基于非平面刚性骨架的蓝色延迟荧光材料的设计合成及性能研究

热活化延迟荧光（TADF）材料可望替代贵金属磷光材料在有机发光二极管（OLED）中发挥重要作用。能实现稳定高效蓝光OLED的TADF材料的研发，是当前OLED领域极为重要且颇具挑战性的研究课题。本项目将致力于研发基于非平面刚性骨架的新型蓝光TADF材料。利用非平面刚性骨架的结构特点，通过分子结构和激发态调控，提高发光效率和色纯度、缩短发光寿命、提升稳定性和成膜性能，构建综合性能优异的蓝光TADF材料新体系，系统研究其结构、性能及发光机制间的关系。开展该类材料在OLED中的应用研究，揭示器件电光转换的物理过程及老化机制。通过本项目的实施，有望解决TADF蓝光材料在分子设计、性能调控和器件优化方面的一些关键科学问题，开发出若干独具特色并有应用潜力的蓝光TADF材料和器件，获得自主知识产权；并有望获得对材料结构、性能及发光机制间联系的深层次认识，为蓝光TADF材料的设计合成提供理论和技术指导。

Thermally activated delayed fluorescent (TADF) materials have emerged as promising alternatives to phosphorescent materials containing precious metal atoms for the construction of efficient OLEDs. The development of blue-emitting TADF materials that can achieve stable and efficient blue OLEDs represent an extremely important and challenging research topics in the current OLED field. Based on our preliminary results, we propose herein to design blue TADF molecules based on non-planar rigid scaffolds with unique structural characteristics. Various regulation strategies of molecular structure and excited states will be adopted to improve the luminous efficiency and color purity, shorten the emission lifetime, improve stability and film-forming property, and as a result, to obtain novel blue TADF materials with excellent comprehensive properties. We will investigate systematically the inherent relationship between the molecular structure, the luminescent properties, and luminescence mechanism of these materials. Furthermore, blue OLEDs based on these materials will be fabricated, and the electro-optic conversion process and aging mechanism of the devices will be revealed. Through the implementation of this project, it is expected to develop a number of unique blue TADF materials with excellent properties, and to realize low-cost, stable and efficient OLEDs. Besides, the systematical study on the chemical structure, photophysical properties, stabilities and electroluminescence properties of these materials will deepen the understanding of the relationship between structures and properties, and thus provide valuable reference for the design and synthesis of blue TADF materials.