Distinguishing between Triplet-Pair State and Excimer Emission in Singlet Fission Chromophores Using Mixed Thin Films

Distinguishing between Triplet-Pair State and Excimer Emission in Singlet Fission Chromophores Using Mixed Thin Films
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使用混合薄膜区分单线态裂变发色团中的三重态对状态和准分子发射

DOI:
10.1021/acs.jpcc.1c09297
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发表时间:
2022
期刊:
The Journal of Physical Chemistry C
影响因子:
--
通讯作者:
Broch, Katharina
Broch, Katharina
中科院分区:
--
文献类型:
--
作者:
Hausch, Julian;Berges, Adam J.;Zeiser, Clemens;Rammler, Tim;Morlok, Arne;Bredehöft, Jona;Hammer, Sebastian;Pflaum, Jens;Bardeen, Christopher J.;Broch, Katharina

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在由单重态裂变(SF)材料制成的薄膜的光致发光谱中,从自由激子发射红移的发射特征特别令人感兴趣。它们可以是相关的三重态对状态的指纹,因此可以深入了解多步SF过程的机制。然而,激基缔合物形成或陷阱态布居也可能导致这样的特征,并且各种贡献的明确解缠结可能具有挑战性。在这里,我们使用的anthradiothiophene(ADT)和弱相互作用的有机半导体的混合物来控制分子环境的极化率,从而区分激基缔合物发射和发射的相关三重态对状态。利用时间分辨光致发光光谱测量,我们澄清准分子形成和SF ADT之间的关系,发现准分子形成构成了一个平行的激子弛豫通道,既不介导,也不阻碍SF。
In the photoluminescence spectra of thin films made of singlet fission (SF) materials emission features that are red-shifted from the free exciton emission are of particular interest. They can be fingerprints of the correlated triplet-pair state and as such offer insights into the mechanisms of the multistep SF process. However, excimer formation or trap-state population can also cause such features and a clear disentanglement of the various contributions can be challenging. Here, we use blends of anthradithiophene (ADT) and weakly interacting organic semiconductors to control the polarizability of the molecular environment and, thus, to distinguish between excimer emission and emission from the correlated triplet-pair state. Using time-resolved photoluminescence spectroscopy measurements, we clarify the relation between excimer formation and SF in ADT and find that excimer formation constitutes a parallel relaxation channel for the exciton and neither mediates nor hinders SF.
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