A series of soluble poly(p-phenylene vinylene) (PPV) derivatives were synthesized through dehydrochlorination with the p-metaoxy phenol as starting materials. The electronic characteristics of PPV derivatives were stu...A series of soluble poly(p-phenylene vinylene) (PPV) derivatives were synthesized through dehydrochlorination with the p-metaoxy phenol as starting materials. The electronic characteristics of PPV derivatives were studied.展开更多
It was found that traces of water in the reaction medium would result in a great increase of gel and a decrease of Molecular weight of the poly(2-methoxy,5-(2'-ethylhexyloxy)-1,4-phenylene vinylene) during the pol...It was found that traces of water in the reaction medium would result in a great increase of gel and a decrease of Molecular weight of the poly(2-methoxy,5-(2'-ethylhexyloxy)-1,4-phenylene vinylene) during the polymerization, which ultimately led to inferior film qualities and device properties. The device (ITO/PEDOT/MEH-PPV/Ba/Al) with MEH-PPV prepared under dry conditions has an external quantum efficiency of above 2.0%.展开更多
In this study, the conjugated polymer, poly(1-methoxy-4-octyloxy)-para-phenylene vinylene (MO-p-PPV) was synthesized and characterized. MO-p-PPV was synthesized according to Gilch polymerization mechanism by using 4-m...In this study, the conjugated polymer, poly(1-methoxy-4-octyloxy)-para-phenylene vinylene (MO-p-PPV) was synthesized and characterized. MO-p-PPV was synthesized according to Gilch polymerization mechanism by using 4-methoxyphenol as starting material in the presence of potassium tert-butoxide (1M in THF). The product was further purified by multiple precipitations in different solvents such as methanol, tetrahydrofuran, isopropyl alcohol and hexane. The final product was dried to afford MO-p-PPV as a red solid. The resulting polymer was completely soluble in common organic solvents. The structure of monomer and optical properties of polymer were characterized by proton nuclear magnetic resonance (1H-NMR) spectroscopy, UV-vis spectroscopy, and fluorescence spectroscopy. The UV-vis spectrum showed absorption maxima for MO-p-PPV at 491 nm. Similarly, fluorescence spectrum showed λmax emission at 540 nm.展开更多
A new method was developed using ultrasonic irradiation to synthesize poly(2-methoxy-5-butoxy) phenylene vinylene from p-methoxy phenol (MOPh) and CH3 (CH2)3Br. Ultrasonic irradiation catalyzes the reactions through t...A new method was developed using ultrasonic irradiation to synthesize poly(2-methoxy-5-butoxy) phenylene vinylene from p-methoxy phenol (MOPh) and CH3 (CH2)3Br. Ultrasonic irradiation catalyzes the reactions through three major steps of etherification, bischloromethylation and elimination. Results showed that our ultrasonic irradiation method could significantly enhance production yield and reduce process time of the synthesis compared with reflux agitating method.展开更多
This paper reports the synthesis of a water soluble conjugated polymer poly(p-phenylene vinyleneco-sodium methacrylate) (ws-P(PV-co-SMA)) and the multilayer of the derived copolymer assembling poly(diallyl dimethyl am...This paper reports the synthesis of a water soluble conjugated polymer poly(p-phenylene vinyleneco-sodium methacrylate) (ws-P(PV-co-SMA)) and the multilayer of the derived copolymer assembling poly(diallyl dimethyl ammanium chloride) (PDDA). The self-assembling process of the multilayer was monitored by UV-vis absorption spectroscopy, and the data indicated a linear increase in film thick- ness with a number of ws-P(PV-co-SMA)/PDDA bilayers. The alternative deposition of ws-P (PV-co-SMA) and PDDA allowed the insertion of a non-conjugated layer between the conjugated layers, thus the migration of the photogenerated polarons was effectively confined in the isolated ws-P (PV-co-SMA) chains. Consequently, the photoluminescence quantum yield reached 0.68, 30 times higher than that of pure poly(p-phenylen vinylene). The distinct electronic interactions between conjugated segments were confirmed by comparative analyses of the excitation spectra and time-resolved photoluminescence spectra of ws-P(PV-co-SMA) solid film and the assembled multilayers. The confinement effect of the PDDA layer on the photogenerated carriers was verified by the surface photovoltage spectroscopic measurement on both ws-P(PV-co-SMA) solid film and self-assembled multilayers.展开更多
报道了聚苯胺中间氧化态(emeraldine base form PANI-EB)空穴传输层对以PPV衍生物(PTA-PPV,PTA-DMPPV和MEH-PPV)为发光层和Alq3为电子传输层构成的多层结构的发光二极管的影响。实验结果表明,在器件中PANI-EB空穴层的引入能有效地降低...报道了聚苯胺中间氧化态(emeraldine base form PANI-EB)空穴传输层对以PPV衍生物(PTA-PPV,PTA-DMPPV和MEH-PPV)为发光层和Alq3为电子传输层构成的多层结构的发光二极管的影响。实验结果表明,在器件中PANI-EB空穴层的引入能有效地降低器件的启亮电压和提高器件的发光亮度,其影响程度依赖于PPV衍生物的结构。展开更多
文摘A series of soluble poly(p-phenylene vinylene) (PPV) derivatives were synthesized through dehydrochlorination with the p-metaoxy phenol as starting materials. The electronic characteristics of PPV derivatives were studied.
