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Ligand-Assisted Direct Photolithography of Perovskite Nanocrystals Encapsulated with Multifunctional Polymer Ligands for Stable, FullColored, High-Resolution Displays

Authors
Ko, JaewanMa, KyungyeonJoung, Joonyoung F.Park, SungnamBang, Joona
Issue Date
10-3월-2021
Publisher
AMER CHEMICAL SOC
Keywords
perovskite nanocrystals; polymer ligands; photolithography; full-colored micropixels
Citation
NANO LETTERS, v.21, no.5, pp.2288 - 2295
Indexed
SCIE
SCOPUS
Journal Title
NANO LETTERS
Volume
21
Number
5
Start Page
2288
End Page
2295
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/128414
DOI
10.1021/acs.nanolett.1c00134
ISSN
1530-6984
Abstract
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 mu m x 40 mu m 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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