| 研究生: |
李柏毅 Lee, Po-I |
|---|---|
| 論文名稱: |
以聚茀高分子共聚物為主之高分子白光及磷光發光二極體材料 Fluorescent and phosphorescent polymeric white-light emitting diodes based on polyfluorene copolymers |
| 指導教授: |
許聯崇
Hsu, Lien-Chung Steve |
| 學位類別: |
博士 Doctor |
| 系所名稱: |
工學院 - 材料科學及工程學系 Department of Materials Science and Engineering |
| 論文出版年: | 2007 |
| 畢業學年度: | 95 |
| 語文別: | 中文 |
| 論文頁數: | 172 |
| 中文關鍵詞: | 磷光 、白光 、聚茀 |
| 外文關鍵詞: | white light, phosphorescent, polyfluorene |
| 相關次數: | 點閱:68 下載:1 |
| 分享至: |
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本論文主要包含三個部分:
第一部分:利用末端接枝quinoline或pyridine的polydioctylfluorenes與4,4'-dimethyl-2,2'-bipyridyl (tricarbonyl)rhenium(I) chloride反應後,可得到電激發磷光的高分子材料。經由紅外線光譜與光激發光光譜的分析,可以證明我們有將錸錯合物導入高分子鏈上,而能量便可藉由三重態能階的平衡來達到傳輸的效果。由電激發光光譜中可以發現,高分子材料同時具有polydioctylfluorene與錸錯合物的激發貢獻,整體發光是屬於藍白光。
第二部分:我們嘗試使用一種新的方式來達到單一螢光高分子系統發白光的效果;利用末端接枝把染料N-phenyl-1,8-naphthalimide(NTI)導入聚茀高分子共聚物[poly(dioctylfluorene-co-benzothiadiazole)]鏈上。經由調整三個單體的莫耳分率,在元件結構為:indium tin oxide/poly(3,4-ethylenedioxythiophene):poly(styrene sulfonic acid)/emission layer/Ca/Ag的情況下,電激發光光譜可以達到發白光的效果。其最大亮度為251 cd/m2,電流密度是400 A/m2,Commission Internationale de l’Eclairage (CIE)座標為(0.31, 0.39)。高分子共聚物的電激發光光譜在不同電壓下,都具有不錯的色彩穩定性。
第三部分:藉由dioctylfluorene單體與銥錯合物共聚合,再以末端接枝方式導入染料(NTI),本研究可得到單一磷光高分子發出白光的效果。高分子共聚物都具備不錯的熱穩定性,其5%熱重損失介於380~413°C,玻璃轉移溫度則為75~137°C。經由調整三個單體的莫耳分率,在元件結構為:indium tin oxide / poly(3,4-ethylenedioxythiophene):poly(styrene sulfonic acid)/ polyvinylcarbazole (PVK)/emission layer/Ca/Ag的情況下,我們可以得到發白光的元件。其最大亮度為300 cd/m2,電流密度是2900 A/m2,Commission Internationale de l’Eclairage (CIE)座標為(0.33, 0.34)。
The dissertation is divided into three parts.
Part 1: Novel electrophosphorescent polymers were prepared from quinoline and pyridine end-capped polyfluorenes reacted with 4,4'-dimethyl-2,2'-bipyridyl (tricarbonyl)rhenium(I) chloride. Fourier transform infrared (FT-IR) and photoluminescence (PL) spectroscopy confirmed that the rhenium complex was successfully incorporated into the polymer backbones. The energy transfer can be reached by balanced triplet energy state. The emission contributions of polyfluorene and the organic complex were found from the electroluminescence (EL) spectra.
Part 2: New polymer white-light-emitting diodes from single polymer systems have been developed. The polymer systems were based on poly(fluorene-co-benzothiadiazole) backbones end-capped with a dye(N-phenyl- 1,8-naphthalimide). By changing the molar ratio of these three units, the electroluminescence (EL) spectra can be adjusted to white-light emission with a structure of indium tin oxide/ poly(3,4-ethylenedioxythiophene): poly(styrene sulfonic acid)/emission layer/Ca/Ag. The highest brightness in such a device configuration is 251 cd/m2 at a current density of 400 A/m2 with Commission Internationale de l’Eclairage (CIE) coordinates of (0.31, 0.39). The EL spectra show color stability over different operating voltages.
Part 3: New white polymeric light-emitting diodes (WPLEDs) from phosphorescent single polymer systems have been developed using dicotylfluorene monomer copolymerized with a phosphorescent dye, and end-capped with dye. All of the copolymers have good thermal stability with 5 % weight loss temperatures at 380~413°C and glass transition temperatures at 75~137°C. We obtained white-light-emission devices by adjusting the molar ratio of the co-monomers with a structure of indium tin oxide/poly(3,4-ethylenedioxythiophene): poly(styrene sulfonic acid)/ polyvinylcarbazole (PVK)/emission layer/Ca/Ag. The highest brightness in such a device configuration is 300 cd/m2 at a current density of 2900 A/m2 with Commission Internationale de l’Eclairage (CIE) coordinates of (0.33, 0.34).
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