基于硼配位四氮杂卟啉高效有机热激活延迟荧光材料的设计、合成及器件研究

Organic light emitting diodes (OLEDs) have the great potential in the application of display and lighting. The thermally activated delayed fluorescence (TADF) emitters, the third generation emitter, attracted much attention due to both high efficiency and excellent stability. In this project, boron coordination four aza porphyrin was used as the core of the TADF molecules due to the resonance effect of B and N. High efficiency TADF emitters with small singlet-triplet energy gap can be developed vias tuning the electron donating/accepting ability of the substituent groups. The emission of the TADF emitters can also be tuned by the electron donating/accepting ability of the substituent groups. The relationship of the molecular structure and photophysical properties was investigated by the steady-state and transient spectrum study. High efficiency OLEDs was constructed by the optimization of the device structure. This will be beneficial to the design of the TADF emitters with high efficiency, facilitating the application of OLEDs in display and lightings.

有机电致发光材料在显示和固体照明领域具有巨大的应用前景，第三代发光材料热激活延迟荧光材料(TADF)兼具高效率和高稳定，受到了人们的广泛关注。本项目拟以硼配位四氮杂卟啉作为核，利用硼原子和氮原子的共振效应及周围取代位点取代基给/吸电子能力及空间位阻效应，获得高发光效率和小的单线态-三线态能隙的TADF发光材料；通过取代基给/吸电子能力的调控，实现材料发光颜色的调控。利用稳态/瞬态光物理手段，研究材料结构与其光物理特性的相关性；通过器件结构的设计及优化，获得性能优异的有机电致发光器件（OLEDs）。为更设计高效TADF材料提供必要的理论指导，为OLED器件在显示和照明领域的应用奠定基础。

有机发光材料在显示和固体照明领域具有巨大的应用前景，第三代发光材料热激活延迟荧光材料(TADF)兼具高效率和高稳定，受到了人们的广泛关注。现有材料的器件性能和寿命还不理想，制约了其在oled方面的应用。本项目围绕高效热激活延迟荧光材料的设计与器件应用开展研究，重点围绕类次酞菁的多环硼硫、硼氧及硼硫氧结构和硫杂蒽酮结构的受体单元，通过引入不同的给体单元，给体数目，及不同取代基位置，获得了一系列TADF发光材料。该类材料具有良好的热稳定性，ΔEST小于0.2 eV。蓝光器件的EQE达到22%，绿光器件的EQE可以达到26%。阐明了该类材料的构效关系，光物理性质调控机制，提出设计窄带隙多重共振B类发光材料的新设思路。依托本项目已发表文章18篇（其中SCI论文16篇），待发表文章2篇，申请/授权中国发明专利6项；培养博士研究生4名，培养硕士研究生1名。另有一名博士研究生，将于2022年5月毕业答辩。