Tetrabranched Photo-Crosslinker Enables Micrometer-Scale Patterning of Light-Emitting Super Yellow for High-Resolution OLEDs
- Authors
- Jang, Wooik; Lee, Myeongjae; Kweon, Hyukmin; Park, Hye Won; Yang, Jeehye; Kim, Seunghan; Jo, Hyunwoo; Lee, Chaeyoung; Cho, Jeong Ho; Kwak, Kyungwon; Kim, Do Hwan; Kim, BongSoo; Kang, Moon Sung
- Issue Date
- 18-8월-2021
- Publisher
- AMER CHEMICAL SOC
- Keywords
- azide; high-resolution organic light-emitting diodes; light-emitting polymer semiconductors; photopatterning; tetrabranched photo-crosslinker
- Citation
- ACS PHOTONICS, v.8, no.8, pp.2519 - 2528
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS PHOTONICS
- Volume
- 8
- Number
- 8
- Start Page
- 2519
- End Page
- 2528
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/136837
- DOI
- 10.1021/acsphotonics.1c00768
- ISSN
- 2330-4022
- Abstract
- 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 mu m are formed by using p-xylene as the developing solvent that was carefully selected according to a Hansen solubility parameter analysis.
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