面向白光照明用氮杂芳环类有机发光材料的化学稳定性和本征衰变机制

项目名称： 面向白光照明用氮杂芳环类有机发光材料的化学稳定性和本征衰变机制

项目编号： No.91233118

项目类型： 重大研究计划

立项/批准年度： 2013

项目学科： 有机高分子材料学科

项目作者： 乔娟

作者单位： 清华大学

项目金额： 80万元

中文摘要： 作为新型固态平面光源，白光OLED要用于照明，必须实现高亮度下的高效率和长寿命。而目前器件在高亮度下寿命都不够，亟待突破。研究发现，材料化学稳定性和衰变行为是导致器件效率下降和寿命不长的本质原因。目前有机发光材料研究通常仅强调高效率，而忽视化学稳定性。本项目面向有机白光照明需求，选择目前重要的一类高效率有机发光材料氮杂芳环类为研究对象，重点研究系列材料化学稳定性和衰变机制。一则采用多种分析手段如激光解离吸附飞行时间质谱（LDI-TOF-MS）、X射线光电子能谱（XPS）等，从三个层次分别研究材料本身、薄膜状态以及相关器件的化学稳定性和衰变行为；二则借助量化计算，揭示材料在光/电作用下的化学衰变机制；最后，研究材料分子结构与化学稳定性之间的关系，以期提出高效且稳定的有机发光材料分子设计策略。项目成果一方面为新型高效稳定光电材料的理性设计提供参考，另一方面可加速高效光电材料从实验室走向应用。

中文关键词： 有机发光器件；有机蓝光材料；化学稳定性；本征衰变机制；氮杂芳环

英文摘要： White organic light-emitting diodes (WOLEDs) have drawn tremendous research interest because of their unique features and potential applications in solid-state lighting. Although the efficiency of WOLEDs has been boosted significantly during the past decades, the device lifetime is still a challenge. It has been recognized that the operational degradation of OLEDs is enslaved to the intrinsic chemical degradation behaviors of used materials. However, up to now, the degradation mechanisms of only few organic materials applied in OLEDs are known. In this project, we focus on the chemical stability and intrinsic degradation mechanism of N-containing heteroaromatic light-emitting materials, which have demonstrated strong potential for application in WOLEDs due to high charge-mobility and high-efficiency. The first is to systematically study the chemical stability of series of N-containing heteroaromatic compounds employing many advanced techniques such as CV, LDI-TOF-MS , XPS and ESI, etc. The second is to investigate the intrinsic degradation mechanism of these compounds with the aid of quantum chemistry calculations. The end is to explore the relationship between the molecular structure and chemical stability, and then design novel materials with both high efficiency and chemical stability, which are highly desira

英文关键词： OLED；blue-emitting materials；chemical stability；intrinsic degradation mechanism；N-containing heteroaromatic