Full-Color Micro-Displays Utilizing High-Stability Pure Red Light Perovskite Quantum Dot Nanopapers

Red perovskite quantum dots are critical for the next generation of micro-LED displays, yet their commercialization is thwarted by poor color purity and operational instability. Here, we report a novel, one-step fabrication of a flexible perovskite quantum dot nanopaper (PQDnP) that overcomes these challenges through a synergistic, multi-scale stabilization mechanism. We replace conventional surface ligands with a dual-component system: a sustainable cellulose nanocrystal matrix acts as a robust, thermally insulating scaffold, while a phenethylamine cation provides atomic-level surface passivation and induces the formation of a protective quasi-2D perovskite shell. This hierarchical design yields pure-red PQDnPs with a stable photoluminescence (PL) at 621 nm and a ultra-narrow spectral linewidth of less than 30 nm. The resulting nanopaper demonstrates outstanding robustness, including superior thermal stability and excellent photostability, retaining 74% of its PL intensity after 24 h under harsh blue-light irradiation (150 mW/cm²). By integrating the PQDnP as a color converter with a vertically stacked blue/green μ-LED array, we demonstrate a white-light device with a high system external quantum efficiency of 4.5% and a high peak luminance of over 26,000 cd/m². This bio-inspired, scalable approach provides a practical solution to the persistent “red gap” problem, paving the way for high-fidelity perovskite-based micro-displays. © 2026 Wiley-VCH GmbH.