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Three-Dimensionally Printed, Vertical Full-Color Display Pixels for Multiplexed Anticounterfeiting.

Shiqi Hu1, Xiao Huan1, Jihyuk Yang1

  • 1Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong 999077, China.

Nano Letters
|October 23, 2023
PubMed
Summary

Researchers developed vertically stacked, luminescent heterojunction micropixels using 3D microprinting for high-resolution, multiplexed anticounterfeiting labels. This advancement enhances information encryption and offers a platform for 3D display devices.

Keywords:
3D printingcolor synthesisinformation encryptionmultisegmented pixelsvertical stacking

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Traditional fluorescent security patterns use lateral subpixel configurations, limiting resolution and security.
  • Existing methods face challenges in achieving high pixel density and advanced anticounterfeiting capabilities.

Purpose of the Study:

  • To develop high-resolution, multiplexed anticounterfeiting labels using vertically stacked luminescent micropixels.
  • To enable full-color synthesis and trichannel multiplexed security features through 3D microfabrication.

Main Methods:

  • Utilizing meniscus-guided three-dimensional (3D) microprinting of red, green, and blue (RGB) dye-doped materials.
  • Achieving high-precision vertical stacking of subpixel segments to create full-color micropixels.
  • Modulating the lengths of RGB subpixels for individual pixel color synthesis.

Main Results:

  • Demonstrated vertically stacked luminescent heterojunction micropixels with a pixel size of ~μm and density over 13,000 pixels per inch.
  • Successfully created full-color pixels without sacrificing lateral resolution.
  • Implemented trichannel multiplexed anticounterfeiting Quick Response (QR) codes utilizing the 3D structural designs.

Conclusions:

  • The developed 3D microprinting technique enables high-density, high-resolution anticounterfeiting labels.
  • This technology advances data encryption strategies and offers a versatile platform for 3D display applications.
  • Vertical stacking of luminescent micropixels overcomes limitations of traditional lateral configurations for enhanced security.