摘要
采用水热合成法,以油酸作乳化剂成功制备了Yb^(3+)-Tb^(3+)共掺杂β-NaYF_4纳米晶。采用X射线衍射(XRD)、扫描电子显微镜(SEM)和荧光光谱仪对所制备的样品进行表征。在980 nm红外半导体激光器的激发下,不仅观察到Yb^(3+)/Tb^(3+)共掺杂NaYF_4纳米晶对应于Tb^(3+)离子5D3→7FI(I=6,5和4)和5D4→7FI(I=6,5,4和3)能级跃迁从红色到紫外的上转换荧光,同时还观察到了杂质离子Er^(3+)的发光。实验发现随着Yb^(3+)浓度的相对减小和Er^(3+)浓度的相对增大,489 nm对应于Tb^(3+)离子5D4→7F6能级跃迁的上转换蓝光得到增强。在Yb^(3+)-Tb^(3+)-Er^(3+)系统中,简要地讨论了从Yb^(3+)到Er^(3+)再到Tb^(3+)的能量传递过程。
Yb^3＋ -Tb^3＋ co-doped NaYF4 nanocrystals were synthesized by employing a facile hydrothermal method using oleic acid as stabilizing agent. The as-prepared nanocrystals were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and luminescence spectroscopy. The up-conversion emissions of Tb^3 ＋ , corresponding to ^5 D3→^7 FI （ I = 6, 5, 4 ） and ^5 D4→^7 FI （ I = 6, 5, 4, 3 ） were observed under 980 nm infrared diode laser excitation. In addition, several emissions of Er^3 ＋ impurity were also observed. With the decreasing of Yb^3 ＋ and increasing of Er^3＋ , the blue emission （489 nm） enhanced, which originate from the ^5D4→^7F6 transitions of Tb^3＋ ions. The possible UC mechanisms in Yb^3＋ -Tb^3＋ -Er^3＋ system were discussed briefly.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2016年第5期544-548,共5页
Journal of the Chinese Society of Rare Earths
基金
高校优秀青年人才支持计划重点项目(gxyq ZD2016329
gxyq ZD2016328)
滁州学院科研启动基金项目(2014qd024)资助
关键词
上转换
纳米晶
NAYF4
稀土
up-conversion
nanocrystals
NaYF4
rare earths
