Quantitative Analysis of Energy Transfer and Origin of Quenching in Er3+/Ho3+ Codoped Germanosilicate Glasses

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• 作者：Tao Wei ; Ying Tian ; Cong Tian ; Muzhi Cai ; Xufeng Jing ; Bingpeng Li ; Rong Chen ; Junjie Zhang ; Shiqing Xu
• 刊名：Journal of Physical Chemistry A
• 出版年：2015
• 出版时间：July 2, 2015
• 年：2015
• 卷：119
• 期：26
• 页码：6823-6830
• 全文大小：497K
• ISSN：1520-5215

文摘

The energy transfer mechanism between Ho³⁺ and Er³⁺ ions has been investigated in germanosilicate glass excited by 980 nm laser diode. A rate equation model was developed to demonstrate the energy transfer from Er³⁺ to Ho³⁺ ions, quantitatively. Energy transfer efficiency from the Er³⁺:⁴I_13/2 to the Ho³⁺:⁵I₇ level can reach as high as 75%. Such a high efficiency was attributed to the excellent matching of the host phonon energy with the energy gap between Er³⁺:⁴I_13/2 and Ho³⁺:⁵I₇ levels. In addition, the energy transfer microparameter (C_DA) from Er³⁺:⁴I_13/2 to Ho³⁺:⁵I₇ level was estimated to (4.16 卤 0.03) 脳 10^鈥?0 cm⁶路s^鈥? via the host-assisted spectral overlap function, coinciding with the C_DA (2,88 卤 0.04) 脳 10^鈥?0 cm⁶路s^鈥? from decay analysis of the Er³⁺:⁴I_13/2 level which also indicated hopping migration-assisted energy transfer. Furthermore, the concentration quenching of Ho³⁺:⁵I₇ 鈫?⁵I₈ transition was the dipole鈥揹ipole interaction in the diffusion-limited regime, and the quenching concentration of Ho³⁺ reached 4.13 脳 10²⁰ cm^鈥?.