We investigated the excited-state dynamics of a conjugated polymer (CP:P3HT)-based ternary hybrid system containing P3HT-coated gold nanoparticles and quantum dots. Transient absorption spectroscopy results revealed that polaron pairs (PPs) originating from nonrelaxed singlet (S₁) excitons of the CP aggregate in the ternary system have shorter electron–hole separation distances than those of PPs in the neat CP aggregate because of the photophysical effects of plasmonic and semiconductor nanocrystals. In particular, the shorter electron–hole distances of PPs led to more back-recombination to S₁ excitons than dissociation into positive polarons in the ternary system, resulting in increased S₁ radiative recombination compared with that in the neat CP system. Thus, the photoluminescence intensity of the CP aggregate in the ternary system increased. Our findings provide new insights into the excited-state dynamics of CPs and pave the way for the development of next-generation high-efficiency optoelectronic devices.

中文翻译：

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通过等离子体和半导体纳米晶体在共轭聚合物聚集体中对子对介导的单线态激子的辐射复合


我们研究了基于 C共轭聚合物 （CP：P3HT） 的三元杂化系统的激发态动力学，该系统包含 P3HT 涂层的金纳米颗粒和量子点。瞬态吸收光谱结果表明，由于等离子体和半导体纳米晶的光物理效应，源自三元系统中 CP 聚集体的非松弛单线态 （S₁） 激子对 （PPs） 的电子-空穴分离距离比纯 CP 聚集体中的 PPs 短。特别是，PPs 较短的电子-空穴距离导致三元系统中对 S₁ 激子的反复合多于解离成正极化子，导致 S₁ 辐射复合与纯 CP 系统相比增加。因此，三元系统中 CP 聚集体的光致发光强度增加。我们的研究结果为 CP 的激发态动力学提供了新的见解，并为下一代高效光电器件的开发铺平了道路。