Preparation And Photoelectric Properties Of Poly(Phenylene Vinylene) Derivatives With Asymmetric Alkoxyl Substituents/Nanometer Semiconductor Composites

At present, the study of PPV concentrates mainly on the polymer side chain modification, the main chain structure adjustment as well as polymer/inorganic nanocomposites, which can improve solubility and luminescence color of PPV.Five soluble poly(phenylene vinylene) derivatives with asymmetric alkoxyl substituents (ROPPVs) were prepared by dehydrochlorination reaction. The solubility of five materials can be enhanced by introducing the flexible alkoxy groups with different length to the side chain of PPV for modification.Therefore these films can be obtained by spin-coated method, which can simplify technology. Not only PPV luminescence performance can be preserved by asymmetric ROPPVs but also photoluminescence emission wavelength of PPV can be adjusted by decreasing significantly the energy band-gap. On this basis, three soluble poly(phcnylene vinylene) derivatives with asymmetric alkoxyl substituents copolymers were synthesized by copolymerization with different PPV derivatives. The luminescence characteristic and thermal performance of three copolymers were improved by copolymerization.In order to improve the luminescence and thermal performance of asymmetric ROPPVs, a series of poly(phenylene vinylene) derivatives with asymmetric alkoxyl substituents/ nanometer semiconductor composites were synthesized through dehydrochlorination in-situ polymerization. Poly(phenylene vinylene) derivatives with asymmetric alkoxyl substituents/rare earth oxides composites, such as PMOBOPV/EU₂O₃ and PMOCOPV/ (Y₂O₃:Eu³⁺) nanocomposites, PMOCOPV/Eu(phen)₂Cl₃ hybrid materials and PMOCOPV/SWNTs nanocomposites were prepared by the methods that the asymmetric ROPPVs reacted with nanometer rare earth oxide,rare earth complex Eu(phen)₂Cl₃ and purified SWNTs respectively. The results indicate that thermal stability of these composites are improved significantly. At the same time, because various inorganic materials have different effects on polymers, four composites present different photoluminescence emission wavelengths and photoluminescence characteristics. Conclusion suggests that these all provide more advantageous conditions with emitting layers of electroluminescence device.