Low-Temperature Cross-Linkable Hole Transport Material Based on Carbazole Derivatives Design and Applications in Solution-Processed OLEDs

• DOI: 10.1021/acs.macromol.4c00227
• Publication Date: 2024-04-16T20:14:20Z
• Authors: Zhou Zhou; Yupeng Li; Xingxing Tang; Zheng Huang; Pengxiang Wang; Qing Xu; Shanghui Ye; Yonghua Li; Wenyong Lai
• Keywords: Triphenylamine; Carbazole; Moiety; Organic Electronics

Cross-linking is demonstrated to be an effective strategy resolve the interface erosion problem facing solution process technique for large area commercial applications of organic electronics. However, most reported cross-linkable materials require a high temperature over 150 °C, which detrimental device performance. In this study, in situ cross-linking protocol proposed based on triphenylamine/carbazole core linked with hexyl chain and styryl moiety, low down 120 °C achieved first time. The resultant thermally hole transportation molecules TPA-VBCz HTPA-VBCz possess triplet energy levels around 3.0 eV decomposition temperatures 410 °C. solution-processed layer (HTL) cured at 30 min finish net structure. Applications HTL multilayer delayed fluorescent green OLEDs are explored significantly improved current efficiency up 78.3 cd A–1 external quantum 24.6%.