Photophysics and photochemistry of functionalized anthradithiophene in microcavities

International Conference on Nanoscience, Engineering and Technology (ICONSET 2011) Pub Date : 2022-10-03 DOI:10.1117/12.2632388

Winston T. Goldthwaite, Roshell Lamug, J. V. Van Schenck, Richard Puro, J. Anthony, O. Ostroverkhova

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Abstract

We present a study of photodegradation in functionalized anthraditiophene (diF TES-ADT)-based films in hybrid cavities composed of distributed Bragg reflector (DBR) bottom mirror and top silver (Ag) mirror, depending on two different DBR reflectivity stopbands. The concentration of diF TES-ADT was chosen such that the films contain molecules in “amorphous” and “aggregate” phases characterized by different optical absorption spectra. We demonstrate that the cavity photon preferentially couples to the molecules in the “amorphous” phase and observe different photodegradation, attributed to photodimerization, dynamics for cavity photon-coupled and uncoupled states. The presence of the longer lived emissive states, such as entangled triplet pair (TT) states formed in the process of singlet fission, was correlated with a faster photodimerization dynamics. The observed cavity-dependent photodimerization dynamics offers an opportunity to manipulate the reaction rates and yield with cavity characteristics.

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微腔中功能化蒽噻吩的光物理和光化学研究

我们研究了基于功能化蒽酮(diF TES-ADT)的薄膜在由分布式布拉格反射镜(DBR)底镜和顶银(Ag)镜组成的混合腔中的光降解，取决于两个不同的DBR反射率阻带。选择diF TES-ADT的浓度，使薄膜包含具有不同光学吸收光谱特征的“非晶”相和“聚集”相分子。我们证明了腔光子优先耦合到“非晶”相的分子，并观察到不同的光降解，归因于光二聚化，腔光子耦合和不耦合状态的动力学。单线态裂变过程中形成的纠缠三重态(TT)等长寿命发射态的存在与更快的光二聚化动力学有关。观察到的依赖于空腔的光二聚化动力学提供了一个利用空腔特性来操纵反应速率和产率的机会。

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International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)

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