水热-均匀沉淀法制备亚微米长余辉发光材料SrAl_2O_4∶Eu,Dy  

Synthesis of submicron long-lasting phosphor SrAl_2O_4∶Eu,Dy by hydrothermal-homogeneous precipitation method

作　　者：李毅东[1] 朱勇[1] 陈小博[1] 刘应亮[1] 

机构地区：[1]暨南大学化学系纳米化学研究所,广东广州510632

出　　处：《功能材料》2010年第2期327-330,共4页Journal of Functional Materials

基　　金：广东省自然科学基金资助项目(0520055;7005918);中北大学校基金的大力资助

摘　　要：采用水热-均匀沉淀法,以尿素为沉淀剂,在聚四氟乙烯低温反应釜中160℃水热,在较低的煅烧温度下制备了亚微米级长余辉发光材料Sr0.97Al2O4∶Eu0.01,Dy0.02。XRD结果表明,在1000℃煅烧4h能得到单相的SrAl2O4∶Eu,Dy,SEM测试显示SrAl2O4∶Eu2+,Dy3+发光材料为球状形貌,粒径大小约为200～500nm,激发和发射光谱结果表明,随着煅烧温度升高,SrAl2O4∶Eu2+,Dy3+的发光强度也随之增强,其激发光谱峰值位于360nm,发射光谱峰值位于513nm,SrAl2O4∶Eu2+,Dy3+在1100℃煅烧后的余辉衰减时间比1000℃煅烧后显著提高,其热释光谱峰值在80～90℃。Green long-lasting phosphors SrAl2O4∶Eu^2＋,Dy^3＋ were synthesized by hydrothermal-homogeneous precipitation method.X-ray diffraction,emission scanning electron microscopy,photoluminescence,as well as thermo-stimulated luminescence were utilized to characterize the long-lasting phosphors.XRD analysis indicated the obtained SrAl2O4∶Eu2＋,Dy3＋ annealed at 1000℃ for 4h were monoclinic crystal phase.With the temperature increasing,their crystallinity would also enhanced.The obtained phosphors consist of well dispersed submicron spherical particles with a narrow size distribution of 200-500nm,and these phosphor particles show blue-purple emission corresponding to 5d-4f（513nm） of Eu^2＋ under the excitation of ultraviolet（360nm）.

关 键 词：水热-均匀沉淀法 SrAl2O4:Eu^2+ DY^3+ 长余辉 荧光粉 

分 类 号：O614.33[理学—无机化学]