通过调节基质组份比例,研究了SrAl2xO3x+1:Eu2+,Dy3+(x=1-2)荧光粉晶体结构,发光性质及长余辉特性。选取硝酸锶和硝酸铝作为基质原材料,硼酸氨和氟化铝作为助溶剂,采用阳离子草酸盐共沉淀,湿法预先混合原材料及分步合成等方法,制备了亮度高、余辉长及良好粒径分布的系列长余辉发光材料。基于对样品X射线衍射(XRD)图谱,扫描电子显微镜(SEM)照片,激发、发射光谱及余辉衰减曲线分析,发现SrAl2xO3x+1:Eu2+,Dy3+具有良好的结晶状态;随x增加,发射光谱峰值从520 nm蓝移至470 nm;衰减到可辨认发光强度0.32 mcd/m2,余辉时间可相应地从30 h延长到60 h以上。通过分析发现表现不同余辉特性的主要原因是Eu2+在基质中具有不同浓度、不同衰减寿命的蓝、绿两种发光中心造成的,其中蓝发光中心寿命明显高于绿发光中心。

标    签 发光材料 SrAl2xO3x+1:Eu2+,Dy3+ 长余辉 发光中心 衰减速度 luminescent materials SrAl2xO3x+1:Eu2+,Dy3+ long afterglow luminescent centers decay speeds
 

By adjusting the proportion of the host composition,the crystal structure,the luminescent properties and the long afterglow characteristics of phosphor SrAl2xO3x+1:Eu2+,Dy3+(x=1-2) are studied. Selecting strontium nitrate and aluminum nitrate as raw materials of host,ammonium borate and aluminum fluoride as fluxes,and using cationic oxalic acid co-precipitation,wet mixing,stepwise synthesis etc.,a series of long-afterglow phosphors with high brightness,long duration and good particle-size distribution are prepared. Based on the analyses on the X-ray diffraction (XRD) pattern,the scanning electron microscope (SEM) micrographs,the excitation and emission spectra and the afterglow decay curve of the sample,it is found that SrAl2xO3x+1:Eu2+,Dy3+ has a good crystal structure,the emission peak shows blueshift from 520 nm to 470 nm and the afterglow time for attenuation to recognizable luminous intensity (0.32 mcd/m2) is extended from 30 h to above 60 h when x increases. The study found that the main reason of different afterglow is that there are two types of Eu2+ luminous centers (blue and green-emitting) with different concentration and different fluorescence-decay time in the host. The fluorescence lifetime of blue-emitting center is apparently longer than that of the green emitting center.

中图分类号 O482.31
 
      

所属栏目 发光材料

基金项目 国家自然科学基金(60771059)和长沙理工大学重点学科建设项目资助课题。

收稿日期 2010-3-8

修改稿日期 2010-5-3




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