中文摘要：

在不加任何表面活性剂的条件下,通过水热法直接合成了LaPO4：Eu^（3＋）纳米棒,并采用溶胶-凝胶法在其表面修饰了一层SiO2,得到了LaPO4：Eu^（3＋）@SiO2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LaPO4。FTIR分析表明,LaPO4：Eu^（3＋）粒子与SiO2是以化学键的形式结合在一起。由TEM照片可见,所得LaPO4：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LaPO4：Eu^（3＋）@SiO2纳米棒。荧光光谱分析表明：以259nm作为激发波长,LaPO4：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^5D0→^7F1跃迁。随着SiO2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。

英文摘要：

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.