SrAl_(12)O_(19)∶Eu^(2+),Dy^(3+)紫色荧光粉的制备及光谱特性  

Preparation and Spectral Properties of SrAl_(12)O_(19)∶Eu^(2+),Dy^(3+) Violet Fluorescent Powder

作　　者：咸德玲[1] 黄可龙[1] 李朝建[1] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083

出　　处：《发光学报》2007年第3期397-401,共5页Chinese Journal of Luminescence

基　　金：2005年中南大学大学生创新教育基金资助项目(lz0502)

摘　　要：以SrCO3和Al2O3为原料,掺杂Eu2+和Dy3+,采用高温固相法制备了SrAl12O19∶Eu2+,Dy3+紫色荧光粉。当基质中nSr∶nAl=1∶12时,改变反应温度,通过X射线衍射图谱分析晶相的转变过程。反应温度分别为1150,1200,1250℃时,改变基质中的锶铝比(nSr∶nAl=1∶6~1∶18),探讨基质组成和反应温度对荧光粉发射光谱的影响。结果发现,随着基质中Al含量的增加和反应温度的升高,发射光谱从490nm蓝移至395nm。当nSr∶nAl=1∶12,反应温度为1250℃时,荧光粉的发光强度最大。该荧光粉无长余辉现象。Strontium aluminates doped with europium and dysprosium have been attracting people＇s attention for their great stability, high quantum transformation rate and fine luminescence performance. The preparation and spectra properties of yellow-green phosphor SrAl2O4： Eu^2＋ , Dy^3＋ and blue-green phosphor Sr4Al14O25： Eu^2＋ ,Dy^3＋ are commonly researched while those of SrAl12O19： Eu^2＋ ,Dy^3＋ is rarely studied. In this paper, SrAl12O19： Eu^2＋ , Dy^3＋ violet fluorescent powder was synthesized using SrCO3 and Al2O3 as raw materials employing high temperature solid-state reaction, whose emission spectrum located at 395 nm. The crystal structure was analysised by X-ray diffraction（XRD） when nsr： nAl = 1： 12. The XRD results suggested the characteristic peaks of Sr4Al14O25 gradurally decreased while those of SrAl12O19 increased by degrees when reaction temperature rised from 1 150 ℃ to 1 250 ℃. That＇s to say, the change of reaction temperature brought about the transformation of crystal structure. The excitation and emission spectra were tested by fluo spectrophotometer. When the reaction temperature was 1 150,1 200,1 250 ℃ respectively, the ratio of Sr and Al differed from 1 ： 6 to 1 ： 18 in order to investigate the corporate effect of matrix composing and reaction temperature on spectra properties. According to the binary phase diagram of SrO and A12O3, the lower of SrO content and the higher of Al2O3 content, the higher of the reaction temperature of corresponding strontium aluminates. With the content of Al in matrix increasing and reaction temperature rising, the transformation of crystal structure might change the crystal field environment, leading to the variety of emission spectra. The emission spectra shifted from 490 nm to 395 nm. The luminescence intensity of SrAl12 O19： Eu^2＋ , Dy^3＋ got to be the strongest under the condition that nsr： nAl = 1 ： 12 and reaction temperature was 1 250 ℃. The decay curve investigation was also tested in fluorescence spect

关 键 词：SrAl12O19 EU DY 固相法 发射光谱 

分 类 号：O482.31[理学—固体物理]