Synthesis And Optoelectronic Properties Of Luminescent Materials Based On Distyrylbenzene

In recent years, the organic luminescent material is one of the hotspot in the field of organic semiconductor, having been widely studied in organic light emitting diodes, organic solar cells, organic lasers, organic field-effect transistors and so on. According to the difference of carrier transport properties, light-emitting materials are divided into three categories: the electronic transporting light-emitting material, the hole transporting light-emitting material and the bipolar light-emitting material. In 1993, an electroluminescent polymer CN-PPV with high electron-transporting performance was firstly reported.Bipolar organic small molecules have good crystallization performance, being precise to analyze the relationship between molecular structure and luminescent aggregate performance by growing single crystals. A series of bipolar organic small molecules, substituted by CN, are designed and synthesized to research the influence of the molecular structure on the material optical properties in this paper, with the methods of changing substitution position of the cyano group and the donor group at both ends of the molecular structure and controlling intramolecular charge transfer process. Our work includes the following two aspects:1. With the introduction of cyano and triphenylamine groups on both ends of the molecular structure, we design and synthesize α-CN-APV and β-CN-APV molecules, changing the substituted position of CN(α-CN-APV and β-CN-APV) and observing interaction between donor and acceptor. Moreover, we complete a systematic study such as the crystal structure, photophysical properties, thermal properties, electrochemical properties, device performance.2. Fluorine atom owns good performance in carrier transport aspects. By substituting the position of triphenylamine groups with fluorine, we design and synthesize α-F-OPV and β-F-OPV, for the purpose of observing how the changing of the cyano location in molecular structure affects the optical properties. Photophysical properties, thermal properties, the electrochemical properties and other aspects are studied in detail and contrast.