Large-Scale Synthesis of Perovskite Quantum Dots and Their Application to Inkjet-Printed Highly Stable Microarray

Perovskite quantum dots (PeQDs) with a pure emission and solution-processable path are highly desirable for color conversion materials to achieve full color and high-resolution display. Yet, operational stability and precise deposition methods remain critical factors that limit their applications. Additionally, the traditional high-temperature synthesis suffers from a short reaction time window, making it difficult to realize large-scale synthesis for practical applications. Here, an in situ reacted multiple-anchoring ligands strategy is reported to effectively extend the high-temperature reaction time for synthesizing PeQDs from 5 to 200 s, endowing the large-scale synthesis in a sufficient time window for mass and heat transfer processes. This strategy simultaneously improves the photo-thermal stability of PeQD patterned films. Uniform and high-resolution microarrays are fabricated by inkjet printing through exquisite control of solvent engineering and substrate optimization, exhibiting reversible fluorescence when suffering high temperatures up to 100 °C. This approach enables large-area (10 × 10 cm²) red and green dual-color patterned microarrays, covering a color gamut of 128% NTSC and 96% BT. 2020. These advancements mark a significant step toward scalable, high-performance PeQD displays, highlighting great potential for next-generation display technologies.