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High-efficiency and high-resolution patterned quantum dot light emitting diodes by electrohydrodynamic printing.

Haowei Wang1, Yuanming Zhang1, Yang Liu1

  • 1BOE Technology Group Co., Ltd. No. 9 Dize Road Beijing 100176 China chenzhuo_cto@boe.com.cn.

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|February 17, 2023
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Electrohydrodynamic (EHD) printing enables super-fine quantum dot light-emitting diode (QLED) fabrication, achieving 500 ppi resolution for high-performance displays. This advanced printing method surpasses inkjet limitations for next-generation electronics.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrical Engineering

Background:

  • Quantum dot light-emitting diodes (QLEDs) are crucial for high-definition displays.
  • Current inkjet printing methods face limitations in achieving ultra-high resolutions required for advanced displays.
  • Reducing pixel size is essential for enhancing display resolution and performance.

Purpose of the Study:

  • To introduce and evaluate electrohydrodynamic (EHD) printing as a novel fabrication technique for QLEDs.
  • To demonstrate the capability of EHD printing in achieving significantly higher resolutions than conventional methods.
  • To optimize the EHD printing process for high-efficiency and superfine QLED fabrication.

Main Methods:

  • Utilized electrohydrodynamic (EHD) printing for fabricating pixelated QLEDs.
  • Optimized EHD printing parameters to control droplet size and deposition for high resolution.
  • Designed and fabricated both bottom-emitting and top-emitting QLED devices.
  • Developed a two-color QLED device using the EHD printing strategy.

Main Results:

  • Achieved a high resolution of 500 pixels per inch (ppi), surpassing conventional inkjet printing.
  • Fabricated a bottom-emitting passive matrix QLED with a maximal current efficiency of 14.4 cd A-1 at a 5 μm × 39 μm pixel size.
  • Attained a maximal current efficiency of 16.5 cd A-1 for top-emission passive matrix QLED devices.
  • Successfully fabricated a two-color (red and green) bottom-emission QLED device with 500 ppi.

Conclusions:

  • EHD printing is a viable and superior method for fabricating high-resolution QLEDs.
  • The optimized EHD process enables the creation of high-efficiency QLEDs with superfine pixels.
  • This technology holds significant potential for applications in high-performance displays for mobile and wearable devices.