中文摘要：

采用简单的水热反应合成了新型棒状、棒束状和针状花型的四方相LaVO4：Dy3＋晶体,用X粉末衍射（XRD）、扫描电镜（SEM）和荧光光谱（PL）分别测试了水热产品的物相结构、颗粒形貌和荧光性能.实验结果表明,前驱体浓度和反应温度对不同形貌LaVO4：Dy3＋晶体的形成起到了关键作用。花状LaVO4：Dy3＋晶体比棒状和棒束状样品具有更好的蓝黄比（B/Y）,同时阐述了LaVO4：Dy3＋同质异形体的形成机制.

英文摘要：

Tetragonal LaVO4：Dy3＋ with novel morphologies of rod,rod bundles and needle flower were successfully synthesized via a facile and surfactant-free hydrothermal process.The as-prepared samples were characterized by using X-ray diffraction（XRD）,scanning electron microscopy（SEM）,and photoluminescence spectroscopy（PL）.The experimental results showed that the concentration of the precursor and the reaction temperature played important roles in morphological evolution of LaVO4：Dy3＋nanocrystals （NCs）.Moreover,flower-like LaVO4：Dy3＋exhibited a higher B/Y value compared with nanorod and rod bundle LaVO4：Dy3＋.Possible growth mechanisms of polymorphological LaVO4：Dy3＋nanostructures were briefly discussed.