Ultrahigh‐Resolution Full‐Color Quantum Dot LEDs Based on Region‐Selective Interfacial Self‐Assembly

Abstract Colloidal quantum dots (QDs) have shown great promise in the development of high‐resolution displays for near‐eye visual communication with the outside world. However, achieving full‐color high‐precision assembly of QDs at the nanoscale remains a critical challenge. This study proposes a novel strategy for the region‐selective assembly of QDs for achieving ultra‐high‐resolution light‐emitting devices. This approach leverages interface‐assembled ultrathin surface microstructures to create specific wettability patterns, guiding the selective assembly of QDs on their surfaces. Ultimately, an ultra‐high‐resolution 36 599 pixels per inch (PPI) light‐emitting device is successfully realized, with a record‐high external quantum efficiency (EQE) of 18.74%. The addition of a molecular microstructure enhances the fidelity of the assembled QDs pattern, providing nearly a two‐fold increase in contrast ratio while effectively suppressing device leakage current. Additionally, the assembly process is compatible with photo‐crosslinking technology, resulting in a full‐color light‐emitting device with an EQE of 11.01%. Our strategy paves a simple and effective way for advancements in high‐performance nano‐display technology.