单重态-三重态湮灭限制了聚3-己基噻吩的激子产额
Singlet-triplet annihilation limits exciton yield in poly(3-hexylthiophene)
摘要：
结合单分子光谱学技术的链长和形态的控制提供了一个全面的电子物理图片的激发态损失的原型共轭聚合物聚（3-己基噻吩）（P3 HT）。一个普遍的自猝灭机制，揭示了单重态-三重态激子湮灭的基础上，占一个单一的P3 HT链的荧光量子产率之间的溶液（未折叠）和散装（折叠）状态的戏剧性损失。三重态激子从根本上限制了有机光伏材料的荧光，这影响了单重态激子向分离的载流子的转化，降低了在高激发密度下的能量收集效率。激发间相互作用是如此有效，以至于>100 kDa重量的单个P3 HT链表现得像一个两级系统，表现出完美的光子反聚束。
英文摘要：
Control of chain length and morphology in combination with single-molecule spectroscopy techniques provide a comprehensive photophysical picture of excited-state losses in the prototypical conjugated polymer poly(3-hexylthiophene) (P3HT). A universal self-quenching mechanism is revealed, based on singlet-triplet exciton annihilation, which accounts for the dramatic loss in fluorescence quantum yield of a single P3HT chain between its solution (unfolded) and bulk-like (folded) state. Triplet excitons fundamentally limit the fluorescence of organic photovoltaic materials, which impacts on the conversion of singlet excitons to separated charge carriers, decreasing the efficiency of energy harvesting at high excitation densities. Interexcitonic interactions are so effective that a single P3HT chain of >100 kDa weight behaves like a two-level system, exhibiting perfect photon-antibunching.
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