LaPO_4:Eu^(3+)@SiO_2核壳结构发光纳米棒的制备与表征  

Preparation and Characterization of LaPO_4:Eu^(3+) @ SiO_2 Core-shell Luminescent Naonrods

作　　者：刘桂霞[1] 李若兰[1] 董相廷[1] 王进贤[1] 

机构地区：[1]长春理工大学化学与环境工程学院,吉林长春130022

出　　处：《发光学报》2011年第5期466-470,共5页Chinese Journal of Luminescence

基　　金：国家自然科学基金(51072026);吉林省科技发展计划(20090528)资助项目

摘　　要：在不加任何表面活性剂的条件下,通过水热法直接合成了LaPO_4:Eu^(3+)纳米棒,并采用溶胶-凝胶法在其表面修饰了一层SiO_2,得到了LaPO_4:Eu^(3+)@SiO_2纳米棒。XRD分析表明,样品包覆前后均属于单斜晶系的独居石型的LaPO_4。FTIR分析表明,LaPO_4:Eu^(3+)粒子与SiO_2是以化学键的形式结合在一起。由TEM照片可见,所得LaPO_4:Eu^(3+)样品为直径约20nm、长度达300～500nm的长径比较大的纳米棒。通过改变TEOS的加入量得到了不同包覆层厚度的LaPO_4:Eu^(3+)@SiO_2纳米棒。荧光光谱分析表明:以259nm作为激发波长,LaPO_4:Eu^(3+)发光纳米棒的主发射峰位于591nm,为Eu^(3+)的特征橙红光发射,归属于Eu^(3+)的~5D_0→~7F_1跃迁。随着SiO_2包覆层厚度的增加,样品的激发光谱和发射光谱的强度逐渐减弱,峰形和谱峰的位置没有明显的变化。LaPO_4：Eu^（3＋）luminescence nanorods were prepared via a hydrothermal method without any surfactants, then an uniform SiO_2 layer was coated on the surface of LaPO_4：Eu^（3＋）nanorods by sol-gel method.At lasts LaPO_4：Eu^（3＋）@ SiO_2 core-shell structural luminescence nanorods were achieved.XRD patterns show that the uncoated and coated samples are all monclinic LaPO_4 crystals.FTIR spectra indicate that LaPO_4：Eu^（3＋）is linked with SiO_2 by chemical bond.TEM images reveal that the LaPO_4：Eu^（3＋）samples are one-dimensional nanorods with a diameter of 20 nm and a length of 300～500 nm.The coating thickness of SiO_2 can be controlled by the concentration of TEOS.The results of photoluminescence properties show that the main emission peak of LaPO_4：Eu^（3＋）nanorods is near 591 nm,which is the characteristic orange red light corresponding to ~5D_0→~7E_1 transition of Eu^（3＋）under 259 nm excitation.The PL intensity of the samples become weak with the increasing of the coating thickness,but the shape and the position of the peaks are not changed.

关 键 词：LaPO_4:Eu^3+ 纳米棒 核壳 包覆 发光材料 

分 类 号：O482.31[理学—固体物理] O614[理学—物理]