Highly Transparent, Colorless Optical Film with Outstanding Mechanical Strength and Folding Reliability Using Mismatched Charge-Transfer Complex Intensification

Chanjae Ahn, Tae Yong Kim, Pyong Hwa Hong, Sungwon Choi, Yea Jin Lee, Hanui Kwon, Hyeryeon Jeon, Dong Won Ko, In Park, Haksoo Han, Sung Woo Hong

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

The development of flexible displays and electronics is hindered by the disadvantages of polymeric window films, such as low mechanical strength, poor optical properties, and lack of folding and rolling reliability. To overcome these critical limitations, a novel colorless polyimide window film is prepared in this study using the concept of charge-transfer complex (CTC) intensification. The resulting window film has a tensile modulus of 8.4 GPa, total transmittance of ≈90%, and yellow index below 3, which is the best recorded balance between mechanical strength and optical properties for a highly flexible optical film. Unlike commercially available optical-grade engineering plastic films and glass substrates, the prepared window film has both pencil hardness grade over 2H and folding reliability over 200 000 folding/unfolding cycles. These remarkable properties are attributed to the unique supramolecular structure with multiple hydrogen bonding and salt complexation interactions, which exhibits CTC intensification. The CTC intensification mechanism is also proposed in this study.

Original languageEnglish
Article number2111040
JournalAdvanced Functional Materials
Volume32
Issue number20
DOIs
Publication statusPublished - 2022 May 13

Bibliographical note

Publisher Copyright:
© 2022 The Authors. Advanced Functional Materials published by Wiley-VCH GmbH.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • General Chemistry
  • Condensed Matter Physics
  • General Materials Science
  • Electrochemistry
  • Biomaterials

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