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化学进展 2018, Vol. 30 Issue (8): 1202-1221 DOI: 10.7536/PC180128 前一篇   后一篇

• 综述 •

交联型小分子空穴传输材料在溶液工艺制备有机发光二极管中的应用

蔡勤山1,2, 王世荣1,2, 肖殷1,2, 李祥高1,2*   

  1. 1. 天津大学化工学院 天津 300354;
    2. 天津市功能精细化学品技术工程中心 天津 300072
  • 收稿日期:2018-01-29 修回日期:2018-04-21 出版日期:2018-08-15 发布日期:2018-05-16
  • 通讯作者: 李祥高 E-mail:lixianggao@tju.edu.cn
  • 基金资助:
    国家研发计划（No.2016YFB0401303）和天津市自然科学基金项目（No.16JCZDJC37100）资助
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Application of Solution-Processed Multi-Layer Organic Light-Emitting Diodes Based on Cross-Linkable Small Molecular Hole-Transporting Materials

Qinshan Cai1,2, Shirong Wang1,2, Yin Xiao1,2, Xianggao Li1,2*   

  1. 1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300354, China;
    2. Tianjin Engineering Research Center of Functional Fine Chemicals, Tianjin 300072, China
  • Received:2018-01-29 Revised:2018-04-21 Online:2018-08-15 Published:2018-05-16
  • Supported by:
    The work was supported by the National Key R&D Program of China(No. 2016YFB0401303) and the Natural Science Foundation of Tianjin (No. 16JCZDJC37100).
相比蒸镀工艺，溶液工艺制备有机发光二极管（OLEDs）具有材料利用率高、设备要求简单、成本低、可制作大尺寸面板等优点，受到了广泛关注。小分子空穴传输材料是有机发光二极管重要组成部分，起到传输空穴和阻挡电子的作用，在其结构上添加苯乙烯基、氧杂环丁烷等可交联基团，形成适合溶液工艺制备的可交联小分子空穴传输材料，通过热或光的引发形成网络状结构聚合物，进而应用于多层器件结构中，解决层间混溶问题，从而改善器件的效率和稳定性。本文从溶液工艺对材料的要求出发，首先介绍了旋转涂布及喷墨打印工艺的制备方法，评价了不同操作因素对薄膜质量的影响，之后详细介绍各不同交联基团的空穴传输材料，总结并对比各交联基团的优劣，以及对器件性能的影响。最后，展望了可交联空穴传输材料和溶液制备工艺的发展趋势。
关键词： 有机发光二极管, 溶液工艺, 空穴传输材料, 交联, 抗溶剂性
Comparing with vacuum evaporation, fabricating organic light-emitting diodes (OLEDs) by solution-processing methods has plenty of merits, such as high material utilization, simple equipment and feasibility of low cost large size panels, which has drawn much attention. Small molecule hole-transporting materials (HTMs) are an important part of OLED devices for hole transporting and electron blocking. Cross-linking groups such as styryl, oxetane, etc. are added to the structure to form cross-linkable small molecular hole transporting materials, which are suitable for solution-processed technology. Initiating with the thermal or the ultra-violet irradiation cross-linking curing reaction, the polymer network structure is formed. As applied in the multilayer OLEDs, the inducing of cross-linkable hole-transporting materials can solve the miscibility problem of the interlayers between the emitting material layer(EML) and the hole transporting layer(HTL), then improve the efficiency and stability of the device consequently. In this paper, according to the requirements of the solution process for the materials, many techniques about spin-coating and ink-jet printing are presented, such as the methods of fabrication, the quality of films affected by manual factors and the comparison of different manufactory measures. Afterwards, to summarize their performance in devices, various cross-linkable HTMs are listed and investigated, such as trifluoroethylene group, styrene group, oxetane group, siloxane group and unsaturated ester group. Finally, the developing trend of cross-linkable HTMs and solution process is introduced.
Contents
1 Introduction
2 Solution-processed multi-layer organic light-emitting diodes
2.1 Spin-coating process
2.2 Ink-jet printing process
3 Cross-linkable hole-transporting materials
3.1 Trifluoroethylene group
3.2 Styrene group
3.3 Oxetane group
3.4 Siloxane group
3.5 Unsaturated ester group
3.6 Other cross-linking methods
4 Conclusion and outlook
Key words: organic light-emitting diodes, solution-process, hole-transporting materials, cross-link, solution resistance

中图分类号: 

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