Triton‐X Engineered Hole‐Injection Layer Enabled Efficient Flexible Quantum Dot Light‐Emitting Diodes

Abstract Flexible quantum‐dot light‐emitting diodes (QLEDs) inherit the merits of their rigid counterparts (high color purity, wide gamut, low driving voltage, and high luminance) while adding mechanical bendability, positioning them as a leading candidate for next‐generation displays. Nevertheless, present flexible QLEDs still rely on the layer stack originally optimized for rigid glass substrates. The markedly different interfacial chemistry and mechanical properties of flexible organic substrates lead to poor interfacial compatibility, imbalanced charge injection, and limited resistance to mechanical strain. Here, polyethylene‐glycol octylphenyl ether (Triton‐X) is introduced as a multi‐functional dopant for the organic hole‐injection layer (HIL). The additive self‐assembles into fibrillar conductive networks that simultaneously enhance interfacial wettability, strengthen hole injection, and suppress leakage currents, while endowing the entire multilayer stack with superior mechanical resilience. Consequently, the flexible QLEDs reach a peak external quantum efficiency (EQE) of 21.1% and a current efficiency of 30.7 cd A −1 . Moreover, the Triton‐X behaves as an internal plasticizer, drastically reducing performance degradation during repeated bending at a radius of 5 mm. This single additive thus fulfills three critical roles—interface engineer, charge injector, and mechanical reinforcer—unlocking robust, high‐performance flexible QLEDs.