NaYF_4:Yb^(3+),Er^(3+)纳米晶的溶剂热制备及光学性质研究

Solvothermal Preparation and Optical Properties of NaYF_4:Yb^(3+), Er^(3+) Nanocrystals

本文采用溶剂热法制备了Yb^(3+)和Er^(3+)共掺杂NaYF_4上转换发光材料,并对材料的结构、尺寸、形貌及上转换发光性质进行了表征。研究结果表明F-/Y^(3+)的比例对材料结构,形貌及尺寸有着重要影响,较高的F-浓度有利于六角相NaYF_4的生成。由于较小尺寸材料中表面吸附大声子振动基团的增加,增加了~4I_(11/2)-~4I_(13/2)无辐射驰豫速率,红光能级~4F_(9/2)得到有效布居,红光比例相对增强。

In this paper, NaYF4：Yb^3＋ and Er^3＋ co-doped NaYF_4 up-conversion luminescent materials were prepared by solvothermal method. The structure, size, morphology and up-conversion luminescence properties of the materials were characterized. The results show that the proportion of F-/Y^3＋ has an important influence on the structure, morphology and size of the material, and the higher F-concentration is conducive to the formation of hexagonal Na YF4. Due to the increase of the vibrational groups with larger phonon in the surface of the smaller size material, the non-radiative relaxation rate of ^4I11/2-^4I13/2 is increased, and the red light level of ^4F9/2 is effectively resided and the red ratio is relatively enhanced.