Enhanced green upconversion emission of Er(3+) through energy transfer by Dy(3+) under 800 nm femtosecond-laser excitation |
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Authors: | Li Ai-Hua Lü Qiang Zheng Zhi-Ren Sun Liang Wu Wen-Zhi Liu Wei-Long Chen Heng-Zhi Yang Yan-Qiang Lü Tian-Quan |
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Institution: | Center for Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin, China. |
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Abstract: | Er(3+) green upconversion (UC) emission corresponding to the transition of (4)S(3/2) ((2)H(11/2))-->(4)I(15/2) is enhanced in a Er/Dy-codoped LiNbO(3) crystal compared with Er-doped LiNbO(3) under 800 nm femtosecond-laser excitation at room temperature. The upconversion mechanisms are proposed based on spectral, kinetic, and pump-power dependence analyses. The energy-transfer efficiency from Dy(3+)((4)F(9/2)) to Er(3+)((4)F(7/2)) is 33%, which results in the enhancement of green UC emission. This energy transfer is advantageous for the Er(3+) UC emission sensitized by Dy(3+), especially in a low-phonon-energy host matrix. |
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