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RETURN TO ISSUEPREVSurfaces, Interfaces...Surfaces, Interfaces, and ApplicationsNEXT

Pixelated Microsized Quantum Dot Arrays Using Surface-Tension-Induced Flow

  • Taeyang Han
    Taeyang Han
    Division of Advanced Nuclear Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
    More by Taeyang Han
  • Jaebum Noh
    Jaebum Noh
    Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
    More by Jaebum Noh
  • Moo Hwan Kim
    Moo Hwan Kim
    Division of Advanced Nuclear Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
    Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
    More by Moo Hwan Kim
  • Junsuk Rho*
    Junsuk Rho
    Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
    Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
    POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics, Pohang 37673, Republic of Korea
    *Email: [email protected]
    More by Junsuk Rho
  • , and 
  • HangJin Jo*
    HangJin Jo
    Division of Advanced Nuclear Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
    Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
    *Email: [email protected]
    More by HangJin Jo
Cite this: ACS Appl. Mater. Interfaces 2021, 13, 43, 51718–51725
Publication Date (Web):October 22, 2021
https://doi.org/10.1021/acsami.1c14857
Copyright © 2021 American Chemical Society

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    Abstract

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    Quantum dots (QDs) are semiconducting nanoparticles that exhibit unique fluorescent characteristics when excited by an ultraviolet light source. Owing to their highly saturated emissions, display panels using QDs as pixels have been presented. However, the complications of the nanofabrication procedure limit the industrial application of QDs. This study suggests a method to arrange high-aspect-ratio QD pixels by inducing both Laplace-pressure-driven capillary flow and thermally driven Marangoni flow. The evaporation of colloidal QDs induces a capillary flow that drives the QDs toward the inner tips of V-shaped structures. Additionally, the Marangoni flow arranges the gathered QDs at the tip; thus, they could form a high dune, overcoming the limitations of the existing capillary assembly method using evaporation. Using these phenomena, clover-shaped (assembly of V-shaped edges) templates were made to gather numerous QDs, and the clover with a 30° angle afforded the highest brightness among all the angle structures. Finally, by demonstrating a 100-cm2-sized QD microarray with high uniformity (98.6%), our method shows the feasibility of large-area fabrication, which has extensive application in manufacturing QD displays, anti-counterfeiting labels, and other QD-based optical devices.

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsami.1c14857.

    • Derivation process of the model; schematic diagrams for the model; optical images of the microstructures before and after the hard baking process; schematic diagrams of the surface fabrication process; and optical image of a large QD microarray (PDF)

    • Top-view video of the evaporation of water film on a zigzag-structured surface (AVI)

    • Top-view video of the Marangoni flow inside V shapes (AVI)

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