π-conjugated diradicals can possess unique luminescence properties if their zwitterionic states are harnessed. Crucially, if S0 and T1 form a quasidegenerate ground state, then the first excited state of such a system is a singlet. This, in turn, can be used to reduce triplet loss channels. The full story here:
Near-infrared luminescent open-shell π-conjugated systems with a bright lowest-energy zwitterionic singlet excited state, which just appeared in Science Advances.
