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

• DOI: 10.1021/acsphotonics.1c00768
• Publication Date: 2021-07-31T14:54:43Z
• Authors: 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; BongSoo Kim; Moon Sung Kang
• Keywords: Moiety

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