臺灣博碩士論文加值系統

螢光電激發光中，電子於空間碰撞會產生25 %的單重態與75 %的三重態，由於自旋禁阻的限制，使得電子與電洞在結合後激發，但激發三重態都以非輻射的方式失去活化能，大大侷限了本身發光特性。而磷光發光材料並不會有自旋禁阻的限制問題，能有效改善有機發光二極體特性。
本實驗中，我們將藍光磷光材料FIrpic 掺雜進入CBP 材料中，並比較不同電洞阻擋層對元件發光特性的影響，選出一個較佳的電洞阻擋層材料為TPBi。接著比較不同FIrpic 掺雜濃度，討論掺雜濃度對元件發光特性的影響， FIrpic 材料濃度於8 %時，最大亮度與效率分別為4100 cd/m2 和16.9cd/A，最佳元件結構為ITO/MT-DATA(15 nm)/NPB(40 nm)/CBP:FIrpic(8%,30 nm)/TPBi(40 nm)/LiF(0.7 nm)/Al(200 nm)。探討實驗結果時，發現於高電流密度下有Exciplex 現象產生，並驗證Exciplex 波長約在496 nm。
接下來實驗中，將紅光發光材料rubrene 以共摻雜方式於藍色磷光發光層(CBP:FIrpic)內來製作白光元件，結構為ITO/m-MTDATA(15nm)/NPB(40nm)/ CBP:FIrpic: rubrene (91%,8%,1%,30nm)/TPBi(40nm)/LiF(0.7nm)/Al(200nm) 。成本s作出具有475 nm、496 nm、580 nm 合成光譜之白光發光二極體，在低電流密度下可獲得最大效率為7.2 cd/A。

In fluorescent electroluminescent emission, an electron collision in space can produce 25 % for singlet and 75 % for triplet. Because of electron spin forbidden effect, the activated energy of triplet exciton excited from the recombination of electron and hole is all loss for non-radiation. Therefore, it exhibits an upper limit on the emission efficiency by itself. There is not electron spin forbidden effect in phosphorescent electroluminescent emission materials and the emission efficiency of phosphorescent organic light emitting diodes (OLEDs) can be improved.
The blue phosphorescent material, FIrpic, is doped into the CBP host material. to compare emission layer. The characteristics of OLEDs are discussed based on the structure of various hole blocking layer. Experimental results reveal that TPBi is suitable for the hole blocking material. When an OLED with 8% FIrpic doping concentration in CBP, the maximum luminance and efficiency are 4100 cd/m2 and 16.9 cd/A. The device’s structure is ITO/m-MTDATA(15 nm)/NPB(40 nm)/CBP:FIrpic(8 %, 30 nm)/TPBi(40 nm)/LiF(0.7 nm)/Al(200 nm). Exciplex phenomenon occurs for high current intensity and displays a peak wavelength at 496 nm. Exciplex phenomenon is also discussed in the study.
Rubrene is used as a red dopant and is co-doped into CBP:FIrpic emittinglayer. The device’s structure is ITO/m-MTDATA(15 nm)/NPB(40nm)/CBP:FIrpic:rubrene (91%, 8 % and 1 %, 30 nm)/TPBi(40 nm)/LiF(0.7 nm)/Al(200 nm). The white emission spectrum is formed by 475 nm, 496 nm and 580 nm peak wavelength. The white OLED has the maximum efficiency of 7.2 cd/A at low current density.

中文摘要Ⅰ
英文摘要Ⅱ
感謝Ⅳ
目錄Ⅴ
圖目錄Ⅶ
表目錄Ⅸ
第一章 緒論
1-1 研究動機1
1-2 研究目的3
第二章 基本理論
2-1 有機電激發光元件文獻回顧4
2-2 有機電激發光元件的激發機制4
2-3 OLED 元件的基本結構5
2-4 有機發光二極體之材料6
2-5 OLEDs 元件衰敗之原因9
第三章 磷光發光二極體
3-1 螢光與磷光11
3-2 磷光有機電激元件設計12
3-3 磷光有機電激材料之發展14
3-3-1 藍光磷光材料14
3-3-2 綠光磷光材料15
3-3-3 紅光磷光材料15
第四章 實驗步驟與系統描述
4-1 研究方法17
4-2 實驗流程18
4-3 實驗用之螢光材料與磷光材料19
4-4 系統20
4-5 ITO 玻璃處理20
4-5-1 ITO 玻璃圖案呈現20
4-5-2 ITO 玻璃蝕刻與清洗21
4-5-3 陽極表面處理21
4-6 有機層及金屬陰極之成長22
4-7 有機元件封裝23
4-8 薄膜量測
4-8-1 螢光光譜儀23
4-8-2 厚膜量測儀器23
4-8-3 光學顯微鏡24
4-9 元件之量測
4-9-1 IV 特性之量測24
4-9-2 電激光譜量測24
4-9-3 亮度特性之量測24
第五章 實驗結果與討論
5-1 研究動機26
5-2 探討主體與客體之間能量傳遞情形26
5-3 各種不同電洞阻檔材料對於元件之影響27
5-4 各種不同磷光掺雜對於元件之影響29
5-5 Exciplex 對藍光色純度影響31
5-6 白光磷光發光二極體探討與研製33
第六章 結論35
參考文獻36

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