A Deep-Blue-Emitting Heteroatom-Doped MR-TADF Nonacene for High-Performance Organic Light-Emitting Diodes**

Subeesh Madayanad Suresh, Le Zhang, David Hall, Changfeng Si, Gaetano Ricci, Tomas Matulaitis, Alexandra M.Z. Slawin, Stuart Warriner, Yoann Olivier, Ifor D.W. Samuel, Eli Zysman-Colman