GdPO4:Eu纳米棒束的熔盐合成及其发光性能研究

采用等摩尔硝酸钠硝酸钾作为反应介质,利用熔盐法制备了GdPO4:Eu纳米棒束。利用X射线衍射、红外光谱、扫描电子显微镜、透射电子显微镜、荧光光谱和荧光寿命等测试手段对GdPO4:Eu纳米棒束的结构、形貌和发光性能进行了研究。X射线衍射结果表明,样品在250℃开始结晶,450℃结晶完全。扫描电子显微镜和透射电子显微镜研究表明,产物主要由结晶度高的纳米棒组成的宽50～60nm,长600～1200nm的纳米棒束。发射光谱和激发光谱的研究结果表明:5D0-7FJ特征发射峰强度和激发光谱的强度随烧结温度的提高而增强,最佳掺杂浓度约为7%。     

Molten salt synthesis and luminescent properties of YVO4:Eu nanocrystalline phosphors

YVO4:Eu nanocrystalline phosphors were successfully prepared at 400 oC in equal moles of NaNO3 and KNO3 molten salts. NaOH concentration and annealing temperature played important roles in phase purity and crystallinity of the nanocrystallines, and the optimum NaOH concentration and annealing temperature were 6:40 and 400 oC, respectively. The nanocrystallines were well crystallized with a cubic morphology in an average grain size of 18 nm. Upon excitation of the vanadate groups at 314 nm, YVO4:Eu nanocrystallines exhibited the characteristic emission of Eu3+, which indicated that there was an energy transfer from vanadate groups to Eu3+. Moreover, the influence of superficial effect, especially the dangling bonds on the structure and luminescent properties of the nanocrystallines was discussed in detail.