The Eu3＋-doped La2Zr207 phosphor with rod-like morphology was successfully synthesized by conventional solid state reaction and hydrothermal method. X-ray diffraction patterns, transmission electron microscopy, and photoluminescence spectra were employed to charac- terize its structure and morphology as well as luminescent properties. The results indicated that the red-emitting phosphor La2Zr207：Eu3＋ had well crystallized and belonged to the cubic structure with space group of Fd3m. The as-obtained product mainly appeared as straight nanorods with an average diameter of 47 nm and length of 50-700 nm. The pos- sible growth mechanism was also discussed. It was found that under blue excitation with a wavelength of 466 nm, the La2Zr2OT：Eu3＋ phosphor exhibited a characteristic red emission at 616 nm that was attributed to the hypersensitive 5D0--＊TF2 electric dipole transition of Eu3＋ ions. Meanwhile, it was more interesting to note that the emission of 5D1--＊TFj （J=0, 1, 2） transitions and the splitting patterns of 5D0---＋TFJ （J--l, 2, 4） transitions of Eu3＋ ions can be observed in the luminescent spectra of La2Zr207：Eu3＋. It was demonstrated that Eu3＋ preferred to occupy a low symmetry site.
以醋酸锂、硝酸亚铁和磷酸二氢铵为主要原料,柠檬酸为溶剂和碳源,采用溶胶-凝胶法在氩气保护下合成橄榄石型LiFePO_4阴极材料.为了改善电池的电化学性能,在LiFePO_4阴极材料的制备过程中添加了氟和锌离子.采用扫描电镜、X线衍射光谱和恒电流充-放电测试系统分别表征了材料的微观结构、形貌和电化学性能.结果表明,氟和锌离子的添加能影响LiFePO_4作为锂离子电池阴极材料的微结构及电化学性能.在室温下,Li Fe_(1-y)Zn_y(PO_4)_(1-x/3)F_x/C(x=y=0.01)作为阴极材料制备的电池在0.1 C的倍率下放电,首次放电容量为166.0 m Ah·g^(-1),表明氟和锌离子共掺杂的材料在高倍率电流下具有更好的电化学性能.
