磷光共軛高分子發光二極體之高效率綠光及高演色性白光多層結構設計

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研究生：	湯凱智 Tang, Kai-Chin
論文名稱：	磷光共軛高分子發光二極體之高效率綠光及高演色性白光多層結構設計 Design of highly efficient green and broad-band white multilayer phosphorescent polymer-based light-emitting diode
指導教授：	洪勝富教授 Prof. Horng, Sheng-Fu 孟心飛教授 Prof. Meng, Hsin-Fei
口試委員:
學位類別：	碩士 Master
系所名稱：	電機資訊學院 - 電子工程研究所 Institute of Electronics Engineering
論文出版年：	2007
畢業學年度：	95
語文別：	中文
論文頁數：	69
中文關鍵詞：	PLED 、磷光、白光、多層結構、高效率
外文關鍵詞：	PLED, phosphorescent, white, multilayer, high efficiency
相關次數：	點閱：2 下載：0
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利用PVK((poly(vinylcarbazole))當作主體以及兩種或三種銦金屬錯合物使用單層或多層結構來製作高效率的磷光PLED元件是本論文討論的重點。使用Ir(mppy)3((Tris-(2-4(4-toltyl) phenylpyridine))此種高效率的綠光並以旋轉潤濕的技術來塗佈電洞傳輸層TFB(poly (9, 9’-dioctylfluorene-co-N-(4-butylphenyl) diphenylamine))後可以得到效率達48cd/A的綠光LED元件。加入了紅光銦錯合物Ir(piq)2((1-phenylisoquinoline)(acetylacetonate)iridium(III))後可以得到高達23cd/A的效率並且有從500nm延伸到720nm的寬的放射光譜。在製作白光LED時利用FIrpic ((III) bis[(4,-6-di-fluorophenyl-pyridinato)N,C2]picolinate))參雜在PVK主體中以直接旋轉塗佈的方式當成第二層的發光層來完成白光元件。其涵蓋三色光所組成的白光效率達到8.1cd/A。當第二層發光層改為PFO ((Poly (9, 9-dioctylfluorene))後可得到高演色性係數86的白光光譜。最高效率為5.7cd/A而最高亮度為8900cd/m2。在此結構下紅光和綠光相對的質量比對於第二層藍光層加入後有著明顯的影響。

Efficient phosphorescent polymer light-emitting diode with
poly(vinylcarbazole) (PVK) doped by two or three iridium complexes in single and bilayer structures are studied. Using spin-rinsed methode for the device, the efficiency for Ir(mppy)3 (Tris-(2-4(4-toltyl) phenylpyridine)
device can reach to 48cd/A. With (Ir(mppy)3) as the green emitter and (1-phenylisoquinoline) (acetylacetonate) iridium (III) (Ir(piq)2) as the red emitter the efficiency is as high as 23 cd/A with broad band emission from 500 nm to 720 nm. For white emission a second layer is added with blue emitter ((III) bis [(4,-6-di-fluorophenyl-pyridinato)N,C2] picolinate) (FIrpic) doped in PVK. White light containing three spectral peaks results with efficiency 8.1 cd/A. As the second blue layer is replaced by the fluorescent (Poly (9, 9-dioctylfluorene)) (PFO) white emission with high color rendering index 86 is achieved. The efficiency is 5.7 cd/A with peak luminance 8900 cd/m2. For a given iridium complexes ratio the relative intensity of the green and red emission depends sensitively on the second blue layer.

中文摘要------------------------------------------------------------------------------------------I
英文摘要-----------------------------------------------------------------------------------------II
致謝----------------------------------------------------------------------------------------------III
目錄----------------------------------------------------------------------------------------------IV
Chapter I 序論
1-1    前言------------------------------------------------------------------------------------1
1-2    研究動機與目的---------------------------------------------------------------------2
1-3    論文架構------------------------------------------------------------------------------2
Chapter II 有機共軛發光二極體的原理介紹
    2-1 有機發光二極體之結構與發光原理---------------------------------------------4
2-2共軛高分子元件發光原理和電致發光(Electroluminance，EL)--------------6
        2-2-1蕭基接面(Schottky Contact)-----------------------------------------------6
        2-2-2 歐姆接面(Ohmic Contact)--------------------------------------------------7
2-3 螢光&磷光理論---------------------------------------------------------------------10
2-4 能量轉移機制-----------------------------------------------------------------------13
    2-4-1 輻射能量轉移--------------------------------------------------------------13
        2-4-2 非輻射能量轉移-----------------------------------------------------------13
2-5 高效率磷光LED設計-------------------------------------------------------------15
        2-5-1 樹枝狀磷光發光體(Dendrimer)----------------------------------------17
2-6 有機半導體元件之壽命-----------------------------------------------------------19
        2-6-1 非本質劣化-----------------------------------------------------------------19
        2-6-2 本質劣化--------------------------------------------------------------------19
2-7 演色性(color rendering index，CRI)---------------------------------------------20

Chapter III  實驗製程、材料介紹與實驗設計
    3-1 元件製作流程-----------------------------------------------------------------------22
        3-1-1 ITO基板蝕刻----------------------------------------------------------------22
3-1-2 ITO清洗----------------------------------------------------------------------23
3-1-3 PEDOT：PSS成膜(陽極)--------------------------------------------------23
3-1-4 主動區成膜-----------------------------------------------------------------24
3-1-5 陰極蒸鍍--------------------------------------------------------------------24
    3-2 元件的封裝與量測-----------------------------------------------------------------26
        3-2-1 封裝--------------------------------------------------------------------------26
        3-2-2 量測--------------------------------------------------------------------------26
    3-3 材料介紹-----------------------------------------------------------------------------27
        3-3-1 一般介紹--------------------------------------------------------------------27
    3-4 實驗設計與構想--------------------------------------------------------------------30
Chapter IV 實驗結果與分析
    4-1 比較電洞傳輸層TFB對元件的影響--------------------------------------------37
        4-1-1 加入TFB層的影響---------------------------------------------------------37
        4-1-2 改變配置溶液的環境產生的影響--------------------------------------39
    4-2 參雜紅光材料、比較氧氣之影響以及調變PBD造成之影響----------------42
        4-2-1  調配綠光跟紅光的比例-------------------------------------------------42
        4-2-2 加入Spin-rinsed TFB的影響---------------------------------------------44
        4-2-3 改變PBD的比例及旋轉塗佈的場所------------------------------------46
4-3 加入PFO製作白光LED及其分子量之比較------------------------------------50
        4-3-1 使用緩衝層製作白光LED------------------------------------------------50
        4-3-2 採用高分子量PFO製作白光LED---------------------------------------52
4-4 加入FIrpic製作白光LED----------------------------------------------------------55
        4-4-1 測試FIrpic單層條件-------------------------------------------------------55
            4-4-2 利用FIrpic製作多層白光LED-------------------------------------------58
            4-4-3 利用Ir(mppy)3：Ir(piq)2/FIrpic製作白光LED--------------------------61
4-5 總結各色光LED元件之表現-----------------------------------------------------64
Chapter V  結論
    Reference

                                

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