Atomic Layer Deposition Stabilizes Nanocrystals, Enabling Reliably High-Performance Quantum Dot LEDs.

ABSTRACT: Quantum dot light-emitting diodes (QD-LEDs) with stable high efficiencies are crucial for next-generation displays. However, uncontrollable aging, where efficiency initially increases during storage (positive aging) but is entirely lost upon extended aging (negative aging), hinders further device development. It is uncovered that it is chemical changes to nanocrystal (NC)-based electron transport layer (ETL) that give rise to positive aging, their drift in structure and morphology leading to transiently improved charge injection balance. Using grazing-incidence small-angle X-ray scattering, it is found that ZnMgO NCs undergo size-focusing ripening during aging, improving size uniformity and creating a smoother energy landscape. Electron-only device measurements reveal a sevenfold reduction

SUBMITTER: Wan H 

PROVIDER: S-EPMC11923525 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature