側鏈為電洞傳導基團、主鏈為電子傳導基團之 寡聚物合成與應用於OLED

Abstract

摘要 以2,2’-二碘聯苯單體為起始物，並在其2,2’-的位置上利用Suzuki偶合的方式接上具有電洞傳導性的化合物如：三苯胺，carbazole。並於4,4’-的位置製備雙甲基磷酸酯類，利用Wadsworth-Emmons反應再與π電子的雙甲醛類的化合物進行寡聚物的聚合。形成主鏈上具有電子傳導性，而側鏈上具有電洞傳導性的寡聚物材料 。利用所合成的寡聚物作元件的製備，再探討其電致發光與螢光，紫外光的性質。 並利用CV的電聚合使得寡聚物側鍊產生雙聚物形成寡聚物間互相交聯而沉積於ITO表面 取代PEDOT並以綠光磷光材料為發光層做成元件。 所得到的寡聚物P1∼27，具有高的熱裂解溫度（320∼5800C），及75~2420C的Tg點。寡聚物為發光層加入PBD的基本元件裡(ITO/PEDOT/Polymer(P1∼P27)+PBD/ Ca/Mg)：P9為藍綠色發光（478nm），具有低的啟動電壓4V，其最大亮度為1240cd/m2，最大效率為1.69 cd/A 。寡聚物為電聚膜的元件裡： P8為電聚膜時電聚三圈(85nm)，可以得到最大亮度為15300 cd/m2，最大效率為11 cd/A，啟動電壓為15∼16Ｖ。

Abstract We used 2,2’-diiodobiphenyl as starting material to couple with hole transporting compounds such as triphenylamines and phenylcarbazoles on 2,2’position by Suzuki reaction. After that, the derivates of 4,4’-bis(diethyl methylphosphonate) were synthesized, and oligomerized with π electron dialdehydes by Wadsworth-Emmons reaction to generate the oligomers, which have electrotransport main chain and holetransport side chain. The aforementioned oligomers were used as light emitters or electro-polymerization precursors in Light Emitting Devices. And the respectively electrical and optical properties were studied. All the oligomers, P1~27, have high Td,5% which ranged from 320 to 580 oC. And the Tg of these oligomers are between 75 and 242 oC. From the results of experiments, the best device of oligomers mixed with PBD as emitting layer : we got electroluminescence of P9 as green-blue; low turn on voltage was 4V; the best brightness was1240 cd/m2, and the best efficiency was 1.69 cd/A . In the device of oligomer as HIT(ITO/CV(P1∼P27)/41+PVK+PBD/Ca/Mg) : we got P8 as 3 cycles(85nm) with 15~16V turn on voltage , 15300 cd/m2 on best brighness, and 11 cd/A on best efficiency.