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Triplet-Fusion Upconversion Using a Rigid Tetracene Homodimer.
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2019-11-21 , DOI: 10.1021/acs.jpclett.9b03115
Christian J Imperiale 1 , Philippe B Green 1 , Ethan G Miller 2 , Niels H Damrauer 2 , Mark W B Wilson 1
Affiliation  

We demonstrate that a structurally rigid, weakly coupled molecular dimer can replace traditional monomeric annihilators for triplet fusion upconversion (TUC) in solution by observing emitted photons (λ = 540 nm) from a norbornyl-bridged tetracene homodimer following excitation of a triplet sensitizer at λ = 730 nm. Intriguingly, steady-state spectroscopy, kinetic simulations, and Stern-Volmer quenching experiments show that the dimer exhibits qualitatively different photophysics than its parent monomer: it is less effective at diffusion-mediated triplet exciton transfer, but it fuses extracted triplets more efficiently. Our results support the development of composite triplet-fusion platforms that go beyond diffusion-mediated triplet extraction, ultimately circumventing the concentration dependence of solution-phase TUC.

中文翻译:

使用刚性Tetracene Homodimer进行三重态融合上转换。

我们证明结构上刚性的,弱耦合的分子二聚体可以代替传统的单体an灭剂,在溶液中通过观察降冰片基桥联的并四苯均二聚体在λ激发下的三重敏化剂后发出的光子(λ= 540 nm)来代替溶液中的三重态融合上转换= 730 nm。有趣的是,稳态光谱,动力学模拟和Stern-Volmer淬灭实验表明,该二聚体与其母体单体相比在质量上具有不同的光物理性质:它在扩散介导的三重态激子转移中效率较低,但可以更有效地融合三重态。我们的研究结果支持了复合三重态融合平台的开发,该平台超越了扩散介导的三重态提取,最终规避了溶液相TUC的浓度依赖性。
更新日期:2019-11-22
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