有机单分子白光化合物的可控合成及其双发射光谱的“分子遗传”机制研究

White organic light-emitting diodes (WOLEDs) have broad application prospects in such as display and lighting fields, and thus have been attracted highly attention by the scientists from both academics and industry. Traditional WOLEDs have been fabricated by blending various luminescent materials, which has many disadvantages such as complicated preparation process, high production costs, and easy aging of device caused by phase separation of the luminescent materials during device operation under electricity, heat and light facts. In contrast, the devices with organic single-molecule white-light compounds have many advantages such as higher stability, better repeatability in electroluminescent spectra and easier fabrication of the device and so on. But the controllable synthesis of the organic single-molecule white-light materials is a challenging research topic. The project team have recently found that some thermally activated delayed fluorescence molecules with aggregation-induced emission have a dual-emission "molecular genetic" feature, whereby it has been used to design and synthesize the organic single molecule white-light compounds. On the basis of the above findings, this project will aim to reveal the white-emission mechanism of the organic single molecule white-light compounds and the nature of the dual-emission “molecular genetics” by further molecular structure design and systematic study, as well as to carry out the research on WOLED devices based on the organic single molecule white-light compounds, which will lays a good foundation for the further controllable design and synthesis of the new organic single-molecule white-light materials and devices.

白光有机发光二极管(WOLED)在显示和照明等领域具有广阔的应用前景,因此受到科技界和产业界高度重视。传统WOLED采用多种发光材料复合进行制备，不仅存在制备工艺复杂、生产成本较高等问题，而且发光材料在器件运行过程中容易在电、热和光等作用下发生相分离而使器件性能老化。相比之下，单分子白光材料具有譬如器件稳定性高、光谱重复性好和器件制备工艺简单等优点。但是可控合成单分子白光材料是一个极具挑战性的研究课题。本课题组在最近的研究中发现一些具有聚集诱导发光性能的热激活延迟荧光材料具有双发射发光光谱“分子遗传”特征，据此设计合成出单分子白光化合物。本课题拟在上述发现基础上, 进一步开展分子结构设计，通过深入系统地研究这类单分子白光有机分子的发光机制，揭示这种双发射“分子遗传”本质，同时开展这类单分子白光材料在WOLED器件上的应用研究，为下一步可控设计合成新型单分子白光材料及其器件应用打下良好基础。

可控合成单分子白光材料是一个极具挑战性的研究课题。本课题组在前期的研究中发现一些具有聚集诱导发光性能的热激活延迟荧光材料具有双发射发光光谱“分子遗传”特征，据此设计合成出单分子白光化合物。本课题在上述发现基础上, 进一步开展分子结构设计，通过深入系统地研究这类单分子白光有机分子的发光机制，揭示这种双发射“分子遗传”本质，同时开展这类单分子白光材料在WOLED器件上的应用研究，为下一步可控设计合成新型单分子白光材料及其器件应用打下良好基础。本项目按既定研究计划开展了有机单分子白光化合物的可控合成及其双发射光谱的“分子遗传”机制研究，不仅顺利完成了既定研究目标，并且把研究工作进行了进一步的深化和拓展。到目前为止，已经发表标注期刊论文43篇，其中40篇论文的SCI影响因子大于4。包括在化学领域顶级期刊Angew Chem Int Ed和Chem Sci上分别发表6篇和8篇论文，在功能材料领域顶级期刊Adv Funct Mater上发表1篇论文，在重要Nat Commun上发表1篇论文。并被应邀在化学领域重要综述期刊Chem Soc Rev发表1篇综述。有3篇论文进入ESI高被引论文。期间申请中国专利20件。培养毕业博士生7名，毕业硕士生1名，有5名硕士生进行硕博连读，指导本科生毕业论文10名。项目执行期间，“新型有机发光材料的设计合成及其力刺激发光响应研究”获得2018年度广东省自然科学奖一等奖。综上所述，无论在文章专利等科研方面还是人才培养方面，都超额完成预期目标。四年来项目负责人共参加国际学术会议2次，全国性学术会议6次，均获邀请报告，项目组成员参会人数达20余人。向国内外同行学者介绍了我们的研究成果同时，也使项目组成员获得了许多有益的学术交流。