Pixelated quantum-dot superlattice LEDs.
basic_science · Level V
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- Record sourced from PubMed, PMID 41986716.
- Also identified by DOI 10.1038/s41586-026-10392-z.
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Abstract
Quantum dot (QD) superlattices offer collective optoelectronic properties distinct from disordered solids<sup>1-4</sup>, but their integration into high-resolution display devices remains elusive because of difficulties in achieving spatially defined, structurally coherent thin films. Here we report a scalable strategy for fabricating pixelated perovskite QD (PeQD) superlattice thin-film arrays that feature in-plane long-range order, vertical confinement and precise spatial patterning. By engineering rhombic dodecahedral CsPbBr<sub>3</sub> nanocrystals with robust surface termination by a ligand-fluoride co-stabilization approach, we direct the formation of hexagonally close-packed superlattice films using capillary liquid-bridge confined assembly. These superlattice films exhibit reduced energetic disorder and enhanced electronic coupling. When integrated into light-emitting diodes (LEDs), the electrically driven PeQD superlattices yield an external quantum efficiency of 30.9%, high luminance of 117,144 cd m<sup>-2</sup> and pixel densities of up to 5,080 pixels per inch. The devices show an extrapolated operational half-lifetime (T<sub>50</sub>) of 12,411 h at 100 cd m<sup>-2</sup>-more than 1,000-fold longer than previously reported pixelated PeQD LEDs. Moreover, we demonstrate the direct integration of patterned superlattices onto a commercial thin-film transistor backplane to construct a 1.85-inch active-matrix display with full greyscale control and video playback ability. These results establish colloidal QD superlattices as a viable material platform for next-generation high-resolution, stable and efficient perovskite displays.