Conjugated polymer-based light-harvesting systems have been the subject of research because of their multichromophoric property. Here, we mainly emphasize on the ultrafast relaxation dynamics of poly [9,9-dioctylfluorene-alt-benzothiadiazole] (F8BT) polymer nanoparticles (PNPs) at various time scales, and the time scales of energy funneling from PNPs to encapsulated Nile Red (NR) dye are estimated using global and target analysis of the transient absorption data matrix. The red shift in ground-state bleaching of evolution-associated difference spectrum (EADS) indicates the formation of the collective delocalized state (CL_s) in PNPs. It is to be noted that the life times of three excited states of PNPs (S₁^Hot, S₁, and CL_S) are found to be decreased after encapsulation of the acceptor dye, and it is evident that the energy transfer occurs from these three excited states of PNPs to the dye. Further, the concomitant decay component (8.1 ps) of the donor and the rise time (8.3 ps) of the acceptor confirm the energy transfer from PNPs to the NR dye. Such fundamental understanding of photophysics of dye-encapsulated PNPs will assist in designing efficient light-harvesting systems based on dye-conjugated polymer composite materials.

中文翻译：

---

基于共轭聚合物的宿主-客体光收集系统中的超快能流动力学

基于共轭聚合物的光收集系统由于其多发色性而成为研究的主题。在这里，我们主要强调聚超快弛豫动力学[9,9- dioctylfluorene- ALT -benzothiadiazole]（F8BT）聚合物的纳米颗粒（的PNP）在不同的时间尺度，和能量漏斗的时间尺度从的PNP包封尼罗红（ NR）染料是使用瞬态吸收数据矩阵的全局和目标分析来估算的。进化相关差异谱（EADS）的基态漂白中的红移表明在PNP中形成了集体离域态（CL _s）。要注意的是，PNP的三个激发态（S ₁ ^Hot，S ₁和CL）的寿命发现_S）在包封受体染料后降低，并且明显的是，能量从PNP的这三种激发态发生到染料上。此外，供体的伴随衰减分量（8.1 ps）和受体的上升时间（8.3 ps）证实了从PNP到NR染料的能量转移。对染料包封的PNP的光物理学的这种基本理解将有助于设计基于染料共轭聚合物复合材料的高效光收集系统。