Ultrathin Light-Emitting Diodes with External Efficiency over 26% Based on Resurfaced Perovskite Nanocrystals

Light-emitting diodes based on perovskite nanocrystals (PNCs-LEDs) have gained great interest for next-generation display and lighting technologies prized their color purity, high brightness, luminous efficiency which approach the intrinsic limit imposed by light extraction from device structure. Although time is ripe development of effective outcoupling strategies to further boost performance, this technologically relevant aspect PNC-LEDs still without a definitive solution. Here, following theoretical guidelines integration complex photonic structures, we realize stable with external quantum (EQE) as 26.7%. Key such performance channeling recombination zone in PNC emissive layers thin 10 nm, achieve finely balancing charge transport using CsPbBr3 PNCs resurfaced nickel oxide layer. The ultrathin general and, principle, applicable other nanostructures fabricating highly efficient, color-tunable transparent LEDs.