(1. 桂林电子科技大学 信息材料科学与工程系，桂林 541004；
2. 广西信息材料重点实验室，桂林电子科技大学，桂林 541004)
摘 要: 采用均匀沉淀法制备铝酸锶基质长余辉发光材料。用热重分析仪(TG)、红外光谱仪(IR)、X射线衍射仪(XRD)、扫描电镜(SEM)和荧光分光光度计对前驱体沉淀产物和焙烧样品进行表征。结果表明：前驱体沉淀产物主要是SrCO3和无定形Al(OH)3。经过熔烧后，未添加硼酸的样品为单一的SrA12O4相；添加0.3 mol 硼酸的样品为SrA12O4和Sr4Al14O25相共存；添加0.8 mol硼酸的样品中，SrA12O4相消失，仅有Sr4Al14O25相存在。与不加硼酸的样品相比，添加硼酸的样品的焙烧温度降低，晶粒长大，激发光谱和发射光谱强度增强，并且发射光谱发生了蓝移，余辉强度和时间也明显增加。但是过量的硼酸加入会降低材料的发光强度。
关键字: 长余辉发光材料；均匀沉淀法；尿素；硼酸；铝酸盐
（1. Department of Information Material Science and Engineering, Guilin University of Electronic Technology,
Guilin 541004, China;
2. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology,
Guilin 541004, China）
Abstract:Strontium aluminate long persistence phosphors were prepared through homogeneous precipitation method. The precursor and calcined samples were characterized by TG, IR, XRD, SEM and spectrophoto-fluorometer. The results show that the precursor precipitate consists of SrCO3 and amorphous Al(OH)3. Only SrA12O4 phase is observed in the calcined sample without boric acid. The crystalline phases SrA12O4 and Sr4Al14O25 coexist in the sample containing 0.3 mol boric acid. With increasing boric acid amount to 0.8 mol, the single-phase Sr4Al14O25 occurs. Compared with the sample without boric acid, the samples with boric acid show that the calcining temperature decreases and the average particle size obviously increases. The intensities of exciting spectra and emitting spectra markedly enhance, the emitting spectra show blue shift, and the long-lasting time and intensity also distinctly increase. However, the excessive addition of boric acid will decrease the emission intensity of the luminescent materials.
Key words: long persistence luminescent material; homogeneous precipitation method; urea; boric acid; aluminate
