PbF_2:Er^(3+),Yb^(3+)荧光粉的制备和多波长响应双向转换发光机理（英文）

Preparation of PbF_2:Er^(3+),Yb^(3+) Phosphors and Multi-Wavelength Sensitive Bidirectional Conversion Luminescence Mechanism

采用高温固相法制备了PbF_2∶Er^(3+),Yb^(3+)双向转换荧光粉。通过X射线粉末衍射分析(XRD)、结构精修分析、功率-强度测试和荧光光谱分析对样品进行了表征。通过X射线衍射和精修结果分析了样品的相组成和晶胞参数的变化。荧光光谱分析表明,在紫外光(378 nm)和不同波长的红外光(808、980、1 064和1 550 nm)激发下,样品在540～550 nm范围内具有强绿光发射和在650～660 nm范围内的弱红光发射。最后,通过强度-功率测试讨论了样品在不同波长的红外光下激发的上转换发光机理,并分析了在378 nm激发的下转换发光机理。

PbF2:Er3+,Yb3+bidirectional conversion phosphors were successful prepared by the high temperature solid-state reaction method.The samples were characterized by X-ray powder diffraction(XRD),general structure analysis system structure refinement,the intensity-power test and fluorescence spectrum method.XRD and Rietveld refinement were performed to analyze the phase composition and the changes of cell parameters.The fluorescence spectra analysis showed the samples exhibited the intense green emissions in the range of 540~550 nm and weak red emission in the range of 650~660 nm when excited at ultraviolet(378 nm)and different infrared wavelengths(808,980,1 064 and 1 550 nm).Finally,luminescence mechanisms excited at different infrared wavelengths were discussed by means of the intensity-power test,and the down-conversion(DC)luminescence mechanism excited at 378 nm was analyzed.