One-step synthesis of Yb3 ,Er3 -codoped YF3 nanoparticles via nano-reactor and their spectral characteristic
利用“纳米反应器”一步合成YF3:Yb3 ,Er3 纳米粒子及光谱特性

Yb3 , Er3 - codoped YF3 nanoparticles were rapidly prepared via microemulsion method at room temperature, then the nanoparticles were characterized by X-ray diffraction(XRD) and Scanning electron microscopy(SEM). The XRD pattern matched well with card PDF#74-911. The SEM patterns indicated that the nanoparticles were spherical morphology with the average size about 32 nm. Downconversion spectrum and upconversion spectrum were investigated. It was found that the predominant emission peak of downconversion spectrum was located at 1544 nm. In the upconversion spectrum, the intensity of red emission was stronger than that of green. In this material, the red and green emissions were both due to two photons process . Meanwhile, upconversion mechanism and process were also analyzed.