Low power stretchable active-matrix red, green, blue (RGB) electrochromic device array of poly(3-methylthiophene)/Prussian blue

Dong Sik Kim, Heun Park, Soo Yeong Hong, Junyeong Yun, Geumbee Lee, Jin Ho Lee, Lianfang Sun, Goangseup Zi, Jeong Sook Ha

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)


We report the fabrication of a stretchable array of active-matrix (AM) electrochromic devices (ECDs). The ECD is made of poly(3-methylthiophene) and Prussian blue electrodes with a mixed gel electrolyte of acetonitrile, poly(methyl methacrylate), propylene carbonate, and lithium perchlorate. The ECD displays can express red, green, or blue (RGB) depending on the applied voltage and has a high stability in air. It exhibits low power consumption levels of 331 and 378 μW cm −2 (10 s duration) at −1.0 and 1.0 V, respectively, and a high coloration efficiency of 201.6 cm 2 C −1 at 1.0 V. A 4 × 4 AM ECD array is integrated on a deformable Ecoflex substrate via a dry transfer method using patterned liquid metal interconnections. The display shows a mechanical stability under bending and biaxial stretching by 30%. Finite element method analysis of the strain distribution also confirms that strain is not applied to the ECDs, guaranteeing stable operation of the array under deformation. Furthermore, a stretchable 6 × 6 AM ECD array for higher resolution display also exhibits mechanical stability under 30% biaxial stretching. This work demonstrates the high potential of our stretchable ECD array in low power-consuming displays for stretchable electronics, wearable devices, and electronic skin.

Original languageEnglish
Pages (from-to)300-308
Number of pages9
JournalApplied Surface Science
Publication statusPublished - 2019 Mar 31

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. NRF-2016R1A2A1A05004935 ). This work was also supported by the KU-KIST School Project .

Publisher Copyright:
© 2018 Elsevier B.V.


  • Active-matrix display
  • Electrochromic device
  • Poly(3-methylthiophene)
  • Prussian blue
  • Stretchable electronics

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics
  • General Physics and Astronomy
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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