NaYF_4∶Yb,Er超细纳米晶的合成及单带红色上转换发光研究  

Synthesis and pure red upconversion emission of NaYF_4∶ Yb^(3+),Er^(3+) ultrathin nanocrystals

作　　者：刘旺东[1] 李文斌[1] 谭丛兵[1] 刘云新[1] 

机构地区：[1]湖南科技大学物理与电子科学学院,湖南湘潭411201

出　　处：《功能材料》2014年第17期17113-17115,共3页Journal of Functional Materials

基　　金：国家青年科学基金资助项目(21301058)

摘　　要：通过水热法成功合成了直径约为3 nm的NaYF4∶Yb,Er超细纳米晶。荧光光谱测试表明,其发射波长位于660 nm的单带红光,其杂质光的含量低于1/99.6。机理研究表明超细纳米晶的尺寸效应产生的表面高能量振动声子和激发光子的高表面散射率导致4F7/2能级上的电子通过消耗基质声子能量而向下弛豫到4S3/2和2H11/2的概率大大降低,而主要通过4F7/2+4I11/2-2×2F9/2跃迁过程布居4F9/2能级,从而实现强红光发射。NaYF4 ∶ Yb3 ＋ ,Er3 ＋ ultrathin nanocrystals with average diameter of about 3 nm were successfully synthesized by hydrothermal method.The fluorescent spectra indicate that the sample emits single-red band light with impurity emission lower than 1/99.6.The mechanism analysis indicates that the size-effect leads to the surface high energy oscillation phonons and high scattering probability of excitation photons,which leads to the depopulation probability of 4 F7/2 states to 4 S3/2 and 2 H 1 1/2 states decreases greatly while the4 F7/2 ＋4 I1 1/2 -2 ＆#215;2 F9/2 transition was remarkalbly enhanced.As a result,the intense red emission was realized.

关 键 词：NAYF4 超细纳米晶 稀土 上转换发光 

分 类 号：O482.31[理学—固体物理]