Boron‐, Sulfur‐ and<scp>Nitrogen‐Doped</scp>Tridecacyclic Aromatic Emitters with Multiple Resonance Effect for Narrowband Red Emission^†

Abstract

Comprehensive Summary Two novel boron (B), sulfur (S), nitrogen (N)‐doped polycyclic aromatic hydrocarbon multiple resonance emitters (DBNS and DBNS‐ t Bu) are designed and synthesized for narrowband red emission by embedding two pairs of S and N atoms and two B atoms in para ‐positions of central benzene rings within a tridecacyclic aromatic skeleton to form donor‐π‐donor (D‐π‐D) and acceptor‐π‐acceptor (A‐π‐A) structures, which not only exhibit emission maximum at 641 nm with small full width at half maximum of 39 nm, but also combine high photoluminescent quantum efficiency (85%) and rapid reverse intersystem crossing ( k RISC = 2.2 × 10 5 s −1 ), giving rise to red electroluminescence with color coordinates of (0.65, 0.34) and maximum external quantum efficiency of 7.8% via solution process.