【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。更多还原

【Abstract】 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.更多还原