Synthesis and characterization of conjugated copolymers containing different chromophores in the main chain
碩士 === 國立中正大學 === 化學工程研究所 === 92 === A series of novel light-emitting copolymers having well-defined conjugation lengths and different chromophores have been synthesized. The solubility and the optical and electrochemical properties were investigated, and the effects of introducing nonlinear thiophe...
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ndltd-TW-092CCU000630342015-10-13T13:39:29Z http://ndltd.ncl.edu.tw/handle/22026974797165702355 Synthesis and characterization of conjugated copolymers containing different chromophores in the main chain 主鏈含不同孤立發光團之共軛高分子的合成與性質研究 Hung-Ruei Shen 沈泓睿 碩士 國立中正大學 化學工程研究所 92 A series of novel light-emitting copolymers having well-defined conjugation lengths and different chromophores have been synthesized. The solubility and the optical and electrochemical properties were investigated, and the effects of introducing nonlinear thiophene and 1,3,4-oxadiazole into the main chain were discussed. Single- and multi-layered LED devices fabricated with these copolymers were characterized. In this study, monomer 1(1,4-Bis(4-methylphenyl)benzene) and 3 (2,5-Bis(4-methylphenyl)thiophene) were synthesized by Suzuki cross-coupling reaction and monomer 7 (2,5-Bis(4-methylphenyl)-1,3,4-oxadiazole) were synthesized by cyclodehydration. Copolymers P1, P2 and P3 were prepared via a nucleophilic substitution of halide ions from halogenated monomer 1, 3 and 7 by alkoxide ions and formed a chromophores-nonconjugated alternating structure with well-defined conjugation lengths. TGA and DSC analyses indicated that all copolymers were thermally stable below 215℃ with Tgs higher than 90℃.While P1 is crystalline and has a Tm at 136℃, the others are amorphous materials. From UV/Visible and PL spectra of P1, the extent of intramolecular/intermolecular aggregation were studied. The elevated tail in UV/Visible spectra of P1 implied that very low contents of intramolecular/intermolecular aggregates were formed. With increasing concentrations of P1, the peaks at 542 nm in PL spectra appeared. The λmaxPL of P1 in solid film state was also red-shifted drastically to about 542 nm with a weak shoulder at about 470 nm. These results indicated that intramolecular/intermolecular aggregates of P1 shifted the wavelength to lower energy. By substituting thiophene and 1,3,4-oxadiazole for the middle phenyl ring in the chromophores structures as in P2 and P3, the optical properties and solubility were enhanced. Moreover, the multi-layered devices constructed with P2 and P3 emitted high luminescences 4289 cd/m2 (at 15 V and 110 mA) and 4879 cd/m2 (at 10 V and 51 mA), respectively. Thus, physical properties of conjugated copolymers can be highly different even if the conjugational length is uniform, and intramolecular/intermolecular interactions can lead to the formation of aggregates, which emitted different colors. Chien-Chao Tsiang 蔣 見 超 2004 學位論文 ; thesis 120 zh-TW |
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碩士 === 國立中正大學 === 化學工程研究所 === 92 === A series of novel light-emitting copolymers having well-defined conjugation lengths and different chromophores have been synthesized. The solubility and the optical and electrochemical properties were investigated, and the effects of introducing nonlinear thiophene and 1,3,4-oxadiazole into the main chain were discussed. Single- and multi-layered LED devices fabricated with these copolymers were characterized.
In this study, monomer 1(1,4-Bis(4-methylphenyl)benzene) and 3 (2,5-Bis(4-methylphenyl)thiophene) were synthesized by Suzuki cross-coupling reaction and monomer 7 (2,5-Bis(4-methylphenyl)-1,3,4-oxadiazole) were synthesized by cyclodehydration. Copolymers P1, P2 and P3 were prepared via a nucleophilic substitution of halide ions from halogenated monomer 1, 3 and 7 by alkoxide ions and formed a chromophores-nonconjugated alternating structure with well-defined conjugation lengths. TGA and DSC analyses indicated that all copolymers were thermally stable below 215℃ with Tgs higher than 90℃.While P1 is crystalline and has a Tm at 136℃, the others are amorphous materials. From UV/Visible and PL spectra of P1, the extent of intramolecular/intermolecular aggregation were studied. The elevated tail in UV/Visible spectra of P1 implied that very low contents of intramolecular/intermolecular aggregates were formed. With increasing concentrations of P1, the peaks at 542 nm in PL spectra appeared. The λmaxPL of P1 in solid film state was also red-shifted drastically to about 542 nm with a weak shoulder at about 470 nm. These results indicated that intramolecular/intermolecular aggregates of P1 shifted the wavelength to lower energy. By substituting thiophene and 1,3,4-oxadiazole for the middle phenyl ring in the chromophores structures as in P2 and P3, the optical properties and solubility were enhanced. Moreover, the multi-layered devices constructed with P2 and P3 emitted high luminescences 4289 cd/m2 (at 15 V and 110 mA) and 4879 cd/m2 (at 10 V and 51 mA), respectively.
Thus, physical properties of conjugated copolymers can be highly different even if the conjugational length is uniform, and intramolecular/intermolecular interactions can lead to the formation of aggregates, which emitted different colors.
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author2 |
Chien-Chao Tsiang |
author_facet |
Chien-Chao Tsiang Hung-Ruei Shen 沈泓睿 |
author |
Hung-Ruei Shen 沈泓睿 |
spellingShingle |
Hung-Ruei Shen 沈泓睿 Synthesis and characterization of conjugated copolymers containing different chromophores in the main chain |
author_sort |
Hung-Ruei Shen |
title |
Synthesis and characterization of conjugated copolymers containing different chromophores in the main chain |
title_short |
Synthesis and characterization of conjugated copolymers containing different chromophores in the main chain |
title_full |
Synthesis and characterization of conjugated copolymers containing different chromophores in the main chain |
title_fullStr |
Synthesis and characterization of conjugated copolymers containing different chromophores in the main chain |
title_full_unstemmed |
Synthesis and characterization of conjugated copolymers containing different chromophores in the main chain |
title_sort |
synthesis and characterization of conjugated copolymers containing different chromophores in the main chain |
publishDate |
2004 |
url |
http://ndltd.ncl.edu.tw/handle/22026974797165702355 |
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