The photophysical properties of a donor–acceptor compound based on triphenylamine-modified vinylbenzothiazole derivative (BTTM) are investigated by multispectral techniques. Based on the pump–probe and pump–dump/push–probe technique, it is found that the hybridized localized excited (LE) and charge transfer (CT) state (HLCT) participates in the relaxation process of excited BTTM. The excited state is the LE-dominated HLCT state in cyclohexane; then it evolves to the CT-dominated HLCT state in a high polarity solvent. Meanwhile, a new intermediate state named the HLCT′ state also exists in a high polar solvent. When the temperature of BTTM film drops, the increasing photoluminescence (PL) lifetime and PL quantum yield are assigned to the nonradiative recombination inactivation. The pump–probe data show that exciton–exciton annihilation originating from exciton collision gradually increases owing to the weakening of phonon–exciton scattering at low temperature. Our results provide comprehensive insight into the optoelectronic properties of organic molecules.

中文翻译：

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扫描三苯胺改性的乙烯基苯并噻唑衍生物的超快光谱动力学：溶剂极性和温度的作用。

通过多光谱技术研究了基于三苯胺改性的乙烯基苯并噻唑衍生物（BTTM）的供体-受体化合物的光物理性质。基于泵浦-探针和泵浦-转储/推动-探针技术，发现混合的局部激发态（LE）和电荷转移（CT）状态（HLCT）参与了BTTM激发的弛豫过程。激发态是环己烷中LE为主的HLCT状态；然后在高极性溶剂中演化为CT为主的HLCT状态。同时，在高极性溶剂中也存在称为HLCT'状态的新的中间状态。当BTTM薄膜的温度下降时，增加的光致发光（PL）寿命和PL量子产率将归因于非辐射复合失活。泵浦-探针数据显示，由于低温下声子-激子散射的减弱，激子碰撞引起的激子-激子an灭逐渐增加。我们的结果为有机分子的光电特性提供了全面的见解。