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量子点虽然广泛应用于生物荧光标记,但仍停留在实验阶段,目前还不能通过实验的办法得到量子点的荧光分布特征。利用有限元的方法对量子点的荧光场分布特征进行了数值模拟计算,选取几种不同材料球形量子点进行电磁散射分析,论述了量子点的荧光场分布规律。通过对单个量子点进行荧光场分析,确定了CdSe量子点、CdTe量子点荧光共振能量转移模型,计算结果表明:量子点的荧光场的分布规律可以由量子点的电磁散射场给出,对量子点散射场的分析有助于我们更细致地了解量子点荧光共振能量转移的过程,对于探知一般实验无法得到的量子点荧光场分布规律是可行的。该结果对控制量子点的荧光分布,提高量子点荧光效率具有重要的实际意义。
Although quantum dots are widely used in biological fluorescent markers, they still remain in the experimental stage. At present, the fluorescence distribution characteristics of quantum dots can not be obtained experimentally. The finite element method was used to simulate the distribution of the fluorescence field of quantum dots. Several spherical quantum dots of different materials were selected for electromagnetic scattering analysis. The distribution of the fluorescence field of quantum dots was discussed. The fluorescence resonance energy transfer model of CdSe QDs and CdTe QDs was determined by fluorescence field analysis of a single QD. The results show that the distribution of QDs can be given by the electromagnetic scattering field of QDs, The analysis of point scattering field helps us understand the process of fluorescence resonance energy transfer in more detail. It is feasible to find out the regular distribution of fluorescence field in quantum dots that can not be obtained by general experiments. The results have important practical significance for controlling the fluorescence distribution of quantum dots and improving the fluorescence efficiency of quantum dots.