Eu和Dy掺杂BaAl_(12)O_(19)长余辉发光性能研究  

Luminescence Properties of Eu,Dy Doped BaAl_(12)O_(19) Long Afterglow Phosphors

作　　者：熊毅[1] 王银海[1] 胡正发[1] 李亚[1] 彭铁球[1] 赵慧[1] 

机构地区：[1]广东工业大学物理与光电工程学院,广东广州510006

出　　处：《光谱学与光谱分析》2012年第3期614-618,共5页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(20871033)资助

摘　　要：采用高温固相法在不同的气氛条件下合成了BaAl12O19:Eu2+/Eu3+,Dy3+发光材料。X射线衍射(XRD)表明:实验得到了纯净的BaAl12O19相结构,Eu和Dy的掺入并未改变相结构。通过比较发现,Eu和Dy掺杂后导致XRD衍射峰向高角度有微小移动,显示Eu和Dy取代晶格中Ba后使面间距发生变化。发射光谱表明:在不同条件下合成的样品都存在Eu2+的4f65d1→4f7之间的宽带跃迁;空气气氛下合成的样品中Eu2+的宽带跃迁的存在表明样品中发生了自还原现象。Dy3+的加入使样品发光增强,同时样品具备了长余辉特性。还原气氛下合成的Eu和Dy共掺样品的余辉衰减和热释光研究表明所得样品具有良好的室温和高温长余辉性能。Long afterglow phosphors BaAl12O19∶Eu2＋/Eu3＋,Dy3＋ were synthesized by high temperature solid state method under different atmosphere.X-ray powder diffraction（XRD） shows that pure BaAl12O19 phase structure was obtained and the doping ions Eu2＋/Eu3＋,Dy3＋ didn＇t change the phase structure.By comparison,the authors found that the doping ions Eu2＋/Eu3＋,Dy3＋ caused the XRD diffraction peaks moving to the high angle slightly which displayed that the inter-planar crystal spacing was changed via Eu and Dy replacing Ba lattice in BaAl12O19.Emission spectra show that all the samples prepared under different conditions exhibit the 4f65d1→4f7 broadband transition which is the features emission of Eu2＋ and the existence of the features emission of Eu2＋ in the sample synthesized in air indicates that Eu3＋ ions can be reduced to divalent state in air.The doping ions Dy3＋ can not only enhance the luminous intensity of samples but also make the samples to obtain long afterglow characteristics.The afterglow decay and thermoluminescence studies of the Eu,Dy co-doped sample synthesized under reducing atmosphere reveal that the sample has good long afterglow properties at room temperature and high temperature.

关 键 词：BaAl12O19 稀土掺杂 热释光 长余辉 

分 类 号：O33[理学—一般力学与力学基础]