Sr/Ca比例对Sr_(3-x)Ca_xAl_2O_6:Eu^(2+),Dy^(3+)结构与发光性能的影响  

Effect of Sr/Ca Ratio on Structure and Luminescence Properties of Phosphor Sr_(3-x)Ca_xAl_2O_6:Eu^(2+),Dy^(3+)

作　　者：李亚[1] 王银海[1] 熊毅[1] 彭铁球[1] 赵慧[1] 

机构地区：[1]广东工业大学,广东广州510006

出　　处：《稀有金属材料与工程》2013年第2期349-353,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(20871033)

摘　　要：采用高温固相法合成了长余辉发光材料Sr_(3-x)Ca_xAl_2O_6:Eu^(2+),Dy^(3+)(x=0,1,2,3),研究了样品的结构、光致发光、余辉发光和热释发光性能。结果表明:所制备的样品具有相似的结构,均为立方结构的Sr3-xCaxAl2O6。Sr/Ca比例的变化并没有引起基质结构的相变,但对样品的发光性能产生了显著影响;样品的余辉衰减曲线符合双指数衰减,但不同样品的初始强度和衰减快慢不同;通过调节锶钙比的方法,可以有效调控样品光致发光的颜色和余辉衰减特性。此外,测试样品的热释光曲线发现当样品中有两种不同深度的陷阱能级时,样品的余辉强度明显减弱,这可能与电子在不同的陷阱能级的转移有关。The long persistent phosphors Sr3-xCaxAl2O6：Eu^2＋, Dy^3＋ （x=0, 1, 2, 3） were prepared by the high temperature solid state reaction. The structure, photoluminescence, afterglow and thermoluminescence properties were studied. The X-ray diffraction analyses show that all samples have a similar structure, which is cubic structure Sr3-xCaxAl2O6. Results indicate that Sr/Ca ratio has no influence on the phase structure, but luminescent properties change significantly with the Sr/Ca ratio. The initial intensity and attenuating speed of the afterglow are different in different samples. However, all decay curves conform to double exponential decay. Luminescent properties can be adjusted by Sr/Ca ratio. In addition, thermoluminescence of all samples was also recorded. It is found that the initial intensity of afterglow significantly decreased when there were two trap energies in the sample, which may be due to electron transfer between trap energies.

关 键 词：长余辉 热释光 陷阱能级 电子转移 

分 类 号：O482.31[理学—固体物理]