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Tuning Spin Dynamics in Crystalline Tetracene.

08:00 EDT 2nd April 2019 | BioPortfolio

Summary of "Tuning Spin Dynamics in Crystalline Tetracene."

Tetracene is the archetypal material undergoing singlet fission - the generation of a pair of triplet excitons from one singlet exciton. Here, using time-resolved electron spin resonance, we show how the spin dynamics in tetracene crystals are influenced by temperature and morphology. On cooling from 300 to 200 K, we observe a switch between singlet fission and intersystem crossing generated triplets, manifesting as an inversion in transient spin polarization. We extract a spin dephasing time of approximately 40 ns for fission-generated triplets at room temperature, nearly 100 times shorter than the dephasing time we measure for triplets localized on isolated tetracene molecules. These results highlight the importance of morphology and thermal activation in singlet fission systems.

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Name: The journal of physical chemistry letters
ISSN: 1948-7185
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