激发波长和Eu^(2+)的掺杂量对Sr_4Al_(14)O_(25)∶Eu^(2+),Dy^(3+)发光性能的影响  

Effects of Excitation Wavelength and the Eu^(2+)-doped Content on Phosphorescence of Sr_4Al_(14)O_(25)∶Eu^(2+),Dy^(3+)

作　　者：王仁清[1] 

机构地区：[1]江西财经大学新能源技术与应用研究中心,江西南昌330013

出　　处：《发光学报》2010年第5期686-690,共5页Chinese Journal of Luminescence

基　　金：江西省教育厅科技项目(赣[2007]260);江西财经大学(0421205)资助项目

摘　　要：采用溶胶-凝胶法在低温、还原气氛下制备了长余辉发光材料Sr4Al14O25∶Eu2+,Dy3+。用X射线粉末晶衍射对其进行了物相鉴定,表明在1 200℃已经得到纯相的Sr4Al14O25产物。研究了铕和锶的比值、激发光波长对所制备的Sr4Al14O25∶Eu2+,Dy3+发光性能的影响并对其影响机理进行了探讨。样品的发光性能测试结果表明:采用溶胶-凝胶法制备长余辉发光材料Sr4Al14O25∶Eu2+,Dy3+,其灼烧温度比高温固相法灼烧温度低;激发光谱向长波方向延伸时,在488 nm处发射峰增强,在410 nm处发射峰减弱;在一定范围内发光强度随着Eu2+量的增加而增强,Eu2+的最佳掺杂量为0.007,Eu2+的掺杂量超过0.007时会发生浓度猝灭。Sol-gels have been used to prepare Sr4Al14O25∶Eu2＋,Dy3＋ under low temperature at reducing atmosphere.The XRD shows that the production prepared at 1 200 ℃ is pure phase of Sr4Al14O25.Effects of some factors such as different Eu-to-Sr ratio and excitation wavelength were studied,the impact mechanism were also discussed.The obtained results indicate that： sintering temperature of sol-gel method is lower than that of high temperature solid-phase method.The excitation spectra were shifted to the long-wavelength,the 488 nm and 410 nm emission peaks were enhanced with an optimal molar ratio of 0.007 Eu2＋.When the concentration is larger than 0.007,concentration quenching will occur

关 键 词：溶胶-凝胶法 稀土 发光 长余辉 

分 类 号：O482.31[理学—固体物理]