Journal
NATURE COMMUNICATIONS
Volume 11, Issue 1, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-020-16652-4
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Funding
- Basic Science Programme through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT, Korea [NRF-2017R1C1B2006789, 2020R1A2C2011478]
- Creative Materials Discovery Programme through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT, Korea [NRF-2019M3D1A1078299]
- Engineering Research Centre Programme through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT, Korea [NRF-2018R1A5A1025594]
- National Research Foundation of Korea [2020R1A2C2011478] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 mu mx16 mu m, 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. Designing high-resolution displays based on colloidal quantum dots remains a challenge. Here, the authors demonstrate a photo-patterning method to develop CdSe-based core-shell quantum dots patterns of red, green and blue colours with diameters ranging from 7 to 20nm and resolution of 1400 pixels per inch.
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