| 摘要: | 有機高分子發光材料的發展，在學術界或是工業界已經引起廣泛的討論與興趣。文獻中指出，共軛高分子用於發光元件的加工效能取決於其solution-process。然而共軛之Dendrimers〔樹枝狀型高分子〕於有機發光材料中潛在的利基；在於本身擁有比共軛高分子更多更好的優勢，其優勢如下： 一?Dendrimers其材料合成上為一種較為制式化的合成，且其材料對於外在因素的容忍度亦有較高的彈性。 二、Dendrimers其材料於製成和電性質方面可以單獨的進行最適化改質的動作。 因此，有機發光二極體之發光材料結合了樹枝狀巨分子的特性後，將帶領有機發光二極體進入一個嶄新的領域。近年來， Dendrimers已經應用於有機發光二極體之發光材料。 在研究當中，我們首先利用電腦模擬運算設計目標之樹枝狀高分子，並經由分子動力模擬瞭解其分子構形與合成間之相關性，以及串聯AM1、ZINDO、HF等方法以利瞭解材料之光物理性質。之後，藉由模擬的結果設計合成出PFO (Poly(9,9’-dioctylfluorene)) 、和具有triazines的樹枝狀側鏈之polyfluorene；以及PPV系之DB-PPV (Poly(2,3-dibutoxy-1,4-phenylene vinylene))。最後對此三個不同光色系統之有機發光二極體材料進行研究分析其物理、化學及光學性質。 為了提升材料應用性與未來產業趨勢，於研究當中亦以低溫沈積方法將可撓式塑膠基板鍍上ITO (Indium tin oxide)導電層，後以濕室蝕刻、黃光半導體製程製作出可撓式Arton塑膠陽極基板。探索其作為可撓式發光原件之可行性。 The development of light emitting polymers has been the subject of intense academic and industrial research. Conjugated polymers have dominated solution-processed OLEDs, and device with good efficiencies have been reported. On the other hand, conjugated dendrimers have a number of potential advantages over conjugated polymers as OLEDs. First, they can be produced via a modular synthesis giving a greater flexibility over controlling the properties. Second, the processing and electronic properties can be optimized independently. Hence, OLEDs in combination with dendritic macromolecules characteristics show great potential as the next generation of OLED and has receive attention. Recently, solution-processible dendrimers have been developed for use as the light-emitting layer in OLEDs. In current research, light emitting materials with dendrimer side chain in the 9-position of fluorene unit has been synthesized. This polymer bears cylinder shape; which consists of surface group, triazines dendron, and the fluorene core（the PLED backbone is the core of the dendrimer）; similar to spherical dendrimers. However, the dendritic surface group (side chain) yields favorable processing properties including improved solubility and thermal stability. We expect that dendritic side chain will prevent π-stacking and reduces polyfluorene aggregation. Furthermore, dendritic side chain served as chromophore which also shields the PF main chain for undesirable side effects such as oxidation, degradation and impure energy transfer. By this design, the structure and conformation will ensure superb electro-optic properties. Molecular simulation (AM1, Zindo, HF) of the dendritic PLED confirms the correlations between the structure, conformations and photo physical properties. |
