Er-Yb Codoped Ferroelectrics for Controlling Visible Upconversion Emissions

被引：34
|
作者：
Huang, Tung-Ching [1 ,2 ]
Hsieh, Wen-Feng [1 ,2 ]
机构：
[1] Natl Chiao Tung Univ, Dept Photon, Hsinchu 30050, Taiwan
[2] Natl Chiao Tung Univ, Inst Electroopt, Hsinchu 30050, Taiwan
来源：
JOURNAL OF FLUORESCENCE | 2009年 / 19卷 / 03期
关键词：
Upconversion; Fluorescence; Rare-earth; X-ray diffraction; Crystal structure; ENERGY-LEVELS; LUMINESCENCE; DEPENDENCE; PHOSPHORS; SPECTRA; SIZE;
D O I：
10.1007/s10895-008-0440-0
中图分类号：
Q5 [生物化学];
学科分类号：
071010 ; 081704 ;
摘要：
Under a 980 nm laser pumping, quenching of green upconversion (UC) emission accompanied with enhancement of red UC emission observed was dominated by the energy back-transfer (EBT) process in Er3+ and Yb3+ codoped PbTiO3, BaTiO3, and SrTiO3 polycrystalline powders. The efficiency of the EBT process depends not only on Yb3+ concentration but also on level match of the doped Er3+ and Yb3+ ions caused by the crystal fields with different symmetries. Our UC emission spectra and X-ray diffraction confirm that the centrosymmetric crystal field arising from reducing tetragonality causes level match of transition S-4(3/2) -> (4) I-13/2 of Er3+ and F-2(7/2) -> (2) F-5/2 of Yb3+. This level match is responsible for enhancing red UC emission.
引用
收藏
页码：511 / 516
页数：6
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