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Performance Regulation and Application Evaluation of Colorless Polyimide for Flexible Displays.

Han Zhang1, Longlong Chen2, Hanshen Xin1

  • 1School of Microelectronics, Shanghai University, Shanghai 201800, China.

ACS Applied Materials & Interfaces
|March 5, 2025
PubMed
Summary

Researchers enhanced colorless polyimide films for flexible displays by optimizing fluorine monomer ratios and annealing. These improved films exhibit excellent mechanical properties and reliability for advanced display applications.

Keywords:
coefficient of thermal expansioncolorless polyimideflexible displayfolding reliabilityperformance regulation

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Area of Science:

  • Materials Science
  • Polymer Chemistry

Background:

  • Flexible display technology requires substrates with high glass transition temperature, optical transparency, mechanical strength, and compatible thermal expansion.
  • Colorless polyimide films are promising substrate candidates but require property optimization.

Purpose of the Study:

  • To enhance the optical, thermal, and mechanical properties of colorless polyimide films.
  • To investigate the impact of fluorine monomer ratios and annealing temperatures on film performance.
  • To assess the reliability of these films for display applications.

Main Methods:

  • Adjusting fluorine monomer ratios in polyimide synthesis.
  • Investigating various post-synthesis annealing temperatures.
  • Depositing buffer layers using chemical vapor deposition.
  • Conducting high-temperature annealing and 200,000 folding tests.

Main Results:

  • Optimized fluorine content and annealing improved optical, thermal, and mechanical properties.
  • High-temperature annealing revealed that extreme coefficients of thermal expansion lead to cracking.
  • Colorless polyimide films demonstrated excellent mechanical durability after 200,000 folding cycles without buffer layer cracks.

Conclusions:

  • Tailoring fluorine monomer ratios and annealing conditions are effective strategies for developing advanced colorless polyimide films.
  • The developed films show high reliability and mechanical robustness, suitable for flexible display substrates.
  • This research offers critical insights for the design of next-generation substrate materials in display technology.