Tuning spin dynamics in crystalline tetracene

Bayliss, S. L. , Kraffert, F., Wang, R., Zhang, C., Bittl, R. and Behrends, J. (2019) Tuning spin dynamics in crystalline tetracene. Journal of Physical Chemistry Letters, 10(8), pp. 1908-1913. (doi: 10.1021/acs.jpclett.9b00356) (PMID:30939019)

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Tetracene is an 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. Upon 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 that we measure for triplets localized on isolated tetracene molecules. These results highlight the importance of morphology and thermal activation in singlet fission systems.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Bayliss, Dr Sam
Authors: Bayliss, S. L., Kraffert, F., Wang, R., Zhang, C., Bittl, R., and Behrends, J.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Journal of Physical Chemistry Letters
Publisher:American Chemical Society
ISSN (Online):1948-7185
Published Online:02 April 2019

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