Singlet fission has emerged as a promising strategy to avoid the loss of extra energy through
thermalization in solar cells. A family of dimers consisting of nitrogen‐doped pyrene‐fused
acenes that undergo singlet fission with triplet quantum yields as high as 125% are
presented. They provide new perspectives for nitrogenated polycyclic aromatic
hydrocarbons and for the design of new materials for singlet fission.

Singlet fission has emerged as a promising strategy to avoid the loss of extra energy through
thermalization in solar cells. A family of dimers consisting of nitrogen-doped pyrenefused
acenes that undergo singlet fission with triplet quantum yields as high as 125% are
presented. They provide new perspectives for nitrogenated polycyclic aromatic
hydrocarbons and for the design of new materials for singlet fission.