基金This work were supported by the National Natural Science Foundation of China (Project No29992530-6) and the Natural Science Foundation of Guangdong Province (Grant No. 990623).
文摘It was found that traces of water in the reaction medium would result in a great increase of gel and a decrease of Molecular weight of the poly(2-methoxy,5-(2'-ethylhexyloxy)-1,4-phenylene vinylene) during the polymerization, which ultimately led to inferior film qualities and device properties. The device (ITO/PEDOT/MEH-PPV/Ba/Al) with MEH-PPV prepared under dry conditions has an external quantum efficiency of above 2.0%.
文摘In this study, the conjugated polymer, poly(1-methoxy-4-octyloxy)-para-phenylene vinylene (MO-p-PPV) was synthesized and characterized. MO-p-PPV was synthesized according to Gilch polymerization mechanism by using 4-methoxyphenol as starting material in the presence of potassium tert-butoxide (1M in THF). The product was further purified by multiple precipitations in different solvents such as methanol, tetrahydrofuran, isopropyl alcohol and hexane. The final product was dried to afford MO-p-PPV as a red solid. The resulting polymer was completely soluble in common organic solvents. The structure of monomer and optical properties of polymer were characterized by proton nuclear magnetic resonance (1H-NMR) spectroscopy, UV-vis spectroscopy, and fluorescence spectroscopy. The UV-vis spectrum showed absorption maxima for MO-p-PPV at 491 nm. Similarly, fluorescence spectrum showed λmax emission at 540 nm.
文摘A new method was developed using ultrasonic irradiation to synthesize poly(2-methoxy-5-butoxy) phenylene vinylene from p-methoxy phenol (MOPh) and CH3 (CH2)3Br. Ultrasonic irradiation catalyzes the reactions through three major steps of etherification, bischloromethylation and elimination. Results showed that our ultrasonic irradiation method could significantly enhance production yield and reduce process time of the synthesis compared with reflux agitating method.
基金Supported by the National Basic Research Program of China (Grant No. 2007CB 808000)Open Project of State Key Laboratory of Supramolecular Structure and Materials (Grant No. SKLSSM200705)
文摘This paper reports the synthesis of a water soluble conjugated polymer poly(p-phenylene vinyleneco-sodium methacrylate) (ws-P(PV-co-SMA)) and the multilayer of the derived copolymer assembling poly(diallyl dimethyl ammanium chloride) (PDDA). The self-assembling process of the multilayer was monitored by UV-vis absorption spectroscopy, and the data indicated a linear increase in film thick- ness with a number of ws-P(PV-co-SMA)/PDDA bilayers. The alternative deposition of ws-P (PV-co-SMA) and PDDA allowed the insertion of a non-conjugated layer between the conjugated layers, thus the migration of the photogenerated polarons was effectively confined in the isolated ws-P (PV-co-SMA) chains. Consequently, the photoluminescence quantum yield reached 0.68, 30 times higher than that of pure poly(p-phenylen vinylene). The distinct electronic interactions between conjugated segments were confirmed by comparative analyses of the excitation spectra and time-resolved photoluminescence spectra of ws-P(PV-co-SMA) solid film and the assembled multilayers. The confinement effect of the PDDA layer on the photogenerated carriers was verified by the surface photovoltage spectroscopic measurement on both ws-P(PV-co-SMA) solid film and self-assembled multilayers.
文摘报道了聚苯胺中间氧化态(emeraldine base form PANI-EB)空穴传输层对以PPV衍生物(PTA-PPV,PTA-DMPPV和MEH-PPV)为发光层和Alq3为电子传输层构成的多层结构的发光二极管的影响。实验结果表明,在器件中PANI-EB空穴层的引入能有效地降低器件的启亮电压和提高器件的发光亮度,其影响程度依赖于PPV衍生物的结构。
