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研究生:謝博偉
研究生(外文):Po-Wei Hsieh
論文名稱:磷光敏化有機發光元件之研究
論文名稱(外文):Investigations of Phosphorescent Sensitized Organic Light-Emitting Devices
指導教授:張志豪張志豪引用關係
學位類別:碩士
校院名稱:元智大學
系所名稱:光電工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2010
畢業學年度:98
語文別:中文
論文頁數:88
中文關鍵詞:三重態激子焠熄磷光敏化機制
外文關鍵詞:Triplet-triplet annihilationphosphorescent sensitizer
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由於螢光材料只能利用25%的單重態激子放光,使得螢光元件效率
低於可使用全部激子放光的磷光元件之效率,然而,因三重態激子
有較長生命期,磷光有機發光元件在高電流密度時,高濃度的三重
激子會產生嚴重的三重態激子焠熄,造成元件效率遽降之效應。2000年Baldo 等人提出磷光敏化機制,可有效改善效率遽降問題,經多研究,綠、紅色磷光敏化元件皆有良好的研究成果,惟藍色磷光敏元件沒有進展。本論文提出新穎的同色光譜磷光敏化概念,製作同光譜藍色磷光敏化元件,以改善其高亮度下藍光元件的效率遽降問題;本論文亦以藍色磷光為增感劑,藉製作綠色、黃色及紅色磷光敏化元件來探討內部能量移轉機制。

The electrophosphorescence can efficiently use both singlet and triplet excited states and thus its internal quantum efficiency can in principle reach an ideal level of
100%, which is much superior to the 25% upper limit imposed by the formation of singlet excitons in fluorescence. However, phosphorescent OLEDs usually suffer rapid roll-off of efficiencies at high excitation densities, which is associated with long lifetimes of triplet excitons and the triplet-triplet annihilation. This issue may be mitigated by phosphor-sensitized fluorescence demonstrated by Baldo et al., in which
resonant energy transfer occurs between triplet excitons in the phosphor and singlets in the fluorophore. After several years’ endeavor, the researches of phosphorescent
sensitization had succeeded in red and green colors, but there was no progress in blue color. In this thesis, the novel idea of identical-spectrum phosphorescent sensitization was proposed to mitigate the serious roll-off of efficiencies in blue OLEDs. Besides, by employing blue phosphor as the sensitizer, the green, yellow, and red phosphorescent sensitized OLEDs were fabricated to analyze the energy transfer mechanism.

書名頁 .................................................. i
授權書 ................................................. ii
審定書 ................................................ iii
中文摘要................................................ iv
英文摘要................................................. v
誌謝 ................................................... vi
目錄 .................................................. vii
圖目錄 ................................................. ix
表目錄 .................................................xii
第一章 緒論……………………………………………………………1
1-1 前言…………………………………………………………………1
1-2 有機發光元件文獻回顧……………………………………………3
1-3 有機發光元件架構與發光原理……………………………………6
1-4 客體摻雜能量轉移發光機制………………………………………9
1-5 三重態焠熄與磷光敏化機制……………………………………19
1-6 研究動機…………………………………………………………23
第二章 研究內容………………………………………………………25
2-1 實驗流程…………………………………………………………25
2-2 使用材料…………………………………………………………28
2-3 實驗設計…………………………………………………………39
第三章 結果與討論……………………………………………………40
3-1 比較電子傳輸層與增加阻擋層之差異…………………………40
3-2 藍色磷光敏化機制………………………………………………46
3-3 藍色磷光敏化綠色螢光之元件設計……………………………56
3-4 藍色磷光敏化黃色螢光之元件設計……………………………65
3-5 藍色磷光敏化紅色螢光之元件設計……………………………74
第四章 結論……………………………………………………………83
參考文獻………………………………………………………………86

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