Excited spices in organic semiconductors generated by photon or electrical excitation can relax to the ground state in radiative or non-radiative manner. The emissive relaxation plays an important role for their applications in light emitting devices, while dark processes are kinetically completion loss channels.
The purpose of this sub-project is to quantitatively investigate the excition dynamic for both the emissive and dark processes. We are using ultrafast absorption and time-resolved photoluminescence spectroscopy techniques to experimentally verify these processes. Specifically, we are interested in organic semicondcutors with photophysical properties such as thermally activated delayed fluorescence, room temperature phosphorescence and/or stimulated emission. We anticipate the understanding of ultrafast exciton dynamics can facilitate the development of optoelectronic devices.
