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, Bong Soo Kim, Changhee Lee, Wan Ki Bae, Moon Sung Kang

Research output: Contribution to journalArticle

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.

Original languageEnglish
Article number2874
JournalNature communications
Volume11
Issue number1
DOIs
Publication statusPublished - 2020 Dec 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Yang, J., Hahm, D., Kim, K., Rhee, S., Lee, M., Kim, S., Chang, J. H., Park, H. W., Lim, J., Lee, M., Kim, H., Bang, J., Ahn, H., Cho, J. H., Kwak, J., Kim, B. S., Lee, C., Bae, W. K., & Kang, M. S. (2020). High-resolution patterning of colloidal quantum dots via non-destructive, light-driven ligand crosslinking. Nature communications, 11(1), [2874]. https://doi.org/10.1038/s41467-020-16652-4