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首页> 外文期刊>Physical review. B, Condensed Matter And Materals Physics >Luminescence blinking of a Si quantum dot in a SiO_2 shell
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Luminescence blinking of a Si quantum dot in a SiO_2 shell

机译：SiO_2壳中Si量子点的发光闪烁

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摘要

The phenomenon of on-off luminescence intermittency-blinking-in silicon nanocrystals was studied using a single-dot microphotoluminescence technique. From recordings of the luminescence intensity trace, on-and off-time distributions were extracted revealing exponential behavior, as expected for systems with blinking of a purely random nature. The corresponding switching rates for on-off and off-on processes exhibit different dependence on the excitation intensity. While the on-off switching rate grows quadratically with the excitation, the inverse process is nearly pumping power independent. Experimental findings are interpreted in terms of a dot "charging" model, where a carrier may become trapped in the surrounding matrix due to thermal and Auger-assisted processes. Observed blinking kinetics appear to be different from that of porous silicon particles.
机译：使用单点微光致发光技术研究了硅纳米晶体中的开-关发光间歇闪烁现象。从发光强度轨迹的记录中，提取了按时间和时间分布，揭示了指数行为，这与纯随机闪烁的系统一样。用于开-关和关-开过程的相应开关速率表现出对激发强度的不同依赖关系。开关频率随激励呈二次方增长时，逆过程几乎与泵浦功率无关。实验发现是根据点“充电”模型来解释的，在该模型中，由于热过程和俄歇辅助过程，载体可能会陷入周围的基质中。观察到的眨眼动力学似乎不同于多孔硅颗粒。

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