Martina Alebardi

Introduction Singlet Fission (SF) is a peculiar photophysical process through which a high energy singlet excited state down converts to give two triplets of roughly half the energy.[1, 2] For SF to take place, the energy of the S1 state should be at least equal to twice the energy of the T1 state: E(S1) ≥ 2E(T1). Through SF, by absorption of a single photon two triplet excitons are produced. As a result, in SF materials the triplet quantum yield may exceed 100% and approach 200%.

1 Introduction Photoacids are molecular species whose excited state is more acidic than their ground state by several orders of magnitude in terms of acid dissociation constants (Ka).

1 Introduction Singlet Fission (SF) is the photophysical phenomenon through which absorption of a photon by an assembly of two or more chromophores produces a singlet exciton (S1) that is energetically down-converted into two triplet excitons (T1).[1, 2] SF can occur if the process is energetically favorable: E(S1) ≥ 2E(T1).