High sensitization efficiency and energy transfer routes for population inversion at low pump intensity in Er organic complexes for IR amplification.
High sensitization efficiency and energy transfer routes for population inversion at low pump intensity in Er organic complexes for IR amplification.
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DOI：
10.1038/s41598-018-21700-7
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发表时间：
2018-02-19
影响因子：
4.6
通讯作者：
Gillin WP
中科院分区：
文献类型：
--
作者：
Hu JX;Karamshuk S;Gorbaciova J;Ye HQ;Lu H;Zhang YP;Zheng YX;Liang X;Hernández I;Wyatt PB;Gillin WP
有机铒配合物由于其利用有机物的强吸收来敏化铒发射的潜力而长期受到关注。尽管有这种兴趣，但关于这种方法的有效性的定量信息非常少，并且能量转移机制的讨论通常是模糊的。在这里，我们准确地量化作为一个函数的激发泵密度和模型，它使用速率方程的方法的敏化。结果，我们可以计算出铒离子的粒子数反转程度作为泵浦强度的函数。我们证明，即使当我们增加薄膜中的铒浓度从~10 ~~80%，我们发现一个相对较小的减少，我们归因于大（>20 μ m）的Förster半径的敏化过程中的敏化。我们表明，我们可以在我们的薄膜在非常低的泵浦功率~600 mW/cm 2的粒子数反转。计算出的有机铒配合物的福斯特半径表明，在分子系统和混合有机-无机纳米粒子的天线和铒离子之间的能量转移的设计规则。
Organic erbium complexes have long been of interest due to their potential for using the strong absorption into the organic to sensitise the erbium emission. Despite this interest there is remarkably little quantitative information on how effective the approach is and the discussion of the energy transfer mechanism is generally vague. Here we accurately quantify the sensitisation as a function of excitation pump density and model it using a rate equation approach. As a result, we can calculate the degree of population inversion for the erbium ions as a function of the pump intensity. We demonstrate that even when we increase the erbium concentration in the films from ~10 to ~80% we find a relatively small decrease in the sensitisation which we attribute to the large (>20 Å) Förster radius for the sensitisation process. We show that we can obtain population inversion in our films at very low pump powers ~600 mW/cm2. The calculated Förster radius for the organic erbium complexes suggests design rules for energy transfer between antennas and erbium ions in molecular systems and hybrid organic-inorganic nanoparticles.
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