標題: Er-Yb Codoped Ferroelectrics for Controlling Visible Upconversion Emissions
作者: Huang, Tung-Ching
Hsieh, Wen-Feng
光電工程學系
Department of Photonics
關鍵字: Upconversion;Fluorescence;Rare-earth;X-ray diffraction;Crystal structure
公開日期: 1-May-2009
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 Er(3+) and Yb(3+) codoped PbTiO(3), BaTiO(3), and SrTiO(3) polycrystalline powders. The efficiency of the EBT process depends not only on Yb(3+) concentration but also on level match of the doped Er(3+) and Yb(3+) 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 (4)S(3/2) -> (4) I(13/2) of Er(3+) and (2)F(7/2) -> (2) F(5/2) of Yb(3+). This level match is responsible for enhancing red UC emission.
URI: http://dx.doi.org/10.1007/s10895-008-0440-0
http://hdl.handle.net/11536/7305
ISSN: 1053-0509
DOI: 10.1007/s10895-008-0440-0
期刊: JOURNAL OF FLUORESCENCE
Volume: 19
Issue: 3
起始頁: 511
結束頁: 516
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