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Singlet fission from upper excited singlet states and polaron formation in rubrene film
RSC Advances ( IF 3.9 ) Pub Date : 2021-1-22 , DOI: 10.1039/d0ra10780h
Tong Wu 1 , Wenjun Ni 1 , Gagik G Gurzadyan 1 , Licheng Sun 1, 2, 3
Affiliation  

Femtosecond fluorescence up-conversion and transient absorption pump-probe setups are applied to study the relaxation dynamics of the lower and upper excited singlet electronic states in easy-to-make rubrene films. Upon 250 nm (4.96 eV) excitation, singlet fission was observed directly from S2 state bypassing S1 state within 30 fs i.e. breaking the classical Kasha rule. From the transient absorption measurements, polaron formation was also detected on the same time scale. Both singlet fission and polaron formation are accelerated from upper excited states compared with S1 state. Our work shows that rubrene films with low degree of crystallinity could display efficient singlet fission, notably in the case of excitation to upper lying electronic states. This can strongly expand the applications of rubrene in organic electronics. Moreover, our results will provide a new direction for synthesizing novel materials with optimized excited state properties for organic photovoltaic applications.

中文翻译:

上激发单重态的单重裂变和红荧烯薄膜中的极化子形成

飞秒荧光上转换和瞬态吸收泵探针装置用于研究易于制造的红荧烯薄膜中较低和较高激发单重态电子态的弛豫动力学。在 250 nm (4.96 eV) 激发下,在 30 fs 内直接从 S 2态绕过 S 1态观察到单线态裂变,打破了经典的 Kasha 规则。从瞬态吸收测量中,还在同一时间尺度上检测到极化子的形成。与 S 1相比,单线态裂变和极化子的形成都从高激发态加速状态。我们的工作表明,具有低结晶度的红荧烯薄膜可以显示出有效的单线态裂变,特别是在激发到上层电子态的情况下。这可以有力地扩展红荧烯在有机电子学中的应用。此外,我们的研究结果将为合成具有优化激发态特性的新型材料用于有机光伏应用提供新的方向。
更新日期:2021-01-22
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