Tetrabranched Photo-Crosslinker Enables Micrometer-Scale Patterning of Light-Emitting Super Yellow for High-Resolution OLEDs

Wooik Jang, Myeongjae Lee, Hyukmin Kweon, Hye Won Park, Jeehye Yang, Seunghan Kim, Hyunwoo Jo, Chaeyoung Lee, Jeong Ho Cho, Kyungwon Kwak, Do Hwan Kim, Bong Soo Kim, Moon Sung Kang

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Development of a simple and effective patterning method applicable to solution-processable organic luminophores over a large area is critical for the cost-effective production of organic light-emitting-diode (OLED) displays. Here, we demonstrate high-resolution patterning of light-emitting polymer active layers using a highly efficient photo-crosslinker (4Bx). The photo-crosslinker is structured in a tetrabranched geometry, wherein a photo-crosslinkable azide moiety is present at each of the four corners of the molecule, and each of these moieties can form a chemical bond with light-emitting polymer semiconductors under UV irradiation. Due to the high crosslinking efficiency of 4Bx, the use of an unprecedentedly small amount of 4Bx (0.1 wt %) allows fully crosslinking light-emitting Super Yellow polymers without degrading their photoluminescence and electroluminescence characteristics. Furthermore, precisely defined photo-crosslinked patterns of Super Yellow with feature sizes of 5 μm are formed by using p-xylene as the developing solvent that was carefully selected according to a Hansen solubility parameter analysis.

Original languageEnglish
Pages (from-to)2519-2528
Number of pages10
JournalACS Photonics
Issue number8
Publication statusPublished - 2021 Aug 18

Bibliographical note

Publisher Copyright:
© 2021 American Chemical Society.


  • azide
  • high-resolution organic light-emitting diodes
  • light-emitting polymer semiconductors
  • photopatterning
  • tetrabranched photo-crosslinker

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biotechnology
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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