Carbonyl-Locking Strategy for Multi-Resonance Emitters Enables Efficient Pure-Green OLEDs With Ultralow Efficiency Roll-Off.
Developing multi-resonance thermally activated delayed fluorescence (MR-TADF) emitters that simultaneously achieve bathochromic tuning, narrowband emission, and rapid reverse intersystem crossing (RISC) remains a great challenge for high-performance organic light-emitting diodes (OLEDs). Herein, carbonyl units are fuse...