Size-controlled nanophosphors prepared by gas-phase flame synthesis with vapor precursors

采用气相火焰合成法制备了稀土掺杂的纳米荧光粉，以气相或液体喷雾为前驱体。用透射电子显微镜、扫描电子显微镜、X射线衍射仪和荧光光谱对所制备的纳米荧光粉进行了表征。由蒸汽前驱体制备的纳米荧光粉的尺寸取决于蒸汽前驱体的分压、火焰温度和可燃气体压力。另一方面，这些荧光粉的光致发光特性只依赖于火焰温度，而火焰温度又会影响到其晶体结构。对于液体喷雾前驱体的火焰合成，其大小受喷雾液滴大小和浓度的控制。

Rare earth doped nanophosphors were prepared by a gas-phase flame synthesis method, in which some vapors or liquid sprays were used as precursors. The prepared nanophosphors were examined by TEM, SEM, XRD, and fluorescence spectroscopy. The size of nanophosphors prepared with vapor precursors depended on partial pressure of vapor precursor, flame temperature and combustible gas pressure. On the other hand, the photoluminescence characteristics of those phosphors only depend on flame temperature, which influenced on the crystalline structure. As for flame synthesis with liquid spray precursors, the size was controlled by spray droplet size and concentration.