摘要
基于时间相关单光子计数技术,研究了金纳米颗粒对CdSe/ZnS量子点荧光自发辐射的影响。制备了与金纳米颗粒有效耦合的量子点样品,测量了高浓度量子点样品的荧光寿命,发现金纳米颗粒能够显著降低量子点的荧光寿命。研究了单量子点的荧光特性,发现单量子点与金纳米颗粒耦合时,荧光寿命降低到无金纳米颗粒时的1%左右。通过数值计算,研究了量子点偏振方向,量子点与金纳米颗粒间的距离,以及金纳米颗粒直径等参数对量子点荧光自发辐射速率的影响。
The effect of gold nanoparticles on the fluorescence spontaneous emission of CdSe/ZnS quantum dots(QDs)is investigated based on the time-correlated single photon counting technique.The quantum dot samples coupled with gold nanoparticles effectively are prepared.The fluorescence lifetime of QDs with a high concentration is measured,and it is found that the fluorescence lifetime of QDs can be significantly reduced by the gold nanoparticles.The fluorescence properties of a single QD are also studied and it is found that the fluorescence lifetime of the quantum dot coupled with gold nanoparticles is reduced to about one percent of that without gold nanoparticles.The effects of the polarization direction of QDs,the distance between the QDs and the gold nanoparticles,the diameters of gold nanoparticles and other parameters on the fluorescence spontaneous emission rate of QDs are investigated by the numerical calculation.
引文
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