Lanthanide-doped NaYF4 ∶ Yb/Er up-conversion luminescent nanophosphors (UCNPs) have been successfully synthesized by a facile hydrothermal method in which oleic acid was used as a stabilizing agent.The phase,shape,and size of the nano-crystals were regulated by careful control of synthetic conditions,including hydrothermal temperature and time,and the amounts of reactants and solvents.As a result of optimizing experimental conditions,monodisperse,oil-dispersible β-NaYF4 ∶ Yb,Er UCNPs have been obtained,which are well suitable for biological application.The phase,morphology,microstructure and luminescent properties of UCNPs were characterized by X-ray diffraction (XRD),field emission scanning electron microscope (FESEM),transmission electron microscope (TEM),fluorescence instrument,respectively.%以油酸为稳定剂通过水热法成功合成了镧系掺杂NaYF4∶Yb/Er上转换纳米发光材料(UCNPs).通过控制合成条件,包括水热温度、时间以及反应物与溶剂的量,改变纳米晶体的晶相、形状和尺寸;优化实验条件,得到了适合生物应用的小尺寸、单分散β-NaYF4∶Yb/Er纳米发光材料;分析了其不同形貌的生长机理;并分别采用X射线粉末衍射仪(XRD)、场发射扫描电子显微镜(FESEM)、透射电子显微镜(TEM)、荧光仪等表征样品的相组成、形貌、微观结构及光学性能.
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