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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Evidence for a diffusion-controlled mechanism for fluorescence blinking of colloidal quantum dots
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Evidence for a diffusion-controlled mechanism for fluorescence blinking of colloidal quantum dots

机译:胶体量子点荧光闪烁的扩散控制机制的证据

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摘要

Fluorescence blinking in nanocrystal quantum dots is known to exhibit power-law dynamics, and several different mechanisms have been proposed to explain this behavior. We have extended the measurement of quantum-dot blinking by characterizing fluctuations in the fluorescence of single dots over time scales from microseconds to seconds. The power spectral density of these fluctuations indicates a change in the power-law statistics that occurs at a time scale of several milliseconds, providing an important constraint on possible mechanisms for the blinking. In particular, the observations are consistent with the predictions of models wherein blinking is controlled by diffusion of the energies of electron or hole trap states.
机译:已知纳米晶体量子点中的荧光闪烁表现出幂律动力学,并且已经提出了几种不同的机制来解释这种行为。我们已经通过表征单个点的荧光在从微秒到秒的时间范围内的波动来扩展了量子点闪烁的测量范围。这些波动的功率谱密度表明,在几毫秒的时间范围内发生的幂律统计变化,对可能的闪烁机制提供了重要的约束。特别地,这些观察结果与模型的预测一致,在模型预测中,眨眼是通过电子或空穴陷阱态能量的扩散来控制的。

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