闭环三苯胺类双极主体材料的合成及其在有机电致发光中的应用

Organic light-emitting diodes(OLEDs) are considered as next-generation display and lighting technology and are paid widely attention for the greatly potential application。Now, the electrophosphorescence system is highlighted for the possibility of achieving 100% intern quantum efficiency. It is should be noted that the host materials is also vital important and indispensible in phosphorescent luminance system. In order to fabricate the devices with high efficiency, high stability, long life-time and other advantages, the material research still need further progress, especially high efficienct, stable host materials in OLEDs. This project will focus on how to design and use organic sythetic means to prepare ring-closed triphenylamine-based bipolar host materials. The triphenylamine is a good hole-transport material; we will first synthesize the ring-closed rigid triphenylamine structure and then other electron-transport moieties will be introduced to be bipolar materials. The bipolar materials will lead to wider exciton combination zone and the ring-closed struncture will endow the matrials with more stable property, meanwhile, the energy levels of materials will be controlled by choosing different substituents and positions, and the high efficient and stable devices will be achieved eventually. We also expect that the efficacy and life-time of devices will be further improved by tandem OLED structure.

有机电致发光二极管（OLED）被认为是下一代照明和显示的重要技术,因其巨大的潜在应用而受到广泛重视。目前，有机电致磷光发光因能实现100%内量子效率而备受瞩目。在磷光发光体系中，主体材料的作用不可或缺。为配合制备同时具有效率高、稳定性高、寿命长的器件，材料研究仍需进行多方面的深入探索，尤其是对高效率和高稳定性主体材料的研究，仍然是目前有机电致发光研究的热点之一。为此，本项目拟设计和合成含闭环三苯胺结构的双极主体材料。我们将首先通过闭环反应来构筑基本的、具备良好空穴传输性质的闭环三苯胺单元，再将其与不同的电子传输基元连接而形成双极主体材料。双极体系可带来更宽的激子复合区域，闭环结构可增加材料分子的稳定性，而取代基团和位置的不同可用来调节化合物的能级，由此可望被用于制备高效稳定的电致发光器件。并且，我们拟将所研制的新型主体材料应用于级联OLED器件中，以期进一步提高器件的发光效率和工作寿命。

有机发光二极管（OLEDs）的研究在过去三年中发展迅速，其中高效的OLED需要以参杂体系激发磷光分子或者最近兴起的热至延迟荧光分子来实效理论上100%的内量子效率。本研究主要以刚性分子体系为研究对象，从中着重探索了有机发光二极管中主体材料的分子设计与最终性能的关系，并开发出数个高效主体材料使其可以适用于参杂体系。首先我们围绕三苯胺这个基本基元将其刚性化，限制其旋转，通过这样的方法可有效提高分子的热稳定性，并同时利用了三苯胺自身优秀的载流子传输能力。在此分子设计理念下，我们开发了数个优秀的主体材料，同时，因为蓝光主体材料的要求，我们又发现位点控制对能级的有效调控作用，结合上面的工作我们将研究重点转向新位点的开发和利用，从而实现性能和需求的统一。另外，我们在OLED相关领域，比如传输层材料和发光客体材料，也做了相应的探索与尝试，并取得了不错的效果。