CaF_2∶xYb^(3+),yEr^(3+)纳米颗粒的合成及其上转换发光性质

Synthesis and Up-conversion Luminescence Properties of CaF_2∶xYb^(3+),yEr^(3+) Nanoparticles

采用水热合成法制备了CaF2∶xYb3+,yEr3+(x=0.1~0.8,y=0.01~0.08)纳米颗粒,利用X射线粉末衍射仪、透射电子显微镜和F-4600荧光分光光度计表征了样品的物相和形貌尺寸,并探究了Yb3+和Er3+掺杂浓度对样品的上转换发光性质的影响。结果表明,所合成的样品为立方相,球形颗粒,平均直径为12 nm,敏化剂Yb3+的最佳掺杂摩尔分数为20%,而激活剂Er3+的最佳掺杂摩尔分数为6%。此时,绿光与红光的强度之比最大。

Green up-conversion luminescence material CaF2∶ xYb3 +,yEr3 +(x = 0. 1 ~ 0. 8,y = 0. 01 ~ 0. 08) nanoparticles were synthesized by the hydrothermal method. The crystal structure, morphology and up-conversion spectra of the samples were characterized using X-ray powder diffractometer,transmission electron microscope and fluorescence spectrophotometer with single-wavelength diode laser of 980 nm. The samples are cubic phase and spherical shape with an average size of 12 nm. The influence of Yb3 +and Er3 +concentration on the up-conversion luminescence of the CaF2∶ xYb3 +,yEr3 +(x =0. 1 ~0. 8,y =0. 01 ~0. 08) nanoparticles were systematically investigated and discussed. It is found that the optimum mole fraction of the sensitizer Yb3 +is 20% and the activator Er3 +is 6%. At this point,the ratio of the green and red light intensity is the largest.