl2Si2O8:Eu2+, Dy3+ via Sol-Gel Technique and Its Optical Properties
来源期刊：JOURNAL OF RARE EARTHS2005年第5期
论文作者：Wang Zhiyu Zhang Fuan Zhang Pengyue Qian Guodong Wang Yinhai Fan Xianping
Key words：long afterlow phosphor; sol-gel method; luminescent properties; rare earths;
Abstract: The long afterglow phosphor CaAl2Si2O8:Eu2+, Dy3+ was prepared by a sol-gel method. The sol-gel process and the structure of the phosphor were investigated by means of X-ray diffraction analysis (XRD). It is found that the single anorthite phase formed at about 1000 ℃, which is 300 ℃ lower than that required for the conventional solid state reaction. The obtained phosphor powders are easier to grind than those of solid state method and the partical size of phosphor has a relative narrow distribution of 200 to 500 nm. The photoluminescence and afterglow properties of the phosphor were also characterized. An obvious blue shift occurs in the excitation and emission spectra of phosphors obtained by sol-gel and solid state reaction methods. The change of the fluorescence spectra can be attributed to the sharp decrease of the crystalline grain size of the phosphor resulted from the sol-gel technique.
Wang Zhiyu1，Zhang Fuan2，Zhang Pengyue2，Qian Guodong2，Wang Yinhai2，Fan Xianping2
(1.State Key Laboratory of Silicon Materials, Hangzhou 310027, China;
2.Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China)
Abstract:The long afterglow phosphor CaAl2Si2O8:Eu2+, Dy3+ was prepared by a sol-gel method. The sol-gel process and the structure of the phosphor were investigated by means of X-ray diffraction analysis (XRD). It is found that the single anorthite phase formed at about 1000 ℃, which is 300 ℃ lower than that required for the conventional solid state reaction. The obtained phosphor powders are easier to grind than those of solid state method and the partical size of phosphor has a relative narrow distribution of 200 to 500 nm. The photoluminescence and afterglow properties of the phosphor were also characterized. An obvious blue shift occurs in the excitation and emission spectra of phosphors obtained by sol-gel and solid state reaction methods. The change of the fluorescence spectra can be attributed to the sharp decrease of the crystalline grain size of the phosphor resulted from the sol-gel technique.
Key words:long afterlow phosphor; sol-gel method; luminescent properties; rare earths;
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