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 degrees C. This approach enables large-area (10 x 10 cm(2)) 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.