高分子發光二極體電子注入層結構與發光層厚度對元件光電特性影響之研究

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姓名

黃振岡(Chen-Kang Huang) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

高分子發光二極體電子注入層結構與發光層厚度對元件光電特性影響之研究
(Study on the influence of electron injection layer structures and emitter layer thickness on electro-optical characteristics of the polymer light emitting diodes)

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至系統瀏覽論文 (2028-7-24以後開放)

摘要(中)

本論文旨在研究高分子發光二極體的電性與光學特性，在高分子發光二極體中，隨著不同注入結構與各層模之間不同厚度的搭配，通常會影響發光效率與光譜，因此，本研究使用PPV 衍生物Super Yellow (SY) 作為發光層、ZnO:PEI作為電子注入層並改變兩者的實驗參數與厚度，觀察高分子發光二極體的外部量子效率，最終以ZnO:PEI為1:0.33、SY 為75 nm製作出發光效率為4.14 %的PLED，並藉由電性與光學分析探討影響元件效率高低的原因。
由實驗結果表明，SY PLED 中電洞傳輸效率高於電子傳輸效率，在電子注入層ZnO:PEI 摻入適當比例PEI於ZnO有助於降低電子注入能障至0.1 eV，同時可阻擋電洞並增加電洞於ZnO/SY界面處的累積，進一步幫助電子注入與電洞在SY復合發光。此外，實驗結果表明，當摻入過多的PEI時會導致薄膜表面的電阻值與粗糙度提升，同時，我們藉由Macleod軟體模擬PLED的內部電場分布並分析之，同時也探討PLED中的光學損耗模態。

摘要(英)

This study aims to discuss the electrical and optical properties of organic light-emitting diode (PLED). In general, the layer thicknesses and injection structures of an PLED may influence the emission efficiency and output spectrum. In this study,we use the PPV derivative , Super Yellow, as the emitter layer, and ZnO:PEI as the electron injection layer, and measure the external quantum efficiencies (EQEs) of the PLEDs as a function of electron injection structures and SY layer thicknesses, we fabricate a PLED with external quantum efficiency 4.14% by using ZnO:PEI for 1:0.33 and SY for 75 nm. We then discuss the results of the different EQEs through the electrical and optical analyses.
Our result shows that the hole transport is much more efficient than electron transport in an SY PLED. ZnO:PEI is an nano-composite structure, and an appropriate PEI ratio in the ZnO layer can reduce the electron injection barrier while blocking holes and increasing hole accumulations at the ZnO/SY interface, further facilitating the electron injection and recombination with holes in SY. Furthermore, we use the Macleod optical software to simulate and analyze the electric field distribution within the PLEDs, and also discuss the optical losses modes in the PLED structure, from which the influence of the SY thickness on the emission properties is explained.

關鍵字(中)

★ 有機發光二極體
★ 光電特性
★ 電子注入層
★ 發光層
★ 高分子
★ 電致發光

關鍵字(英)

論文目次

摘要 i
Abstract ii
致謝 iii
目錄 iv
第一章緒論 1
1-1高分子發光二極體 1
1-2研究動機 5
第二章基本原理 6
2-1高分子發光二極體 6
2-2載子的傳輸與注入 7
2-2-1跳躍理論 7
2-2-2空間電荷限制電流 8
2-3 載子遷移率 8
2-4 單載子元件 9
2-5 PLED結構內部的光學損耗 10
2-6 PLED結構的光學模態 12
2-7 發光層中偶極矩的排列方向 14
2-8 外部量子效率 15
第三章實驗方式、步驟與材料介紹 16
3-1 製程儀器介紹 16
3-1-1熱蒸鍍系統 16
3-1-2手套箱 17
3-1-3旋轉塗佈機 18
3-2量測儀器介紹 18
3-2-1光電量測: SPA、Photodiode 19
3-2-2光纖量測系統 20
3-2-3紫外光電子能譜 21
3-2-4紫外/可見/紅外光譜儀 22
3-3實驗步驟與材料 23
3-3-1 PLED元件製程 23
3-3-2 Electron-only元件製程 25
3-3-3 Hole-only元件製程 25
3-3-4 實驗材料 26
第四章實驗結果 28
4-1 Super Yellow (SY) 發光材料 28
4-2 SY PLED (改變ZnO:PEI電子注入層比例) 30
4-2-1 PLED(改變電子注入層ZnO:PEI) 30
4-2-2 單載子元件 (Electron-only devices) 32
4-2-3 紫外光、X射線光電子能譜與原子力顯微鏡量測 33
4-2-4 ZnO:PEI電子注入層總結 40
4-3 SY PLED (改變SY厚度) 40
4-3-1 PLED(改變SY發光層的厚度) 40
4-3-2單載子元件 42
4-3-3 光學分析 48
第五章結論與未來展望 53
參考文獻 54

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指導教授

張瑞芬

審核日期

2023-7-26

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