Singlet fission in self-assembled PDI nanocrystals

摘要

Upon photoexcitation, self-assembled PDI nanocrystals (S1S0) in the form of rods of 70 nm width and 1 mu m length are subject to a symmetry breaking charge separation (SBCS) as the first step in the singlet fission (SF) sequence. Hereby, the correlated pair of triplet excited states (1)(T1T1) is formed with a quantum yield of 122. Decoherence and triplet diffusion within the nanocrystals affords a long-lived, uncorrelated pair of triplet excited states (T-1 + T-1) with a quantum yield of 24.