非平面芴基类延迟荧光材料的设计合成与性质研究

发布时间：2018-10-23 10:27

【摘要】：近年来,随着OLED(Organic Light-Emitting Diode,有机发光二极管)产业化步伐的加快,面板企业纷纷布局OLED产线,相关的研究特别是属于产业链上游的材料研究也成为研发重点。其中,作为下一代发光层材料的TADF(Thermally Activated Delayed Fluorescence,热活化延迟荧光)材料以其易制备、低成本且保持较高发光性能等优势成为研究中的重要部分。作为分子间TADF材料体系的激基复合物型延迟荧光体系以其更易实现较小的单线态和三线态能级差逐渐得到越来越多科研工作者的关注,我们课题组在研究中发现,具有对称氰基取代特点的SFX类材料通过和4,4',4''-三(咔唑-9-基)三苯胺(TCTA)掺杂可以实现激基复合物型的热活化延迟荧光发射。同时,我们也注意到SFX的衍生物已经在光电器件和延迟荧光器件中得到应用和报道。在本文中,我们在保留对称氰基取代特点的基础上,通过变换芴基骨架的位阻基团和构型等因素,研究具有对称氰基取代的非平面芴基结构材料与实现激基复合物型热活化延迟荧光之间的构效关系。首先,我们从具有对称氰基取代芴这一结构单元出发,通过变换芴的9位上不同的空间位阻单元,制备出一系列具备对称氰基特点的位阻型芴基结构化合物。我们通过将其和4,4',4''-三(咔唑-9-基)三苯胺(TCTA)掺杂,对其光物理性质进行系统研究。我们通过研究发现不同的位阻基元对实现激基复合物型热活化延迟荧光有一定的影响规律。其次,我们进一步改变分子骨架结构并设计了三种“H”型分子结构分子,研究分子构型的改变对延迟荧光性质的影响。作为对比,我们又设计制备了单臂取代的对比分子,进一步证明分子骨架(“H”型)对延迟荧光性质的影响作用。最后,考虑到分子间延迟荧光分子和单分子延迟荧光分子在制备有机发光器件时存在的掺杂和主客体体系带来的工艺问题,我们从激基复合物型热活化延迟荧光给受体材料的角度出发,设计和构筑主客体一体化的延迟荧光分子。
[Abstract]:In recent years, with the acceleration of the industrialization of OLED (Organic Light-Emitting Diode, organic light-emitting diodes (OLEDs), the panel enterprises have laid out the OLED production lines, and the related research, especially the research of materials in the upstream of the industrial chain, has also become the focus of research and development. Among them, TADF (Thermally Activated Delayed Fluorescence, thermal activated delayed fluorescence (TADF (Thermally Activated Delayed Fluorescence,), as the next generation luminescent layer material, has become an important part of the research because of its advantages of easy preparation, low cost and high luminescence performance. As an intermolecular TADF material system, the excimer complex type delayed fluorescence system has been paid more and more attention by more and more researchers because of its easy realization of smaller single-line and three-line energy difference. The thermal activation delay fluorescence emission of the exciplex type of SFX materials with symmetric cyano substitutions can be achieved by doping with 4C4C4C4C4-trianiline (carbazolyl) trianiline (TCTA). At the same time, we also note that the derivatives of SFX have been applied and reported in optoelectronic devices and delayed fluorescence devices. In this paper, on the basis of preserving the characteristic of symmetric cyanide substitution, we change the steric resistance group and configuration of fluorene skeleton. The structure-activity relationship between the non-planar fluoresce-based materials with symmetric cyanoyl substitutions and the delayed fluorescence with excimer type thermal activation was studied. Firstly, starting from the symmetric cyano-substituted fluorene structure unit, a series of sterically hindered fluorenyl compounds with symmetric cyanoyl groups were prepared by transforming different steric blocking units of fluorene at the 9 position of fluorene. The photophysical properties of (TCTA) were systematically studied by doping it with 4K4 (carbazolyl) trichloroaniline (TCTA). We found that different steric resistance units have certain influence on the realization of delayed fluorescence of excimer type thermal activation. Secondly, we further change the molecular skeleton structure and design three kinds of "H" type molecular structure molecules to study the influence of the molecular configuration changes on the delayed fluorescence properties. As a contrast, we have designed and prepared one-arm substituted contrast molecules, which further prove the effect of molecular skeleton ("H" type) on the delayed fluorescence properties. Finally, considering the process problems caused by doping and host guest system in the fabrication of organic luminescent devices by intermolecular delayed fluorescence molecules and monolayer delayed fluorescence molecules, We design and construct a host and guest integrated delayed fluorescence molecule from the perspective of the excimer thermal activation delay fluorescence to the receptor material.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN383.1;TN104.3

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