p-n型有机发光材料的绿色合成及其高效率白光OLED器件

High efficiency, long lifetime and low cost is the driving force for full-scale commerciallization of OLED in large area displays and solid state lighting from the view of materials, making it as the significant research aspects. This project is based on study and development of cost-effective OLED materials, with the aim of preparing high efficiency and long-lifetime single and white light OLED devices. By directly using commercially cheap starting materials, several series of various p-n stuctrured organic electroluminescent host materials and the 3rd gernaration OLED emitting materials are designed and synthesized in a one step reaction. By solving the key issue of the internal relationship between the molecular strucutre of materials and their electronic energy levels, thermal, solid state properties and opto-electronic performance,this project places the emphasis on the blue fluorescent emitting materials which can be simultaneously used as highly efficient organic phosphorescent and/or fluorescent host and novel thermally delayed fluorescent materials,as well as other colored TADF materials, and thus to realize the communal emission of host and guest. Then simple stucture, less materials contained and high efficiency white OLED can be obtained. It is expected to develop a few kinds of cheap but high performance OLED materials with perspective application and our own intellectual property right. Consequently, break the block of excellent OLED materials and device performance from oversea countries to China, and finally promote the development of OLED display and lighting technology.

高效率、长寿命、低成本是从材料的角度推动OLED在平板显示和固态照明领域全面产业化的重要方向。本项目以"开发低成本OLED材料"为基础，"构筑高效率、长寿命单色光及白光OLED器件"为目标。直接采用商业化的廉价原料，只需通过一步绿色化学反应，设计合成各种具有不同p-n结构的有机电致发光材料。围绕"深入探讨材料的分子结构与电子能级、凝聚态结构及光电性能的内在关系"这一关键科学问题，重点发展兼具高效电致发光主体和新型延迟荧光效应的蓝光材料及其它发光颜色的第三代OLED材料，实现主客体材料共同发光，获得器件结构简单、材料种类用量最少的高效率、低成本、光谱稳定型白光OLED器件。开发拥有自主知识产权、具有实用前景的高性能OLED材料及全彩显示和白光照明器件，打破国外对高性能有机发光材料及器件的垄断，推动我国OLED显示及照明技术的发展。

高效率、长寿命、低成本是从材料的角度推动OLED在平板显示和固态照明领域全面产业化的重要研究方向。本项目以“开发低成本OLED 材料”为基础，“构筑高效率、稳定型单色光及白光OLED 器件”为目标。直接采用商业化的廉价原料，通过一步无需催化剂的C-N偶联反应，设计合成各种具有不同D-A结构的有机电致发光材料。围绕“深入探讨材料的分子结构与电子能级、凝聚态结构及光电性能的内在关系”这一关键科学问题，重点发展兼具高效电致发光主体和第三代OLED 发光材料中的热激活延迟荧光（TADF）材料和激基复合物电子受体材料。通过D-A调控，改变D-A单元的结构及比例，结合理论计算，创新性地实现了拉电子诱导效应主导的新型延迟荧光、阐明了延迟荧光的发光机制源于三线态激发态中电子给体至受体的电荷转移跃迁、利用N-异构化发展了高效电子传输材料及激基复合物电子受体材料、首次通过分子内和分子间多重氢键构筑了高效率TADF材料、构筑了纯有机全TADF极简单白光OLED器件。开发了外量子效率接近或大于20%的新型绿光TADF材料5个，蓝光磷光双极主体3个，激基复合物型主体2个。在该项目支持下，基于一步低成本反应发展的新型OLED材料共发表SCI论文17篇，包括Adv. Opt. Mater.2篇，J. Mater. Chem. C 4篇，Chem. Commun.2篇等，授权国家发明专利4项，培养博士生4名，硕士生9名，本科毕业生6名。本项目实现了化学合成最简单的高效率OLED材料，为开发低成本OLED材料及白光照明器件提供技术基础。