Suppressing nonradiative decay <i>via</i> molecular configuration control in Cu( <scp>i</scp> )–halide clusters enables the fabrication of highly efficient green and green-sensitized blue OLEDs

-DABNA, achieving high-efficiency green-sensitized blue OLEDs with a maximum EQE of 28.7% and Commission Internationale de l'Eclairage (CIE) coordinates of (0.15, 0.19). As either a green dopant or a sensitizer, the device performance ranks among the best reported for copper(i)-based OLEDs. The current study presents promising molecular design and sensitization strategies to address the key challenges in developing high-performance copper(i)-based OLEDs.