具有聚集诱导发光特性的热活化延迟荧光材料的合成及其应用

The organic light-emitting diodes (OLEDs) have challenged the deficiency of low luminous efficiency and serious current roll-off due to the low luminous efficiency and exciton utilization efficiency of the luminescent materials. Therefore, it is of great significance to design and synthesize luminescent materials with novel structures and excellent properties. In this project, three types of luminescent materials incorporating aggregation-induced emission (AIE) character and thermally activated delayed fluorescence (TADF) properties will be synthesized by using 3,5-di(9-carbazolyl)dibenzophenone, 3,5-di(9-carbazolyl) diphenylacrylonitrile and 3,5-di(9-carbazolyl)diphenylethylene as skeletons, acridine, phenothiazine, phenoxazine, carbazole as electron donors , benzophenone, 5,5,10,10-tetraoxide thioxanthen, 10,10-dioxide-9-thioxanthenone and 9,10-anthracenedione as electron accepters, respectively. The steady-state, transient photophysical properties and the relationship between the structures and the luminous properties of these materials will be investigated systematically. Based on it, novel AIE-TADF materials with high solid-state luminous efficiency and high exciton utilization efficiency will be obtained by the modification of their structures. Furthermore, the OLEDs with high luminous efficiency and low efficiency roll-off will be finally constructed using the synthesized materials as light-emitting layers. This project will provide theoretical and experimental basis for design, synthesis and application of novel organic electroluminescent materials.

目前，有机电致发光器件存在发光效率较低，电流效率滚降较严重等问题，其原因是制备器件的发光材料的发光效率和激子利用率低。因此，设计和合成结构新颖和性能优良的发光材料具有重要的意义。本项目拟合成3,5-二(9-咔唑基)二苯甲酮、3,5-二(9-咔唑基)二苯基丙烯腈和3,5-二(9-咔唑基)二苯乙烯为骨架，吖啶、吩噻嗪、吩噁嗪等基团为电子给体，二苯甲酮、5,5,10,10-四氧噻蒽、10,10-二氧-9-噻吨酮、9,10-蒽二酮等基团为电子受体的兼具聚集诱导发光(AIE)和热活化延迟荧光(TADF)性能的材料。研究它们的稳态和瞬态光物理性能；探讨它们的结构与发光行为的关系。在此基础上，通过对它们的结构进行修饰，获得高固态发光效率和高激子利用率的新型AIE-TADF材料，进而构筑发光效率高和电流效率滚降低的有机电致发光器件。本项目的实施可为新型有机电致发光材料的设计、合成和应用提供理论和实验依据。

有机发光二极管（Organic light-emitting diodes，OLEDs）具有分辨率高、视角广、对比度高、消耗低、响应速度快等优点，其作为彩色光源被广泛应用于显示和照明等领域。在过去的30多年以来，OLEDs的制备技术创新和功能材料优化不断激励和推动学术界和产业界的发展。在本项目实施过程中，项目申请人对氰基苯、二苯砜、吡咯并吡咯、苯基乙烯、丙二腈等基团进行结构修饰，设计合成了多种光电性质丰富的新型有机电致发光材料。研究了他们的热稳定性质、电化学性质、稳态和瞬态光物理性能，探讨他们的结构与发光现象之间的关系。在此基础上，以上述发光材料构筑了高效的有机电致发光器件，为高效的新型有机电致发光材料的一般设计提供理论和实验依据。