Dual-Hydrogen-Bonded Interfaces Unlock Record-High Efficiency and Stability in Eco-friendly Copper-Iodide Deep-Blue Light-Emitting Diodes

Eco-friendly deep-blue light-emitting diodes (LEDs) with excellent efficiency and stability represent a critical bottleneck for next-generation displays. Zhu et al., reporting in Nature, present a copper-iodide hybrid emitter achieving record performance via dual interfacial hydrogen-bond passivation. By sandwiching the copper-iodide emissive layer between a self-assembled monolayer and a poly(methyl methacrylate) layer, this approach effectively passivates interfacial defects, facilitates hole injection, and suppresses excess electron transport. The optimized LEDs demonstrate a 12.57% external quantum efficiency, a 3,970 cd m^-2 luminance (CIE: 0.147, 0.091), and a 204-h half-lifetime at 100 cd m^-2, representing a stability improvement exceeding 85-fold over those of perovskite counterparts. This work not only delivers unprecedented efficiency and an operational lifetime for metal halide deep-blue LEDs but also establishes a dual-interfacial-hydrogen-bond-passivation-based design principle for advancing sustainable displays.