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

Abstract

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 CsPbBr3 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.

Full‐Color Micro‐LED Display with CsPbBr3 Perovskite and CdSe Quantum Dots as Color Conversion Layers

“…In our recent reports, we have shown efficient photoconversion in micrometer‐thick uniform perovskite and inorganic QD films through inkjet printing (IJP) with UV‐induced polymerization or vacuum‐drying approach. [ 24–27 ] Here, by addressing the aforementioned issues, we successfully demonstrate a 4‐in. full‐color prototype based on blue micro‐LED backlight and QD CCLs.…”

In Situ Inkjet Printing Patterned Lead Halide Perovskite Quantum Dot Color Conversion Films by Using Cheap and Eco‐Friendly Aqueous Inks

“…prepared patterned CsPbBr 3 QD CCFs by using the inkjet printing and UV‐light curing. [ 26 ] However, this type of ink has disadvantages of fussy operation and poor stability because PQDs are unstable and have the so‐called “aggregation fluorescence quenching”. Another is “non‐fluorescent” ink, which is produced by dissolving raw materials of PQDs in a solvent to form transparent precursor solutions.…”

Metal Halide Perovskites Functionalized by Patterning Technologies

“…[ 82 ] Duan and co‐workers achieved micrometer‐thick patterned perovskite QD films without coffee ring effect by the combination of inkjet printing and UV‐curing method. [ 83 ] The inks were composed of UV‐curing acrylic resin and a small concentration of solvent. Therefore, during the polymer assembly under UV exposure, the movement of the particles is very slow confined by the polymer network, realizing uniform and low‐roughness films.…”