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Macromolecular Research

, Volume 26, Issue 12, pp 1123–1128 | Cite as

Inkjet Printing of SiO2 Hollow Spheres/Polyimide Hybrid Films for Foldable Low-k ILD

  • Min Kyu Kim
  • Sung Hwan Hwang
  • Hyun Sung Jung
  • Tae Sik Oh
  • Jong Hee Kim
  • Ji Beom YooEmail author
Article
  • 164 Downloads

Abstract

We demonstrate inkjet printing as a viable method for flexible interlayer dielectrics (ILDs) films with a low dielectric constant, excellent mechanical characteristics, and thermal properties in foldable organic light emitting diodes (OLEDs). SiO2 hollow spheres (SHSs)/polyimide (PI) hybrid films were printed by SiO2 coated polystyrene (PS) ink and PI ink. The relative permittivity of the hybrid films decreased from 3.45 to 1.87. The thermally stable PI fims maintained their weight below 500 °C from the TGA result. The dielectric constant and current density retained their properties after 50,000 cycles of bending at a 1 mm bend radius. We propose that the inkjet printing of SHSs/PI hybrid films described herein is a promising approach for flexible ILDs in foldable OLEDs.

Keywords

inkjet printing foldable OLEDs interlayer dielectric low-k material polyimide SiO2 hollow sphere 

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Copyright information

© The Polymer Society of Korea and Springer Nature B.V. 2018

Authors and Affiliations

  • Min Kyu Kim
    • 1
  • Sung Hwan Hwang
    • 2
  • Hyun Sung Jung
    • 3
  • Tae Sik Oh
    • 4
  • Jong Hee Kim
    • 5
  • Ji Beom Yoo
    • 1
    • 5
    Email author
  1. 1.SKKU Advanced Institute of Nanotechnology (SAINT) and center for Human Interface Nano Technology (HINT)Sungkyunkwan UniversitySuwonKorea
  2. 2.Department of Materials Science and EngineeringYonsei UniversitySeoulKorea
  3. 3.Nano Convergence Materials CenterKorea Institute of Ceramic Engineering and Technology (KICET)JinjuKorea
  4. 4.School of Mechanical and ICT Convergence EngineeringSunmoon UniversityAsanKorea
  5. 5.School of Advanced Materials Science & EngineeringSungkyunkwan UniversitySuwonKorea

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