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The influence of energy migration on luminescence kinetics parameters in upconversion nanoparticles

机译:能量迁移对升高纳米粒子发光动力学参数的影响

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摘要

The mechanism of upconversion at the nanoscale is still under discussion. In this paper, we report on the experimental results of anti-Stokes luminescence kinetics in the upconversion nanoparticles of beta-NaYF4: 20% Yb3+; 0.6% Tm3+. The parameters of the luminescence kinetics were found to be unambiguously dependent on the number of excitation quanta n, which are necessary for certain transitions between the energy states of thulium ions. The observed correlation has been explained by means of the long-lasting energy migration between the ytterbium ions. The spread in time between the luminescent maxima of the corresponding thulium transitions not only shows the nonlinear character of upconversion, but also reveals the time scale of energy migration as well. From these, we derive that the conventional Forster formalism applied to the estimation of energy transfer efficiency in UCNP-fluorophore pairs can provide misleading results.
机译:纳米级上的升级机制仍在讨论中。 在本文中,我们报告了β-Nayf4:20%YB3 +的上转换纳米颗粒中的抗Stokes发光动力学的实验结果。 0.6%TM3 +。 发现发光动力学的参数毫不含糊地取决于激发量子N的数量,这对于细胞离子的能量状态之间的某些转变是必要的。 通过镱离子之间的长持久的能量迁移,已经说明了观察到的相关性。 相应的尺度转换的发光最大值之间的时间差距不仅显示了上变频的非线性特性,而且还揭示了能量迁移的时间规模。 从这些中,我们得出了在UCNP-荧光团对中应用于能量转移效率估计的传统福尔特形式可以提供误导性结果。

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