The steady-state and photoinduced dynamical optical properties of two squaraine-bodipy dye conjugates are the focus of this work. While the squared absorption transition moments of the dye conjugates can be traced back in an additive way to the constituents of the conjugates, this is not possible for the squared fluorescence transition moments. We suggest an enhancement of electronic coupling in the relaxed excited state to be responsible for this observation. Transient absorption and fluorescence upconversion experiments with femtosecond-time resolution give insight into the relaxation phenomena of the dye conjugates, in particular concerning the relaxation within the exciton manifold.

中文翻译：

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弛豫激发态中激子耦合的增强

两种方酸-bodipy染料共轭物的稳态和光诱导动力学光学性质是这项工作的重点。尽管染料缀合物的平方吸收跃迁矩可以以累加的方式追溯到缀合物的成分，但是对于平方荧光跃迁矩则不可能。我们建议增强在弛豫激发态下的电子耦合来负责此观察。飞秒分辨率的瞬态吸收和荧光上转换实验使人们深入了解了染料偶联物的弛豫现象，特别是关于激子流形内的弛豫。