四烯
单重态裂变
光激发
分子内力
激发态
化学
光化学
单重态
光谱学
超快激光光谱学
能量转换效率
原子物理学
材料科学
光电子学
蒽
物理
立体化学
量子力学
作者
Dirk M. Guldi,Yifan Bo,Yuxuan Hou,Dominik Thiel,Robert Weiß,Timothy Clark,Michael J. Ferguson,Rik R. Tykwinski
标识
DOI:10.26434/chemrxiv-2023-crvs6
摘要
Photon energy conversion can be accomplished in many different ways, including the two opposing manners, down-conversion (i.e., singlet fission, SF) and up-conversion (i.e., triplet-triplet annihilation up-conversion, TTA-UC). Both processes have the potential to help overcome the detailed balance limit of single-junction solar cells. Tetracene, in which the energies of the lowest singlet excited state and twice the triplet excited state are comparable, exhibits both down- and up-conversion. Here, we have designed meta-diethynylphenylene- and 1,3-diethynyladamantyl-linked tetracene dimers, which feature different electronic coupling, to characterize the interplay between intramolecular SF (intra-SF) and intramolecular TTA-UC (intra-TTA-UC) via steady-state and time-resolved absorption and fluorescence spectroscopy. Furthermore, we have used Pd-phthalocyanine as a sensitizer to enable intra-TTA-UC in the two dimers via indirect photoexcitation in the near-infrared part of the solar spectrum. The work is rounded off by temperature-dependent measurements, which outline key aspects of how thermal effects impact intra-SF and intra-TTA-UC in the different dimers.
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