| 研究生: |
周聖頴 Chou, Sheng-Ying |
|---|---|
| 論文名稱: |
主鏈含三聯苯及四乙二醇醚基團之高分子:合成、鑑定及光電應用 Polymers Composed of p-Terphenyl and Tetraethylene Glycol Ether: Synthesis, Characterization and Optoelectronic Application |
| 指導教授: |
陳雲
Chen, Yun |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 化學工程學系 Department of Chemical Engineering |
| 論文出版年: | 2014 |
| 畢業學年度: | 103 |
| 語文別: | 中文 |
| 論文頁數: | 100 |
| 中文關鍵詞: | 高分子發光二極體 、電洞緩衝 、三聯苯 、四乙二醇醚 、光電元件 |
| 外文關鍵詞: | PLEDs, hole buffer material, p-terphenyl, tetraethylene glycol ether |
| 相關次數: | 點閱:71 下載:0 |
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有機發光二極體是藉由從陽極及陰極注入電洞及電子,並在發光層中再結合進而放光。因此,載子注入及傳輸速率的平衡是影響電流效率最重要的因素。然而在大部分的有機共軛材料中,電洞傳輸速度通常較電子傳輸速度快,造成元件發光層內的載子不平衡,也因此導致電流效率往往不高。固本研究開發可利用溼式製程成膜的電洞緩衝材料,藉此減緩電洞進入發光層,以平衡發光層內的載子,提高電流效率。
本研究利用Suzuki coupling reaction成功聚合出主鏈含三聯苯及四乙二醇醚基團之高分子3P5O做為電洞緩衝材料和主鏈含苯併咪唑及四乙二醇醚基團之高分子BZID5O,以核磁共振光譜(1H-NMR)、元素分析儀(EA)鑑定其結構。並討論3P5O和BZID5O之熱性質、光學性質、電化學性質、表面膜態與元件性質。然而BZID5O因溶解度和表面膜態不佳,無法在發光元件上有效運用。3P5O具有高熱裂解溫度(Td= 361.3 oC),薄膜態UV-Vis最大吸收與螢光光譜(PL)放光分別在276 nm和393 nm。由循環伏安法(Cyclic Voltammetry)量測計算出3P5O的LUMO能階(-2.15 eV)與HOMO能階(-5.86 eV)。而3P5O在PEDOT:PSS上的薄膜表面RMS roughness=1.35 nm。以3P5O當電洞緩衝層之發光元件結構為ITO/PEDOT:PSS/3P5O/SY/LiF/Al,在無電洞緩衝層之元件最大亮度為10017 cd/m2,最大電流效率為3.0 cd/A,而有電洞緩衝層之元件最大亮度為17050 cd/m2,最大電流效率為6.6 cd/A。其效果甚至較常見之電洞阻擋元件[ITO/PEDOT:PSS/SY/BCP/LiF/Al] (13639 cd/m2, 4.1 cd/A)表現出色。研究結果顯示3P5O擁有電洞緩衝的特性,且可以旋轉塗佈等溼式製程加工成膜製做多層元件,是改善元件電流效率的材料選擇之一。
An efficient hole-buffer polymer (3P5O) composed of p-terphenyl and tetraethylene glycol ether and copolymer (BZID5O) based on benzimidazolyl and tetraethylene glycol ether were synthesized by Suzuki coupling reaction. Chemical structure of 3P5O and BZID5O were characterized by 1H-NMR and elemental analysis, whereas thermal, optical and electrochemical properties were investigated by DSC& TGA, optical spectra and cyclic voltammetry, respectively. Unfortunately, BZID5O could not apply to PLED device because of poor surface morphology of it. 3P5O was then employed as hole buffer layer, between hole-injection (PEDOT:PSS) and emission (SuperYellow: SY) layer to evaluate its potential application in polymer light-emitting diodes (PLEDs). The 3P5O exhibited good thermal stability with thermal decomposition temperature (5% weight loss) being above 361 oC in nitrogen atmosphere. In film state, it showed absorption and photo luminescence peaks at 276 nm and 393 nm respectively. The 3P5O should slow hole-transport ability attributable to its tetraethylene glycol ether functional group. The maximum luminance and current efficiency of multi-layer [ITO/PEDOT:PSS/3P5O/SY/LiF/Al(80 nm)], with 3P5O layer as hole buffer layer were 17050 cd/m2 and 6.6 cd/A respectively, which are much better than those without 3P5O (10017 cd/m2, 3.0 cd/A). The performance enhancement has been attributed mainly to hole buffer characteristics of 3P5O layer. Current results indicate that the 3P5O is not only an efficient hole buffer material but also applicable in fabricating multilayer PLEDs by wet processes such as spin-coating.
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校內:2019-10-16公開