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Fully Printable and Reconfigurable Hufu-type Electroluminescent Devices for Visualized Encryption.

Ziqing Luo1, Wenfu Chen1, Mengnan Lai1

  • 1College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518055, P. R. China.

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Summary
This summary is machine-generated.

Inspired by ancient Chinese tallies, scientists created reconfigurable electroluminescent devices using a special polymer gel. These stretchable devices can be disassembled and reassembled over 1000 times, enabling new encryption display systems.

Keywords:
conductive adhesiveselectroluminescent devicesprintable electronicsstretchable electronicstransparent electrodes

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Polymer Chemistry

Background:

  • Conventional electroluminescent (EL) devices are typically integral, limiting their reconfigurability and application scope.
  • Ancient Chinese Hufu, a two-part imperial authorization token, provides a conceptual model for modular device design.

Purpose of the Study:

  • To design and fabricate a novel reconfigurable electroluminescent device inspired by the Hufu concept.
  • To develop a stretchable and adhesive polymer gel composite for transparent electrodes in EL devices.
  • To demonstrate the potential of reconfigurable EL devices for applications like encryption and changeable displays.

Main Methods:

  • Separated an integral EL device into two parts: an EL layer (Part A) and a transparent electrode (Part B).
  • Utilized an adhesive and stretchable polymer gel composite as the transparent electrode material.
  • Investigated the performance of the reconfigurable EL devices through repeated disassembly and reassembly tests.
  • Explored the compatibility of the polymer gel precursor ink with various coating and printing technologies.

Main Results:

  • Achieved robust yet reversible contact between the EL layer and transparent electrode using the polymer gel composite.
  • Demonstrated high-performance and stretchable EL devices that maintain ≈81% of initial luminance after 1000 disassembly/reassembly cycles.
  • Confirmed the compatibility of the polymer gel precursor ink with spin-coating, inkjet printing, dispensing, and brush painting.
  • Successfully demonstrated proof-of-concept applications including an EL encrypted password and a content-changeable digital clock.

Conclusions:

  • The Hufu-inspired reconfigurable EL device design, enabled by a novel polymer gel composite, offers high durability and reusability.
  • The developed technology paves the way for advanced encryption display systems and adaptable electronic interfaces.
  • The material's compatibility with diverse printing techniques suggests scalability for future manufacturing.