含供給與接受電子基團新型芴共聚物之合成及其在電激發光元件之應用

Synthesis and Electroluminescence Properties of Novel Fluorine-based Copolymers Containing Electron-Donor and Acceptor Moieties

謝澧佳(Li-Ga Hsieh)

指導教授 ： 汪昆立

國立臺北科技大學/工程學院/化學工程研究所/碩士(2008年)

https://doi.org/10.6841/NTUT.2008.00055

摘要

聚芴(Polyfluorene)本質上是ㄧ高電洞移動率之傳導材料，一般藉由導入多電子與缺電子基團改善電子及電洞傳導性質。
A部分中，本研究以電子供給三苯胺與電子收受1,2,4-三氮唑結構合成出以芴為主之共聚合物。合成之PTPATAZ-F8與PTAZTPA-F8之高分子具有不錯熱穩定性，熱裂解溫度（Td5）分別為403℃以及411℃，玻璃轉移溫度（Tg）分別為135℃以及185℃。薄膜螢光光譜最大放射波長在413-435nm，符合藍光顏色。電化學結果顯示，PTPATAZ-F8之HOMO能階相較PTAZTPA-F8要來的高。其中PTPATAZ-F8做為發光元件，其最大發光波長為444nm，驅動電壓為6V，最大亮度達到84cd/m2，最大效率為0.044cd/A，在CIE色座標值於（0.160, 0.130）為藍光區域。
B部份中，利用A部分所合成的單體導入缺電子2,1,3-苯並噻二唑於高分子主鏈。合成之PTPATAZBT-F8與PTAZTPABT-F8之高分子具有不錯熱穩定性，熱裂解溫度（Td5）分別為433℃以及406℃，玻璃轉移溫度分別為155℃以及153℃。薄膜螢光光譜最大放射波長在541-547nm，符合黃綠光顏色。電化學結果顯示，PTPATAZBT-F8與PTAZTPABT-F8之HOMO能階與A部分一模一樣。其中PTPATAZBT-F8做為發光元件，其最大發光波長為542nm，驅動電壓為5V，最大亮度達到696cd/m2，最大效率為2.02cd/A，在CIE色座標值於（0.345, 0.625）為黃綠光區域。

關鍵字

芴 ； 三苯胺 ； 1,2,4-三氮唑 ； 2,1,3-苯並噻二唑

並列摘要

Polyfluorene is a well known hole-transporting material with high mobility. Attempts have been made to improve the electron-transport and hole-transport properties of polyfluorenes by introducing electron-donor and electron-acceptor moieties, respectively.
In part A, we synthesized two fluorene-based copolymers through the incorporation of electron donor triphenylamine and electron acceptor 1,2,4-triazole moieties group into the polymer backbone. The PTPATAZ-F8 and PTAZTPA-F8 copolymers exhibited good thermal stability with 5％ loss weight temperature of 403℃ and 411℃, and the glass transition temperatures of 135℃ and 185℃, respectively. The emission maxima of copolymer films on the photoluminescence spectra were 413-435 nm, which corresponded to blue color. From electrochemical results, PTPATAZ-F8 containing triphenylamine main chain showed high ionization potential（HOMO=-5.31） than PTAZTPA-F8（HOMO=-5.72）. Electroluminescence device with the configuration of ITO/PEDOT：PSS/ PTPATAZ-F8/LiF/Al was fabricated to evaluate the potential EL application. The device using PTPATAZ-F8 as the active layer showed EL performance with max emission band at 444nm and turn-on voltage at 6V. The maximum luminance was 84 cd/m2 and the maximum luminance efficiency was 0.044 cd/A. The CIE’ 1937 coordinate was located at（0.160, 0.130）.
In part B, we used the monomers in port A through the incorporation electron acceptor 2,1,3-benzothiadiazole into the polymer backbones. The PTPATAZBT-F8 and PTAZTPABT-F8 copolymers exhibited good thermal stability with 5％ loss weight temperatures of 433℃ and 406℃, and the glass transition temperatures of 155℃ and 153℃, respectively. The emission maxima of copolymer films on the photoluminescence spectra were 541-547 nm, which corresponded to yellow-green color. From electrochemical results, the HOMO level of PTPATAZBT-F8 and PTAZTPABT-F8 showed the same as part A. The device using PTPATAZBT-F8 as the active layer showed best EL performance with max emission band at 542nm and turn-on voltage at 5V. The maximum luminance was 696 cd/m2 and the maximum luminance efficiency was 2.02cd/A. The CIE’ 1937 coordinate was located at（0.345, 0.625）.

並列關鍵字

fluorene ； triphenylamine ； 1,2,4-triazole ； 2,1,3-benzothiadiazole

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