Static vs Herzberg-Teller spin-orbit coupling under symmetry-reducing distortion in multi-resonance TADF emitters.
Multi-resonance thermally activated delayed fluorescence emitters typically rely on rigid, symmetry-defined molecular frameworks to achieve narrowband emission and small singlet-triplet energy gaps (ΔEST), but such symmetry often suppresses static spin-orbit coupling (SOC), making reverse intersystem crossing (RISC) de...