Multiple Energy Transfer Dynamics in Blended Conjugated Polymer Nanoparticles

Multiple Energy Transfer Dynamics in Blended Conjugated Polymer Nanoparticles
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共轭聚合物纳米颗粒的多重能量传递动力学

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发表时间:
2014
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影响因子:
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通讯作者:
J. McNeill
J. McNeill
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作者:
Xiaoli Wang;Louis C. Groff;J. McNeill

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研究了共混共轭聚合物纳米粒子(CPN)中的能量传递动力学,以加深我们对先前观察到的光开关和反常饱和行为的理解,并作为一种方法来探索在类似的感兴趣的系统中发生的复杂的能量传递过程,例如纳米结构的体异质结光伏器件。制备了不同共混比的共混型poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(1,4-benzo-{2,1′,3}-thiadiazole)](PFBT)/poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene]纳米粒子。观察到了从PFBT到MEH-PPV的有效能量转移,产生了明亮的红移发射。在复杂的、纳米尺度的、多发色的体系中,施主呈现出与能量传递一致的复杂的衰减动力学。将荧光衰减动力学和稳态猝灭效率与多重能量转移模型和先前的结果进行了比较。分析表明,较高的能源率是最高的。
Energy transfer dynamics in blended conjugated polymer nanoparticles (CPNs) were investigated in order to further our understanding of photoswitching and anomalous saturation behavior we previously observed, and as a way to probe the complex energy transport processes occurring in similar systems of interest such as nanostructured bulk heterojunction photovoltaic devices. We prepared blended poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(1,4-benzo-{2,1′,3}-thiadiazole)] (PFBT)/poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) nanoparticles with varying blending ratios. Efficient energy transfer from PFBT to MEH-PPV was observed, yielding bright, red-shifted emission. The donor exhibited complex decay kinetics consistent with energy transfer in complex, nanoscale, multichromophoric systems. The fluorescence decay kinetics and steady-state quenching efficiencies are compared to a multiple energy transfer model and prior results for dye-doped nanoparticles. The analysis indicates that the high en...
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