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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Spin Dynamics of Quintet and Triplet States Resulting from Singlet Fission in Oriented Terrylenediimide and Quaterrylenediimide Films
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Spin Dynamics of Quintet and Triplet States Resulting from Singlet Fission in Oriented Terrylenediimide and Quaterrylenediimide Films

机译：Quintet和三联状态的旋转动态由取向氟氯化酰亚胺和Quatametryleni酰亚胺膜中的单线裂变产生

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Singlet fission in organic semiconductors provides an important opportunity to study high-spin states in electronically coupled chromophores. Photoexcitation of oriented, crystalline films of N,N-bis(pentadec-8-yl)terrylene-3,4:11,12-bis(dicarboximide) (TDI) and N,N-bis (pentadec-8-yl)quaterrylene-3,4:13,14-bis(dicarboximide) (QDI) result in the formation of the correlated triplet pair quintet state, (5)(T1T1) and its subsequent dissociation into two triplet (T-1) excitons. Time-resolved electron paramagnetic resonance (TREPR) spectroscopy and X-ray crystallography are used to show that the orientation dependence of (5)(T1T1) spin dynamics is retained as it dissociates into two T-1 excitons, while such information is lost in a randomly oriented sample. In addition, the spin dynamics depend on how the molecules are oriented relative to the external applied magnetic field. Dissociation of (5)(T1T1) to form two T-1 excitons is more efficient in TDI and leads to a longer T-1 lifetime than in QDI, making TDI a more viable candidate for photovoltaic applications. Since QDI readily forms a highly oriented film, and the lifetime of its (5)(T1T1) state is longer than that of TDI, it may be a good candidate for quantum information science applications that require the generation of a quantum- entangled, four-spin state.
机译：有机半导体中的单线裂变提供了在电子偶联发色团中研究高旋转状态的重要机会。 N，N-BIS（Pentadec-8-基）叔丁烯-3,4：11,12-双（二羰基胺）（TDI）和N，N-BIS（Pentadec-8-基）溴代丙烯，N - BIS（Pentadec-8-基）的光孔，结晶膜，N-Bis（Pentadec-8-基）酯萜烯-3,4：11,12-双（二烷基-8-基） -3,4：13,14-双（二羧酰亚胺）（QDI）导致形成相关的三重态对Quintet状态，（5）（T1T1）及其随后的解离分为两个三重态（T-1）激子。时间分辨的电子顺磁共振（TREPR）光谱和X射线晶体学用于表明（5）（T1T1）旋转动力学的取向依赖性被保留，因为它离解成两个T-1激子，而这些信息丢失随机定向的样本。此外，旋转动力学取决于分子如何相对于外部施加的磁场定向。 （5）（T1T1）的解离在TDI中形成两个T-1激子在TDI中更有效，并且导致比QDI更长的T-1寿命，使TDI成为光伏应用的更加活泼的候选者。由于QDI容易形成高度导向的薄膜，并且其（5）（T1T1）状态的寿命长于TDI的寿命，这可能是需要产生量子缠结的量子信息的量子信息科学应用程序的良好候选者 - 模特状态。

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