A new thermally crosslinkable hole injection material for OLEDs

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• 作者：Wen-Yi Hung ; Chi-Yen Lin ; Tsang-Lung Cheng ; Shih-Wei Yang ; Atul Chaskar ; Gang-Lun Fan ; Ken-Tsung Wong ; Teng-Chih Chao ; Mei-Rurng Tseng
• 关键词：OLEDs ; Hole injection layer ; Thermal crosslink ; Hole mobility
• 刊名：Organic Electronics
• 出版年：2012
• 出版时间：November, 2012
• 年：2012
• 卷：13
• 期：11
• 页码：2508-2515
• 全文大小：800 K

文摘

A new thermal cross-linkable hole injection monomer VB-DATA derived from famous m-MTDATA as core peripherally functionalized with styryl (vinylbenzene) moiety as polymerizable group has been synthesized and characterized. The propensity of VB-DATA thin films formation is sensitive to the nature of solvent, in which the dichloroethane solution gave smooth polymeric thin films with surface roughness of RMS ¡«0.84 nm by spin-casting followed by thermal treatment at 190 ¡ãC. The introduction of oxygen-linked vinylbenzene group shifted HOMO energy level of VB-DATA to ?5.1 eV along with good nondispersive hole transport property (¦Ì_h ¡« 10^-6 cm² V^-1 s^-1) makes it suitable for serving as HIL on top of ITO electrode. The replacement of PEDOT:PSS by thermally cross-linked VB-DATA films showed comparable OLEDs performance, giving more flexibility on material selection for future OLEDs applications, especially solution-processed ones.