新型聚三烷基?吩衍生物的合成與光電性質的探討; Synthesis, Characterization, and Opto-electronic Properties of Donor-Acceptor Conjugated Copolymer Based on Poly-3-octylthiophene Derivatives

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/6021

Title:	新型聚三烷基?吩衍生物的合成與光電性質的探討;Synthesis, Characterization, and Opto-electronic Properties of Donor-Acceptor Conjugated Copolymer Based on Poly-3-octylthiophene Derivatives
Authors:	林永洲;Yung-Chou Lin
Contributors:	化學研究所
Keywords:	有機發光二極體;共軛高分子;光電特性;conjugated polymer;opto-electronic properties;polymer light-emitting diodes
Date:	2004-06-24
Issue Date:	2009-09-22 10:12:00 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	摘要利用Suzuki Coupling 或 Stille Coupling方法合成一系列具有donor: alkylthiophene (or bis(3-octylthiophene))/acceptor: 2,6-pyridine (or 3,8-phenanthrolin)重複交替的ABA型或AB型螢光共軛高分子。並以 1H-NMR、FT-IR、 ESCA、 EA、GPC、TGA、DSC、UV-Vis、PL及TR-PL (時間解析螢光光譜) 進行結構分析與性質測試。此系列高分子能溶於一般的有機溶劑並且擁有不錯的熱穩定性。研究中發現此系列高分子的光電性質與高分子之主鏈結構有關：在UV和PL光譜中，發現將吡啶或二氮雜啡加入高分子之主鏈中會有藍位移的現象且能提高其螢光效率，此系列高分子隨著溫度的增加其最大吸收光譜會藍位移產生熱致變色的現象，含吡啶之聚三烷基噻吩衍生物與酸作用後其螢光強度有增加的趨勢；而含二氮雜啡之聚三烷基噻吩衍生物隨著溶劑的極性增加其螢光強度也有相對增加的現象，具有溶劑效應。由TR-PL中得知含吡啶之聚三烷基噻吩衍生物有較長的life time，其中又以POTPy最長。將此系列高分子製作成( ITO/ Polymer / Al )元件，可以得知此系列高分子之EL光色與CIE座標，藉以判斷其應用在PLED的可能性。 Abstract A novel series of conjugated copolymers comprising alternating π-excessive alkylthiophene (or bis(3-octylthiophene)) and π-deficient 2,6-pyridine (or 3,8- phenanthrolin) moieties were synthesized using a palladium-catalyzed Stille coupling reaction or Nickel-catalyzed Suzuki coupling reaction. They are characterized by 1H-NMR, FT-IR, ESCA, EA, gel permeation chromatography(GPC), thermogravimetric analysis(TGA), differential scanning calorimeter (DSC), UV-Vis absorption, fluores- cence spectroscopies, and time-resolved photoluminescence spectroscopy (TR-PL). These copolymers were highly soluble in common organic solvents and showed good thermal stability. The electronic and optical properties of these copolymers were closely related to the structures of the polymer backbone. Copolymers containing 2,6-pyridine or 3,8- phenanthrolin moieties not only exhibited blue shifts in UV-Vis absorption and fluorescence spectra but also enhanced the quantum yield significantly compare to their thiophene analogues. The λmax of poly-3-octylthiophene derivatives underwent a blue shift and intensity decreasing with increasing temperature. This thermochromic behavior was reversible. The quantum efficiency of copolymers containing 3,8- phenanthrolin increased with increasing solvent polarity, from less polar toluene to highly polar NMP. TR-PL spectra revealed that copolymers contained pyridine moiety will have a longer life time and therefore higher quantum efficiency. A single layer PLED devices was fabrication by using POTPyOT as a luminescence layer demonstrated that these novel copolymers might be promising materials for applications in light-emitting diodes.
Appears in Collections:	[Graduate Institute of Chemistry] Electronic Thesis & Dissertation

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