聚苯基乙烯系高分子衍生物之有機高分子發光二極體

Abstract

在本論文中，我們藉由不同的合成策略開發並製造出整套PPV系列的共聚高分子。並探討其在熱穩定性質、電化學性質、光學性質、以及元件製備上對於不同結構所影響的因素與變化。<br> 首先，我們合成出一系列之PPV-Fluorene共聚高分子，並將不同的結構分成三個系統來加以探討 (1)不同分子量對於PLED性質之影響與探討 (2) 不同末端基對於PLED性質之影響與探討 (3) 共聚高分子與三聚高分子改變上之影響與探討 並藉此三系統的討論對PPV-Fluorene系列之光電高分子應用於有機發光二極體有更深入的了解。<br> 我們也發現，當分子量在某一程度之上後其物理性質的影響主要在於元件製備中成膜性質之優劣與穩定度。而不同末端對於元件之光電性質也有相當大的影響，其中又以導入三苯基胺之末端基其對於元件光電性質的提升有最大的助益。並藉由簡單的旋塗製程與光轉換原理，成功的製作發出黃白光CIE 1931 (0.423,0.429)的元件。其最大亮度為400 cd/m2，效率高達3 cd/A。<br> 另外，在導入dibromobenzo thiadiazole單體成為三聚高分子之後，我們成功製作出高亮度綠光元件，在發光的強度上也提升至4250cd/m2，效率為2.3cd/A。

In this thesis, a series of PPV system polymers was synthesized and the relationships between chemical structure design and thermal stability、optical properties、electro-chemical properties or device performance are discussed.<br> At first, a series of PPV-Fluorene system copolymers was synthesized and discussed into three aspects (1) Molecular Weight Effect in PLED. (2) End Group Effect in PLED. (3) Copolymer and Tricopolymer Comparability in PLED. By doing research in these three systems, we interiorize the application of PPV-Fluorene system luminescent polymers in polymer light emitting diode (PLED). <br> It is found that the molecular weight mainly affects the film quality in device manufacturing when molecular weight increasing to a certain degree. End group is also an important improvement factor for luminescent properties of device, especially for applying triphenylamine group. On the other hand, based on luminescence conversion mechanism, a high efficiency PLED based on yellowish-white light CIE 1931 (0.423, 0.429) is successfully fabricated by simple spin-coating process. The device has 3 cd/A of efficiency and 400 cd/m2 of brightness.<br> By combining dibromobenzo thiadiazole group into PPV-Fluorene system copolymers as tricopolymers, a high brightness green light PLED device is also successfully fabricated. The device has 2.3 cd/A of efficiency and 4250 cd/m2 of brightness.