新型高效非掺杂深蓝热活化延迟荧光材料的设计、合成及其应用研究

Blue light-emitting materials with high efficiency and good color purity play an important role in achieving high-quality white lighting and full color display. But their performance and lifetime are much inferior compared with green and red light-emitting materials. .As the third-generation emitters, thermally activated delayed fluorescence (TADF) materials, have attracted much attention. But strong intramolecular charge transfer states (ICT) between electron donor and acceptor connected directly in the TADF molecules cause an obvious redshift in the emission, which is the greatest challenge for developing pure blue to deep blue TADF materials..In this project, we will regulate the connection mode, binding site and spacing between electron donors and acceptors with different electron pushing and pulling properties, so as to avoid the emission redshift caused by strong ICT effect, and realize the deep blue TADF based on the intramolecular through-space charge transfer state. The relationship of the molecular structure and photophysical properties will be investigated by the steady-state and transient spectroscopy. High efficiency OLEDs will be constructed by the optimization of the device structures. High-performance non-doped deep blue TADF OLEDs are expected to achieve. This will be beneficial to the design of high-efficiency deep blue TADF emitters, which has certain theoretical significance and practical value.

高效且色纯度好的蓝光材料在实现高质量的白光照明和全彩显示中扮演着重要角色，但与绿光和红光材料相比，其发光性能和寿命都逊色很多。.作为第三代电致发光材料，热激活延迟荧光（TADF）材料受到了人们的广泛关注。但其分子中电子受体与电子给体通常直接相连，形成强的分子内电荷转移态（ICT），会引起发射光谱发生明显红移，是研发深蓝TADF材料的最大挑战。.本项目拟调控不同给/吸电子性能的电子给体和受体之间的连接方式、结合位点和间距等，避免强的ICT效应引起的发射光谱红移，获得基于分子内空间电荷转移态的高效深蓝TADF材料；利用稳态/瞬态光物理手段，系统研究材料的结构与其光物理特性之间的构效关系；通过器件结构的设计及优化，实现性能优异的非掺杂深蓝有机电致发光器件；为设计高效深蓝TADF材料提供必要的理论指导，同时又具有一定的实用价值！

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