高分子發光二極體(Polymer Light Emitting Diode, PLED)具備自發光、無視角限制、高應答速度、解析度佳、重量輕、厚度薄、可撓曲、可製作大面積等多項優點，應用於平面顯示器上極具潛力。PLED是利用從陽極、陰極注入的電洞及電子於發光層中再結合而發光，因此電荷傳遞速率之平衡對發光效率有非常大之影響。大部分PLED高分子電洞注入速率大於電子，所以可利用多層結構導入電子傳遞層(Electron Transport Layer, ETL)、摻混電子傳遞分子，或是利用化學合成改變分子結構，來提升電子注入的能力。
　　本研究合成主鏈含孤立發光基團的高分子，在結構上以二苯乙烯苯衍生物為發光基團，為增加電子注入的速率，導入具電子傳遞功能的噁二唑基團及含拉電子取代基的三聯苯基團，利用親核性取代反應合成聚芳香醚高分子。在物理性質方面，高分子P1~P3具有良好的熱穩定性和溶解度。在光學性質方面，P1~P3的螢光光譜皆有能量轉移的現象，使高分子的發光及相對量子產率皆由發光基團所控制，此外亦利用模式化合物作能量轉移的討論；在薄膜態時，因高分子間有著不同的作用力，造成各個高分子有著不同的最大發光波長。在電化學性質方面，利用氧化和還原起始電位分別求出高分子HOMO和LUMO能階，因電子傳遞基團的導入，使高分子LUMO能階都有明顯下降，表示改善了電子注入的能力。元件方面，P1~P3雙層元件的起始電場分別為4×105 V/cm、12×105 V/cm、10×105 V/cm，最大亮度則為225、87.4、35.8 cd/m2，與單層元件和未含電子傳遞基團之高分子P5元件相較下，皆有著優異的表現。

　　Polymer light emitting diode (PLED) have attracted much interest in recent years because of their potential application in large-area flat panel displays. However, most LED polymers are p-doped devices, so the mobility of holes is usually much greater than that of electrons. An optimized PLED should have efficient and balanced charge injection between anode and cathode. In order to achieve balanced charge injection, introducing electron transporting units in polymer structure can also be　employed to balance charge injection.
　　In this work, three isolated copolymers including emitting segments (distyrylbenzene derivatives) and electron-transporting segments (oxadiazole derivatives and terphenyl) were synthesized and characterized. These poly(aryl ether)s can be dissolved in organic solvents, and exhibited good thermal stability with 5% weight loss temperature above 400℃ in nitrogen atmosphere. The emission and the PL quantum yield of the polymers were dominated by the fluorophores with longer emissive wavelength via energy transfer from electron-transporting segments. Therefore, the oxadiazole and terphenyl moiety only as the electron-transporting/hole-blocking units in these polymers, and the other segments are the emissive centers and the hole-transporting units. The HOMO and LUMO of these polymers have been estimated from their cyclic voltammograms. The electron affinity can be enhanced by introducing isolated electron-transporting segments that lead to charge injection balance. In double layer LED devices [Al/PEDOT/polymers (P1~P3)/ITO glass],incorporation of oxadiazole unit increases the luminance and reduces the turn-on electric field better than terphenyl unit and the device performance were better than P5 which doesn`t contain electron-transporting unit or containing emitting unit only.

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