Inkjet‐Printed Micrometer‐Thick Patterned Perovskite Quantum Dot Films for Efficient Blue‐to‐Green Photoconversion

Perovskite materials have attracted great attention as a potential color conversion material in the display field recently. However, preparing a large and thick patterned film remains to be a key challenge. Here, a patterned CsPbBr 3 quantum dot color conversion layer is prepared using the inkjet‐printing and UV‐curing method. The prepared 6 µm film exhibits a uniform morphology without coffee‐ring effect. Green emission is achieved with a brightness of 58 cd m −2 and narrow emission band is achieved using the 345 cd m −2 blue OLED excitation light. Furthermore, only 1.4% of decay in brightness is observed after the film is exposed to ambient environment for 1 month without any protection. Finally, a 6.6 in. active matrix perovskite quantum dot display prototype is demonstrated using the blue OLED backlight with 384 × 300 resolution for the first time.