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The pyrene functionalized photoelectric materials design , synthesis and application

Author: LiuFeng
Tutor: WeiZuo
School: Fudan University
Course: Polymer Chemistry and Physics
Keywords: Organic Photoelectric Functional Materials Polyfluorene Pyrene The 9,9 - diarylpyrazole fluorene Spirofluorene Stellate macromolecules Quantum chemistry Electronic structure
CLC: O621.3
Type: Master's thesis
Year: 2008
Downloads: 382
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Abstract

With the advances in information technology, people have become increasingly demanding display terminal. Flat panel displays and flexible displays become the inevitable outcome of the development of the times. Beginning in the 1990s, the rapid development of organic optoelectronic materials and devices conform to the requirements of the development of information display. Organic flat panel display with its thin, fast response, low power consumption, wide viewing angle, can achieve flexible screen and other features are subject to the attention of the scientific community and the business community. In subsequent decades of development, these two aspects of the materials and devices by leaps and bounds. Devices, the progress of the multilayer device, a spin coating device, the electrode improved greatly improves the efficiency. From the material sense, the various functions of the small molecule materials, polymeric materials are constantly being reported, a gradually increase in performance, and the relationship between structure and function are also gradually built up. Organic photovoltaic technology is a foundation of applied science, committed to developing the use of material and devices, through nearly 30 years of development, the scientists have accumulated a lot of experience of the relationship between material structure and properties of conjugated greatly enriched the connotation and extension of the organic semiconductor. The device technology, many important technologies have also been developed, such as the electrode interface works cathode technologies such as spin coating. This thesis is to investigate the structure and function of the material information from the point of view of materials chemistry. The main object of study for the wide band gap organic semiconductor. Fluorenyl-based material is in the wide band-gap light emitting material, the highlights of the star structure, and they are small molecules and polymers have a very high thermal stability and the fluorescence quantum efficiency. Fluorene oligofluorene and have a good solubility and film-forming polymer, can be prepared by spin coating and inkjet printing device. Fluorene has a number of characteristics modified functional structure can be modified to a different location. The same time, it can be copolymerized, and a variety of monomers to regulate the material's electronic structure. The reference fluorene structure Another important monomer pyrene unit. Pyrene molecule as a fused ring, high fluorescence quantum efficiency and dark blue light emission, there is a wide range of biological applications. From the device perspective, it is possible to improve the performance of the migration rate of the material and the hole injection. Pyrene These properties make them promising optoelectronic materials, and related research. Anthracene and pyrene fellow molecules in optoelectronic materials very much. In this article, we will pyrene as a functional unit to build a new photovoltaic materials. This thesis three-pyrene functionalized fluorene series photoelectric material, detailed characterization of the physical and chemical properties, electronic structure and light emitting devices. The first chapter, we reviewed from the point of view of material structure and properties of linear polyfluorene and fluorene copolymer, hyperbranched polyfluorene of dendritic and stellate macromolecules, deposition of small molecules and spin coating small molecule electroluminescent light-emitting material progress, compare the unique characteristics of each of these different types of materials, and preliminary summary of the relationship of structure and performance. From literature research, we summed up the law of the material design of optoelectronic materials worth studying in several directions, and proposed the design ideas and research contents of this paper. In the second chapter, we summarize this thesis, so the use of a variety of characterization methods. First, we summarize the various chemicals used in the synthesis of materials and related characterization methods. Secondly, we introduce some of the contents of the device fabrication. Finally, we have summarized some of the basic theory used in this article to quantum chemistry. In the third chapter, we study a the pyrene functionalized spiro molecules photoelectric performance. 9,9 - spiro bis Wat photoelectric material in the star molecules, they have a good thermal stability and morphology stability, is widely used in the light emitting material. We first examined the development of a method of preparation of a novel xanthene spiro ring. Then we expand this method, the functional monomer prepared by a series of xanthene structure, conducive to the modification of the the pyrene function unit, preparing a photoelectric material. Last us through the synthesis prepared a different size fused ring spirofluorene of, pyrene functionalized prepared photoelectric material, and study of Spiro size of the photoelectric properties of the material. The Chapter pyrene modified 9 fluorene prepared pyrene-modified 9,9 - diarylfluorene. Then modified by pyrene 9,9 - 2,7 bit diarylfluorene preparation of the Blu-ray functional materials. When the molecules in the solution in 2,7-position of the fluorene introduced pyrene alkynyl thus obtained was blue, the film state was green emission. The special properties of such molecules in that they can be prepared by spin coating the photovoltaic device, which is a very interesting research directions. In 2006, DuPont reported a spin-coating them in small molecule outstanding technical progress, as an important step forward in the field of optoelectronics. But the technical details are secret, we design small molecules spin-coating material a preliminary study on the relationship between structure and spin coating performance, I hope to make some contribution to the progress of the technology. The Chapter conducive pyrene as a stellate molecular core, synthesized a series of four to replace stellate oligofluorenes. The stellate conjugated molecules is a new bright spot in optoelectronic materials in recent years, a considerable number of molecules been reported. But the relationship of structure and performance study is relatively small, preliminary study on the relationship between structure and performance In addition to the study of the photoelectric performance. Through quantitative means to study the electronic structure of its comparative structure characteristics. Then we studied by quantitative means of a series of different substituted pyrene nuclear stellate molecular electronic structure characteristics, screening useful photoelectric molecules.

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