电子束还原SrAl_2O_4:(Eu^(2+),Dy^(3+))长余辉材料的力致发光研究  

Mechanoluminescence of Persistent Luminescent SrAl_2O_4:(Eu^(2+),Dy^(3+)) Material Prepared by Electron Beam Reduction

作　　者：沈冬冬[1] 季振国[1] 

机构地区：[1]杭州电子科技大学电子材料与器件实验室,杭州310018

出　　处：《无机材料学报》2015年第1期93-96,共4页Journal of Inorganic Materials

基　　金：国家自然科学基金(61372025)~~

摘　　要：通过高温烧结和电子束还原法制备了SrAl2O4:(Eu2+,Dy3+)长余辉发光材料,并利用球磨获得了SrAl2O4:(Eu2+,Dy3+)长余辉发光粉。通过把发光粉与环氧树脂混合制备了含有SrAl2O4:(Eu2+,Dy3+)长余辉发光粉的夜光胶,利用丝网印刷涂敷技术及热处理在石英玻璃上涂敷了厚度为1000 nm量级的SrAl2O4:(Eu2+,Dy3+)长余辉发光膜。通过小球下落冲击法和一套自制的基于一个雪崩二极管和皮安表的测试装置研究了这种长余辉发光膜的力致发光特性。研究发现,电子束还原法制备的SrAl2O4:(Eu2+,Dy3+)长余辉发光膜具有很好的力致发光特性,具有高达1.25的信背比和很高的信噪比。力致发光强度与小球下落前的初始高度即冲击发生前小球的动能成指数关系,光谱特性及衰减特性与长余辉发光相似。上述结果表明,力致发光是小球冲击能传递给电子并引起电子进入陷阱能级然后释放引起的。Long persistent luminescent SrAl2O4： （Eu2＋, Dy3＋） was prepared by electron beam reduction. The asprepared material was mechanically ball-milled into fine powder, and the powder was mixed with wear resistant epoxy resin. Then, the epoxy resin mixed persistent luminescent was coated on quartz glass plate by screen printing with thickness of about 1000 nm. The mechanoluminescent properties of the as-persistent luminescence film was characterized by falling ball impact technique with a homemade device for measuring mechanoluminescence intensity based on a single avalanche diode and a pico-amper meter. It is found that electron beam reduced SrAl2O4： （Eu2＋, Dy3＋） shows strong mechanoluminescence with high signal/background ratio of 1.25 and high signal/noise ratio. Further study found that intensity of the mechanoluminescence produced was proportional to exponential of the initial height of the ball （i.e., the final kinetic energy of the ball before impact） before falling down, and a decay curve was similar to that of persistent photoluminescence. These results indicate that mechanoluminescence is caused by impact energy of the ball which promotes electrons into traps, and then release via normal long persistent luminescent.

关 键 词：长余辉发光 力致发光 电子束还原 

分 类 号：TQ174[化学工程—陶瓷工业]