铕掺杂氧化镧纳米荧光材料的水热合成及性能表征  

Eu^(3+) Doped La_2O_3 Nano Phosphors: Hydrothermal Synthesis and Optical Properties

作　　者：王雪娇[1] 朱琦[1] 李继光[1] 

机构地区：[1]东北大学材料与冶金学院材料各向异性与织构工程教育部重点实验室,辽宁沈阳110819

出　　处：《中国稀土学报》2013年第6期641-647,共7页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金面上项目(51172038);中央高校基本科研业务费重大科技创新项目(N110802001);中央高校基本科研业务费资助项目(N120302001);中国博士后科学基金面上项目(2012M520027);高等学校博士学科点专项科研基金(20120042120056)资助

摘　　要：以La2O3、Eu2O3和氨水等为原料,采用水热法合成了(La0.95Eu0.05)(OH)3一维纳米线前驱体,并经适当煅烧制备了(La0.95Eu0.05)2O3红色荧光粉。系统考察了反应体系pH值对产物的影响。通过X射线衍射、红外光谱、场发射扫描电镜、高分辨透射电子显微镜和差热分析、荧光光谱分析等手段对产物进行了系统表征。结果表明所得氢氧化物纳米线具有多晶构造、表面平滑且结晶良好,其长度和直径分别约为800~1000 nm和40~50 nm。该氢氧化物前驱体于800℃以上煅烧可分解为结晶良好的氧化物,且所得氧化物荧光粉在288 nm电荷转移带激发下于约630 nm处呈现鲜艳的红色荧光发射,归属于Eu3+的5D0→7F2跃迁。（ La0.95 Eu0.05 ） （ OH ） 3 nanowire precursors （ Ln = La, Eu） were prepared via hydrothermal reaction using La203, Eu203, and ammonium hydroxide as raw materials, which were then converted into oxide phosphors via proper annealing. The effects of solution pH on precursor properties were studied. The systematic characterizations of the products were achieved by the combined techniques of X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, thermo gravimetric analysis/differential scanning calorimetry, photoluminescence excitation/emission pies. The results indicated that the spectrosco- hydroxide nanowires are well crystallized, polycrystalline with smooth surface, and the lengths and diameters are 800 - 1000 nm and 40 - 50 nm, respectively. Well crystallized La2O3：Eu3＋ red phosphors were obtained by calcining the hydroxide precursors at temperatures higher than 〉 800℃. Upon UV excitation into the charge transfer band at 288 nm, the oxide phosphors showed the strongest red emission at 630 nm, arising from the ^5D0 →^7F2 forced electric dipole transition of Eu^3＋.

关 键 词：Eu掺杂La2O3 一维材料 水热合成 光致发光 

分 类 号：O482.31[理学—固体物理]