含离子型铱配合物的白色磷光超分子聚合物的合成及其性能研究

White organic/polymer light-emitting diodes have attracted a lot of attention recently for their potential use in illumination and backlight for flat-panel display. Researches show that supramolecular polymer displayed potential application in optoelectronic device, which combining the advantages of small molecules with those of polymers and overcoming the defects of them. Therefore, this project intends to design and synthesize the supramolecular phosphorescent polymers based on the host-guest interactions between dibenzo-24-crown-8 (DB24C8) and dibenzylammonium (DBA). The orange or blue emitting charged iridium complexes were modified by DB24C8 and the host materials with higher triplet energy were modified by DBA, then the monomers self-assemble into a supramolecular polymer at high concentration. Keeping the mole ratio of 1:1 between the monomers of DB24C8 and DBA, we will obtain a series of solution-processable white phosphorescent supramolecular polymers while changing the relative proportion between the orange and blue emitting iridium complexes. Then, high-efficient white organic light-emitting diodes (WOLED) will be obtained based on these supramolecular polymers. The influence of the supramolecular polymer structure on device performance will be investigated. The light-emitting and energy transfer mechanisms of the supramolecular polymer electroluminescent devices will also be discussed. This project presents a new effective approach for designing of solution-processable white light-emitting materials, and will have a positive effect in applying organic light-emitting diodes into solid state lighting.

白光有机电致发光器件在照明和平板显示背光源等方面具有良好的应用前景，近年来吸引了广大研究者的关注。超分子聚合物发光材料兼备有机小分子和传统聚合物发光材料的优点，克服了它们的缺陷，在电致发光器件上具有潜在的应用价值。基于此，本项目拟合成含双苯并-24-冠-8 (DB24C8) 单元的新型橙黄光离子型铱配合物和蓝光离子型铱配合物，以及含二级铵盐 (DBA) 单元的高三线态主体材料；利用DB24C8与DBA间强的超分子相互作用，自组装形成超分子聚合物。保持DB24C8与DBA的摩尔比为1:1，精确调控橙黄光与蓝光铱配合物的比例，获得一系列可溶液加工的白色磷光超分子聚合物，并制作成高效的白光器件。研究超分子聚合物结构对器件性能的影响；探讨超分子聚合物电致发光器件的发光机理和能量转移机制。本项目提出了一种新颖的制备可溶液加工白光材料的有效方法，并将为有机电致发光器件在固态照明中的应用起到积极作用。

白光有机/聚合物电致发光器件在照明和平板显示背光源等方面具有良好的应用前景，近年来吸引了广大研究者的关注。超分子聚合物发光材料兼备有机小分子和传统聚合物发光材料的优点，克服了它们的缺陷，在电致发光器件上具有潜在的应用价值。基于此，本项目合成了含双苯并-24-冠-8（DB24C8）单元的新型橙黄光铱配合物和蓝光铱配合物，以及含二级铵盐（DBA）单元的高三线态主体材料；利用DB24C8与DBA之间强的超分子相互作用，自组装形成超分子聚合物。保持DB24C8单元与DBA单元的摩尔比为1:1，通过精确调控橙黄光铱配合物与蓝光铱配合物的比例，获得了一系列可溶液加工的白色磷光超分子聚合物，并制作成高效的白光电致发光器件。当黄光铱配合物掺杂比例为1%时，器件性能最好，最大流明效率达到3.91 cd A−1；当黄光铱配合物的掺杂比例为0.4%时，发光颜色最接近纯白光，其色坐标为（0.31, 0.39），器件效率为1.86 cd A−1。本项目提出了一种新颖的制备可溶液加工白光材料的有效方法，并将为有机电致发光器件在固态照明中的应用起到积极作用。