形貌可控的LaPO_4:Eu^(3+)荧光粉的制备与发光性能研究  

Shape-Controlled Synthesis of LaPO_4:Eu^(3+) Phosphor and Their Luminescent Properties

作　　者：毕会芳[1] 李霞[1] 

机构地区：[1]青岛科技大学材料科学与工程学院,山东青岛266042

出　　处：《中国稀土学报》2011年第6期699-703,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金资助项目(51072086;507925205;50872070;50772051)

摘　　要：分别以硝酸镧、多聚磷酸和磷酸二氢钠为原料,在无任何添加剂和模板的条件下,采用水热法分别合成微纳米球和纳米棒两种形貌的磷酸镧。通过场发射-扫描电子显微镜(FE-SEM),X射线衍射(XRD),红外光谱(FTIR)和荧光光谱(PL)等测试手段对以上不同形貌的样品的相结构以及微观形貌进行表征。FE-SEM测试结果表明:当以多聚磷酸为磷源时,在酸性条件下可以得到平均粒径约为2μm左右的磷酸镧微球;而当以磷酸二氢钠磷源时,在酸性条件下则可以得到纳米棒;两者的分散性良好。XRD测试结果表明:两种不同形貌的样品均为单斜晶系结构。荧光光谱分析可知:Eu3+的掺杂浓度相同时,球状样品的发光强度远大于棒状样品。The lanthanide phosphate micro-nano spheres and nanorodes were synthesized by a simple hydrothermal method using lanthanum nitrate, polyphosphoric acid, and sodium dihydrogen phosphate as raw materials. The phase-composition and microstructure of as-prepared products were characterized by field-emission scanning electron microscopy （FE-SEM）, X-ray diffraction （XRD）, Fourier transform infrared spectrum （FTIR） and fluorescence spectra. The XRD analysis showed that both samples were crystals in monoclinic crystalline form. The FE-SEM characterization showed that the microstructure of samples were dependent on the pH and phosphate source of precursor. The mono disperse micro-nano spheres were obtained at pH = 1 and using phosphoric acid as raw material. However, nanorodes with a diameter about decades of nanometers were synthesized using sodium dihydrogen phosphate as raw material. The photoluminescence spectra showed that the luminescence intensity of micro-nano spheres was greater than that of the nanorodes with the same molar Eu3＋ doping.

关 键 词：磷酸镧 水热合成法 发光材料 微纳米球 纳米棒 稀土 

分 类 号：O614.33[理学—无机化学]