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Enhanced green upconversion emission of Er~(3+) through energy transfer by Dy~(3+) under 800 nm femtosecond-laser excitation

机译:在800 nm飞秒激光激发下通过Dy〜(3+)的能量转移增强Er〜(3+)的绿色上转换发射

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摘要

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 33percent, 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.
机译:对应于〜(4)S_(3/2)(〜(2)H_(11/2))->〜(4)I_(15/2)过渡的Er〜(3+)绿色上转换(UC)发射与掺Er的LiNbO_(3)相比,在室温下800 nm飞秒激光激发下,掺Er / Dy的LiNbO_(3)晶体中的)增强。根据频谱,动力学和泵浦功率相关性分析,提出了上转换机制。从Dy〜(3 +)(〜(4)F_(9/2))到Er〜(3 +)(〜(4)F_(7/2))的能量转移效率为33%,导致增强绿色UC排放。这种能量转移对于Dy〜(3+)敏感的Er〜(3+)UC发射是有利的,尤其是在低声子能量主体矩阵中。

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