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Synthesis and Properties of PPVs Derivatives Electroluminescent Polymers

Author: WangHuaLin
Tutor: SunYueMing
School: Southeast University
Course: Materials Physics and Chemistry
Keywords: PPV derivatives The organic electroluminescent Alkoxy substituted Oxadiazole
CLC: TB34
Type: Master's thesis
Year: 2006
Downloads: 340
Quote: 1
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Abstract


Polyphenylene vinylene (PPV) material having a high emission luminance, and the advantages of good air stability and mechanical strength, but there is a poor workability and its device is not easy emitting blue light, and other issues. It does not dissolve in an organic solvent, does not melt below the decomposition temperature. This paper discussed the electroluminescent polymer light-emitting principle and in-depth analysis of the domestic and international organic electroluminescent light emitting polymer polyphenylene especially on the basis of the status quo and development trend of ethylene, focuses on the structure of the PPV derivatives its solubility as well as the electroluminescent characteristics of the relationship. Synthesis of alkoxy substituted PPV derivatives containing oxadiazole and the main chain, a detailed study of a variety of monomer and polymer synthesis and characterization of the structure and properties of the system of the polymer main chain, side The composition and structure characteristics of the chain or side groups of the polymer soluble, electrically luminescent properties, photoluminescence properties, heat resistance and electrical properties of organic light emitting device. By alkali induced to a halogen condensing legitimate synthetic branched chain containing different alkoxy PPV derivatives Firstly, focus on a branched chain containing a different chain length in the alkoxy substituent PPV derivatives: poly (2 - methoxy -5 - alkoxy) phenylacetylene. The results show that the alkoxy-substituted group introduced a significant improvement in the PPV soluble in general organic solvents such as THF and chloroform, soluble with substituted increased with the increase of the base length. PPV soluble improvement is mainly due to the spatial effect of the free rotation of the carbon - oxygen bond and alkoxy substituents PPV conjugated planar structure distortion or deflection, the macromolecular chains supple improved, promoting the solvent molecules with the interaction between the polymer chain segments and the polymer segment. With the introduction of alkoxy electroluminescent emission spectrum (EL) peak wavelength and photoluminescence spectra (PL) peak wavelength red-shifted from the mother, but increases with the alkoxy steric hindrance and a blue shift. II. Introduced by the Heck reaction is carried out in the PPV backbone structure oxadiazole (OXD) group by the Heck reaction oxadiazol the introduction of different alkoxy-substituted PPV polymer main chain, the resulting polymer in the common solvents such as THF, DMF have a greater solubility. The synthetic polymer has a strong green fluorescence, electroluminescent peak wavelength of the emission spectrum (EL) and photoluminescence (PL) spectrum peak wavelength than that to introduce the blue shift occurs.

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