980 nm激光激发下Yb/Er共掺杂氟化物纳米晶下转换发射特性

用高温热分解法制备摩尔分数为18%的Yb和摩尔分数为2%的Er共掺杂α-NaYF₄, α-NaLuF₄,β-NaYF₄,β-NaLuF₄和LiYF₄氟化物纳米晶， 并用X射线衍射(XRD)、 透射电子显微镜（TEM）和光致发光光谱表征样品的晶体结构、 形貌和发光性能. 结果表明: 所制备的样品均为纯相； 不同的氟化物纳米晶样品尺寸均匀， 粒径为10~15 nm; 在980 nm近红外激光激发下，所制备的氟化物纳米晶在1 550 nm附近均有下转换发射， 其中β-NaLuF₄∶Yb，Er纳米晶在1 550 nm处的发射最强.

Downconversion Emission Characteristics of Yb/Er Doped Fluoride Nanocrystals under 980 nm Irradition

x(Yb)=18%，x(Er)=2% codoped α-NaYF₄, α-NaLuF₄,β-NaYF₄,β-NaLuF₄4 and LiYF₄ nanocrystals were synthesized by using high temperature thermal decomposition method. X\|ray diffraction (XRD)， transmission electron microscopy (TEM) and photoluminescence spectroscopy were used to characterize the crystal structure， morphology and luminescence properties of the samples. The results show that all as-prepared samples are pure phase. The size distribution of the as-prepared samples with a nearly spherical shape is about 10—15 nm. The as-prepared samples exhibit emission at around 1 550 nm under the excitation of 980 nm laser. Among them，β-NaLuF₄∶Yb,Er has the strongest emission at the around of 1 550 nm.