Progress in Purely Organic Macrocyclic Emitters: From Molecular Architecture to Organic Light‐Emitting Diodes

The rapid advancement of display technology is inseparable from organic light‐emitting diodes (OLEDs). As a critical component of OLEDs, the performance of emissive materials in the emitting layer directly determines their developmental potential. In recent years, macrocyclic luminescent materials have garnered increasing attention due to their distinctive photophysical properties with unique cavities and 3D structures. As nonterminal counterparts of polymers, macrocyclic emitters can synergize with diverse luminescence mechanisms (e.g., fluorescence or thermally activated delayed fluorescence) to achieve highly efficient OLEDs. This review systematically examines recently reported macrocyclic systems, elucidating their emission mechanisms, key factors influencing photophysical and electronic performance, and provides design strategies for macrocyclic emitters.