High-resolution patterning of colloidal quantum dots via non-destructive, light-driven ligand crosslinking

Jeehye Yang, Donghyo Hahm, Kyunghwan Kim, Seunghyun Rhee, Myeongjae Lee, Seunghan Kim, Jun Hyuk Chang, Hye Won Park, Jaehoon Lim, Minkyoung Lee, Hyeokjun Kim, Joohee Bang, Hyungju Ahn, Jeong Ho Cho, Jeonghun Kwak, BongSoo Kim, Changhee Lee, Wan Ki Bae () and Moon Sung Kang ()
Additional contact information
Jeehye Yang: Sogang University
Donghyo Hahm: Sungkyunkwan University (SKKU)
Kyunghwan Kim: Seoul National University
Seunghyun Rhee: Seoul National University
Myeongjae Lee: Korea University
Seunghan Kim: Sogang University
Jun Hyuk Chang: Sungkyunkwan University (SKKU)
Hye Won Park: Sogang University
Jaehoon Lim: Center for Artificial Atoms, Sungkyunkwan University (SKKU)
Minkyoung Lee: Sogang University
Hyeokjun Kim: Sogang University
Joohee Bang: POSTECH
Hyungju Ahn: POSTECH
Jeong Ho Cho: Yonsei University
Jeonghun Kwak: Seoul National University
BongSoo Kim: Ulsan National Institute of Science and Technology (UNIST)
Changhee Lee: Seoul National University
Wan Ki Bae: Sungkyunkwan University (SKKU)
Moon Sung Kang: Sogang University

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Establishing multi-colour patterning technology for colloidal quantum dots is critical for realising high-resolution displays based on the material. Here, we report a solution-based processing method to form patterns of quantum dots using a light-driven ligand crosslinker, ethane-1,2-diyl bis(4-azido-2,3,5,6-tetrafluorobenzoate). The crosslinker with two azide end groups can interlock the ligands of neighbouring quantum dots upon exposure to UV, yielding chemically robust quantum dot films. Exploiting the light-driven crosslinking process, different colour CdSe-based core-shell quantum dots can be photo-patterned; quantum dot patterns of red, green and blue primary colours with a sub-pixel size of 4 μm × 16 μm, corresponding to a resolution of >1400 pixels per inch, are demonstrated. The process is non-destructive, such that photoluminescence and electroluminescence characteristics of quantum dot films are preserved after crosslinking. We demonstrate that red crosslinked quantum dot light-emitting diodes exhibiting an external quantum efficiency as high as 14.6% can be obtained.

Date: 2020
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DOI: 10.1038/s41467-020-16652-4

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