Exciton dynamics of a fused ring π-conjugated nonfullerene molecule based on dithienonaphthobisthiadiazole

Herein, we have studied the exciton dynamics of a novel fused ring p-conjugated molecule (YS3) in solution and film states by spectroscopic measurements. This molecule incorporates dithienonaphthobisthiadiazole as a core unit that is a two-dimensionally p-extended fused ring. As a result, we found a long exciton lifetime in YS3 films originating from reduced radiative and nonradiative transitions. This is partly because radiative deactivation is effectively suppressed because of the dipole-forbidden transition in H-aggregates and partly because rotational deactivation is effectively suppressed in the crystalline film state.

Automated summary

In this study, the exciton dynamics of a novel fused ring p-conjugated molecule (YS3) in solution and film states were investigated by spectroscopic measurements. The YS3 films exhibited a long exciton lifetime due to reduced radiative and nonradiative transitions. The suppression of radiative deactivation in H-aggregates and rotational deactivation in the crystalline film state played important roles.