Micropatterns with a high stability,
definition, and resolution
are an absolute requirement in advanced display technology. Herein,
patternable perovskite nanocrystals (PNCs) with excellent stability
were prepared by exchanging pristine ligands with multifunctional
polymer ligands, poly(2-cinnamoyloxyethyl methacrylate). The polymer
backbone contains a cinnamoyl group that has been widely employed
as a photo-cross-linker under 365 nm UV irradiation. Also, the terminal
group is readily adjustable among NH3Cl, NH3Br, and NH3I, allowing us to obtain multicolored PNCs
via instant anion exchange. Furthermore, the resulting ligand exchanged
PNCs exhibited enhanced stability toward polar solvents without any
undesirable influence on the structural or optical properties of the
PNCs. Using anion exchanged PNCs, RGB microarrays with a subpixel
size of 10 μm × 40 μm were successfully demonstrated.
Our results highlight the versatility and feasibility of a simplified
patterning strategy for nanomaterials, which can be generally applied
in the fabrication of various optoelectronic devices.
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