形貌可控的NaMgF3∶Gd3+纳米晶体的合成及其光致发光特性研究

Shape-Controlled Synthesis of NaMgF3∶Gd3+ Nanocrystals and Its Upconversion Photoluminescence Properties

采用改良型溶剂热法,成功制备出稀土离子Yb^3+, Er^3+共掺的NaMgF3∶Gd^3+纳米颗粒。通过XRD确定了所制备样品的结构,同时运用谢乐公式计算了样品的平均粒径证明样品粒径均在纳米范围之内。进一步实验结果表明,随着反应物中掺杂离子Gd^3+浓度的改变,纳米颗粒的形貌随之出现从纳米片到纳米线的转换,以此实现对纳米晶体形貌的调控。同时对所制备纳米颗粒在980 nm激发光照射下的光致发光特性进行详细的研究,值得注意的是纳米颗粒的发光强度随Gd3+掺杂浓度的变化而逐渐增强,且发生了绿光向红光逐渐转移的趋势。可控的纳米颗粒形貌以及较高的发光强度对于生物医学检测的应用是十分有益的。

In this study, rare earth ions Yb3+ and Er3+ co-doped into NaMgF3∶Gd3+ nanoparticles were successfully prepared by modified solvothermal method. The structure of the prepared sample was determined by X-Ray Diffraction, and the average particle size was calculated by using the Debye-Scherrer formula. The particle size of the sample was within the nanometer range. The results of further experiments show that with the change of the concentration of Gd3+ in the reactants, the morphology of the nanoparticles appears to change from nanosheets to nanowires, so as to realize the regulation of nanocrystals. At the same time, the photoluminescence properties of the prepared nanoparticles under 980 nm excitation light were studied in detail. It is worth noting that the emission intensity of nanoparticles gradually increases with the change of Gd3+ doping concentration, and the tendency of green to red emission occurs.