Tm^(3+)高掺杂的NaYF_(4)纳米颗粒制备与发光性能研究

Preparation of Tm^(3+)highly doped NaYF_(4)nanoparticles and its luminescence properties

为了研究Tm^(3+)高掺杂浓度下NaYF_(4)纳米颗粒的上转换发光性能,采用热分解法合成了六方相的NaYF_(4)∶Yb^(3+)/Tm^(3+)(20%/8%)纳米颗粒,并用X射线衍射对其结构进行了表征,用透射电子显微镜对其形貌和大小进行了表征.通过搭建上转换光谱测试系统,研究了在980 nm激光激发下NaYF_(4)∶Yb^(3+)/Tm^(3+)纳米颗粒的上转换发光光谱,并分析了其发光机制.通过计算475,513,650,744,805 nm处发光强度与激发光功率间的依赖关系,证明了其上转换发光过程为双光子过程.

In order to investigate the upconversion luminescence properties of highly doped NaYF_(4)nanoparticles with Tm^(3+)ions,hexagonal-phase NaYF_(4)∶Yb^(3+)/Tm^(3+)(20%/8%)nanoparticles were synthesized using a thermal decomposition method.The structural characterization was performed using X-ray diffraction(XRD),while transmission electron microscopy(TEM)was employed to characterize the morphology and size of the nanoparticles.An upconversion luminescence spectroscopy system was established to study the upconversion luminescence spectra of NaYF_(4)∶Yb^(3+)/Tm^(3+)nanoparticles under 980 nm laser excitation,and the luminescence mechanism was also analyzed.By calculating the dependence of the luminescence intensity at 475,513,650,744 nm and 805 nm on the excitation power,a two-photon process of the upconversion luminescence process was demonstrated.