三苯胺、噁唑及咔唑之側鏈取代含咔唑共軛高分子衍生物的合成及其應用於高分子發光二極體之研究

Abstract

在本研究中，主要合成以咔唑(carbazole)為主體，於咔唑的9-號氮上做改質，以YAMAMOTO聚合法，合成一系列以咔唑為主鏈的均聚物(homopolymer)與共聚物(copolymer)，均聚物的的部分，首先引入具有良好的傳導電洞效果及高三重態能階的卡唑，將其應用於高分子發光二極體的主體發光材料；共聚物(copolymer)的部分引入具有發光與傳導電洞特性的三苯胺(triphenylamine)與傳導電子特性的噁唑(oxadiazole)，因分子內具有Donor-Acceptor的結構而呈現雙極性(bipolar)特性，進而提高電荷轉移的效率，將其應用於藍光螢光材料；接著對合成出的一系列高分子利用凝膠滲透層析儀、熱重分析儀、微差掃描卡計、螢光光譜儀及電激發光實驗做光電性質分析與探討，進而應用於高分子發光二極體元件的製作與討論。在元件應用的部分，藍色螢光元件中，元件結構：ITO/PEDOT:PSS/P2/TPBi /Mg/Ag在亮度上有最好的表現，啟動電壓為7.5V，電壓於17V時達最大亮度為104 cd/m2，電壓於13.5V時達最大效率為0.12cd/A。綠色磷光元件中，元件結構：ITO /PEDOT:PSS / P6 + Ir(ppy)3(8 %) + PBD(20%) /Mg /Ag在亮度上有最好的表現，啟動電壓為7V，電壓於13V時達最大亮度為1080cd/m2，電壓於13V時達最大效率為0.42cd/A，其中磷光元件ITO /PEDOT:PSS / P6 + Ir(ppy)3(1%) + PBD(20%) /Mg /Ag，在效率的表現上為最佳，電壓於8V時達最大效率為2cd/A。

In this study, polycarbaozle derivatives were synthesized and polymerized via Yamamoto coupling reaction. Firstly, we synthesized the conjugated polycarbazole P6 which combined the structure characteristics of carbazole in the side chain as host material. Moreover, we synthesized the conjugated polycarbazole P1-P5 which combined the structure characteristics of triphenylamine and oxadiazole in the side chain as blue fluorescent materials. Polymers P1-P5 contained both of electron- and hole-transporting properties to achieve high efficiency. All the polymers were fully characterized by gel permeation chromatography (GPC), thermal gravimetric analyzer (TGA), differential scanning calorimeter (DSC), photoluminescence spectrophotometer (PL), and electroluminescent (EL) spectroscopy. Lastly, all the polymers were application on the device of polymer light emitting diode, and luminescent properties is discussed. At the results of blue fluorescence devices, device ITO/PEDOT:PSS/P2/TPBi /Mg/Ag has the best performance, turn on voltage is 7.5V, maximum brightness is 104 cd/m2 on 17V, and maximum efficiency is 0.12cd/A on 13.5V. At the results of green phosphorescence devices, device ITO /PEDOT:PSS / P6 + Ir(ppy)3(8 %) + PBD(20%) /Mg /Ag has the best performance, turn on voltage is 7 V, maximum brightness is 1080 cd/m2 on 13V, and maximum efficiency is 0.42cd/A on 13V.