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Long-Lifetime Nonlinear Absorption of PbS Quantum Dots

机译:PbS量子点的长期非线性吸收

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摘要

We have fabricated PbS particles in glass of average size from 1.2 nm to 3 nm. This allows us to tune the energy of the lowest electron-hole pair transition from 1.7 eV to 0.8 eV respectively. Optical absorption spectra show a pronounced quantum peak, implying a narrow size distribution. We have performed pump-probe spectroscopy where the probe is cw and the pump is nanosecond; this allows us to investigate a wide time scale. We have observed bleaching of the lowest quantum peak with lifetimes of ~2 microseconds. We interpret this in terms of trapped carriers. Phenomenological description of observed effect is also presented.
机译:我们已经在玻璃中制造了PbS颗粒,平均尺寸为1.2 nm至3 nm。这使我们可以将最低的电子-空穴对跃迁的能量分别从1.7 eV调节到0.8 eV。光学吸收光谱显示出明显的量子峰,这意味着窄的尺寸分布。我们执行了泵探针光谱学,其中探针为顺时针,泵为纳秒;这使我们能够研究广泛的时间尺度。我们已经观察到最低量子峰的漂白,其寿命约为2微秒。我们用被困的载波来解释。还介绍了观察到的影响的现象学描述。

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