Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.020
Publication date: 18th July 2019
Singlet fission (SF) has been extensively studied through the use of magnetic field effects. We studied delayed fluorescence originating from diffusion-mediated reversible geminate fusion of triplets. We extended the Johnson−Merrifield model to study magnetic field effect on delayed fluorescence originating from diffusion-mediated reversible geminate fusion of triplets. We have shown that a wide range of SF materials exhibit power-law asymptotic decay. The asymptotic power law dependence appears after the transit time. The transit time to the asymptotic power law is inversely proportional to the value of the mutual diffusion constant of triplet pairs. The temperature dependence of the asymptotic emission decay supports a mechanism involving delayed fluorescence mediated by diffusion. Moreover, we show that the decay lines at different field strengths will not cross each other when fission occurs effectively. In the opposite limit when fusion occurs effectively the two decay lines will cross each other. We also study the effect of crystal anisotropy on the delayed fluorescence originating from geminate fusion of triplets.
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