Positional Isomerism Reveals Intrinsic Decoupling of Structural Relaxation and Vibrational Frequency in MR-TADF Emitters.
The pursuit of high-color-purity organic light-emitting diodes (OLEDs) has spurred the development of multiple resonance (MR) emitters. Yet a long-standing assumption in the field holds that minimizing excited-state structural displacement (ΔQ) is essential for achieving narrow emission bandwidth. Here we challenge thi...