Nanotech News and Headlines

Engineering Interface Polarity via Halide‐Functionalized Self‐Assembled Monolayers for NiO‐Based QLEDs with High External Quantum Efficiency

Researchers introduced halide‑functionalized 2PACz self‑assembled monolayers (SAMs) on Cu‑doped NiO hole‑injection layers, creating a strong interfacial dipole that deepens the valence band and lowers the hole‑injection barrier. The high polarizability of the halide groups enhances van der Waals forces, yielding a dense, trap‑suppressing passivation layer. Devices using I‑2PACz‑modified Cu:NiO achieved a record external quantum efficiency of 26.95% for green QLEDs, with an average of 19.53%, a 3.5‑fold gain over unmodified structures. This demonstrates a viable route to high‑performance inorganic HILs in QLED architecture.