Inkjet‐printed perovskite quantum dot (PQD) color conversion films (CCFs) have great potentials for mini/micro‐LED displays because of their ultrahigh color purity, tunable emissions, high efficiency, and high‐resolution. However, current PQD inks mainly use expensive, toxic, and flammable organic substances as solvents. In this work, water is proposed to be used as the solvent for inkjet printing PQD/polymer CCFs. The green‐emitting patterned MAPbBr₃/polyvinyl alcohol (PVA) films are in situ prepared by using halides and the PVA‐based aqueous ink. The as‐printed CCFs exhibit a high‐resolution dot matrix of 90 µm with a bright green emission (λ_em = 526 nm), a high photoluminescence quantum yield of 85%, and a narrow full width at half maximum of 22 nm. They have both air‐ and photo‐stabilities under ambient conditions, and each pixel of CCFs is relatively uniform in morphology and fluorescence when the substrate temperature is 80 °C. The patterned blue‐emitting MAPbCl_xBr_3‐x/PVA and red‐emitting Cs_0.3MA_0.7PbBr_xI_3‐x/PVA can also be printed by aqueous inks. These results indicate that the designed aqueous inks are promising for in situ inkjet printing high resolution and reliability PQD CCFs for mini/micro‐LED displays.

中文翻译：

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使用廉价且环保的水性油墨原位喷墨印刷图案化卤化铅钙钛矿量子点颜色转换膜

喷墨打印的钙钛矿量子点 (PQD) 颜色转换膜 (CCF) 因其超高的色纯度、可调谐发射、高效率和高分辨率而在 mini/micro-LED 显示器方面具有巨大潜力。然而，目前的 PQD 墨水主要使用昂贵、有毒、易燃的有机物质作为溶剂。在这项工作中，建议使用水作为喷墨打印 PQD/聚合物 CCF 的溶剂。使用卤化物和 PVA 基水性油墨原位制备绿色发光图案化 MAPbBr ₃ /聚乙烯醇 (PVA) 薄膜。印刷后的 CCF 呈现出 90 µm 的高分辨率点阵，具有明亮的绿色发射 (λ _em = 526 nm），85% 的高光致发光量子产率和 22 nm 的窄半峰全宽。它们在环境条件下具有空气稳定性和光稳定性，当基板温度为 80°C 时，CCF 的每个像素的形态和荧光都相对均匀。图案化的蓝色发光 MAPbCl _x Br _{3- x} /PVA 和红色发光 Cs _0.3 MA _0.7 PbBr _x I _{3- x} /PVA 也可以通过水性油墨印刷。这些结果表明，所设计的水性油墨有望用于原位喷墨打印用于 mini/micro-LED 显示器的高分辨率和可靠性 PQD CCF。