Unraveling the Room-Temperature Spin Dynamics of Photoexcited Pentacene in Its Lowest Triplet State at Zero Field

Hao Wu, Wern Ng, Shamil Mirkhanov, Arman Amirzhan, Supamas Nitnara, Mark Oxborrow*

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摘要

Photoexcited pentacene, upon arriving via intersystem crossing into its lowest triplet state, has been extensively studied due to the large and relatively long-lived spin polarization that it exhibits. However, the spin dynamics of these triplets has not hitherto been accurately determined, with glaring inconsistencies between published values. Using zero-field transient electron paramagnetic resonance (ZF-trEPR), we here report the determination of a complete set of depopulation and spin-lattice relaxation rates for the lowest triplet state of pentacene doped at 0.1% into a p-terphenyl host crystal at room temperature in zero applied magnetic field. The rates of spin-lattice relaxation between the triplet's sublevels are found to be highly anisotropic (i.e., transition-specific) and not negligible compared to the rates of depopulation from the same three sublevels back to pentacene's ground state. The spin dynamics, as well as the ZF-trEPR technique reported here, can aid the rational, quantitative engineering of applications such as room-temperature masers and triplet dynamic nuclear polarization.

源语言英语
页(从-至)24275-24279
页数5
期刊Journal of Physical Chemistry C
123
39
DOI
出版状态已出版 - 3 10月 2019
已对外发布

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Wu, H., Ng, W., Mirkhanov, S., Amirzhan, A., Nitnara, S., & Oxborrow, M. (2019). Unraveling the Room-Temperature Spin Dynamics of Photoexcited Pentacene in Its Lowest Triplet State at Zero Field. Journal of Physical Chemistry C, 123(39), 24275-24279. https://doi.org/10.1021/acs.jpcc.9b08439