Understanding the photophysical interactions between the components in organic-inorganic nanocomposites is a key factor for their efficient application in optoelectronic devices. In particular, the photophysical study of nanocomposites based on organic conjugated polymers is rare. We investigated the effect of surface plasmon resonance (SPR) of gold nanoparticles (Au NPs) on the photoluminescence (PL) property of a push-pull conjugated polymer (PBDB-T). We prepared the hybrid system by incorporating poly(3-hexylthiophene)-stabilized Au NPs (P3HT-Au NPs) into PBDB-T. The enhanced and blueshifted PL was observed in the hybrid system compared to PL in a neat PBDB-T system, indicating that the P3HT chains attached to the Au NPs suppressed charge-transfer from PBDB-T to the Au NPs and relayed the hot electrons to PBDB-T (the band-filling effect). This photophysical phenomenon limited the auto-dissociation of PBDB-T excitons. Thus, the radiative recombination of the excitons occurred more in our hybrid system than in the neat system.

中文翻译：

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阐明了金纳米颗粒热电子注入诱导的推挽共轭聚合物中的光致发光增强机理

了解有机无机纳米复合材料中各组分之间的光物理相互作用是其在光电器件中有效应用的关键因素。特别地，基于有机共轭聚合物的纳米复合材料的光物理研究很少。我们研究了金纳米粒子（Au NPs）的表面等离子体共振（SPR）对推挽共轭聚合物（PBDB-T）的光致发光（PL）性能的影响。我们通过将聚（3-己基噻吩）稳定的Au NP（P3HT-Au NP）掺入PBDB-T中来制备混合系统。与纯PBDB-T系统中的PL相比，在混合系统中观察到PL的增强和蓝移，表明连接到Au NP的P3HT链抑制了电荷从PBDB-T转移到Au NP并将热电子中继到PBDB-T（带填充效果）。这种光物理现象限制了PBDB-T激子的自解离。因此，激子的辐射复合发生在我们的混合系统中，而不是纯系统中。