Boosting the Operational Stability of Near-Infrared Perovskite LEDs Utilizing a Zinc Ion-Chelated Hybrid Electron-Transport Layer: The Critical Role of Interfacial Reactions

• • The Zn2+-chelated hybrid ETL reduces oxygen defects and surface hydroxyl groups, leading to a peak EQE of 20.1% and a radiance of 652 W sr-1 m-2, outperforming conventional ZnO NC-based devices. • • Devices with the hybrid ETL achieve a T50 lifetime of 270.7 hours at 100 mA cm-2, over five times longer than conventional ETL devices, addressing the critical bottleneck of operational stability in NIR-PeLEDs. • • The hybrid ETL promotes perovskite crystallization and suppresses deprotonation of organic cations, directly mitigating interface-induced degradation mechanisms. • • The strategy is broadly applicable to other perovskite optoelectronics suffering from interfacial instability, offering a pathway to extend device operational lifetimes.