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研究生:劉舜維
研究生(外文):Shun-Wei Liu
論文名稱:混合層技術對有機發光二極體壽命影響之研究
論文名稱(外文):Lifetime Study of Organic Light Emitting Devices by Using Mixed Layer Technology
指導教授:黃清安張毅張毅引用關係
指導教授(外文):Ching-An HuangYih Chang
學位類別:碩士
校院名稱:長庚大學
系所名稱:機械工程研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2003
畢業學年度:91
語文別:英文
論文頁數:47
中文關鍵詞:有機發光二極體混合層
外文關鍵詞:Organic Light Emitting DevicesLifetimeMixed LayerMixed HostOLEDs
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不同於一般傳統的顯示器,有機發光二極體(Organic Light Emitting Devices; OLEDs)具有可撓性、自發光、低成本、無視角(大於160度)及全彩化,因此目前國內外研究單位和產業界,皆投入大量經費與人力,以期望能快速發展OLEDs技術,不過以目前OLEDs的發展速度還是無法大量進入商品化階段,其中最主要原因就是元件壽命(t1/2)低於面板廠商的環測標準。所以在這次論文,我利用混合層(Mixed Layer; ML)技術去改善元件的壽命問題(在初始亮度10,000cd/m2下大於60小時);此外混合層元件,具有高發光效率的特性(在8V時亮度可達244,100 cd/m2,發光效率大約4.34 cd/A)。另一方面,我將會針對電子及電洞在混合發光層內的傳遞機制做一詳細探討。

Unlike traditional Liquid-Crystal Displays (LCDs), Organic Light Emitting Devices (OLEDs) are self-luminous and need no backlighting. Despite these advantages, OLEDs are not widely commercialized due to its short operation lifetime. In this thesis, the lifetime mechanism in OLEDs, where the device structure based on a mixed emitting layer (EML), is investigated in terms of carrier transport and direct holes-electrons recombination. The mixed EML is sandwiched between the hole and electron transport layers. From accelerated degradation tests, the operation lifetime of optimal mixed layer (ML) device is considerably improved over the heterojunction (HJ) OLEDs, which shows the lifetime of about 60 h with initial luminance of 10,000 cd/m2. This significant improvement in device lifetime is attributed to the elimination of the organic-organic interface. In addition, the luminance reaches 244,100 cd/m2 at 8V, which corresponds to a luminous efficiency of 4.34 cd/A. These results demonstrate that the mixed EML can extend the performance of OLEDs without significantly changing the device structure or organic material.

CONTENTS
ACKNOWLEDGEMENTS iv
ABSTRACT v-vi
LIST OF FIGURES viii-xi
LIST OF TABLES xii
CHAPTER 1. INTRODUCTION………………………...……… 1
1.1 Background………………………………………...……... 1
1.2 Motivation…………………………………………..……. 2
1.3 Thesis Organization……………………………….……… 3
1.4 References……………………………………………..…. 3
CHAPTER 2. ORGANIC LIGHT EMITTING DEVICES….… 4
2.1 Structure & Operation……………………………………. 4
2.2 Mixed Layer OLEDs………………………………….…….. 8
2.3 References……………………………………….……….. 10
CHAPTER 3. EXPERIMENTAL SETUP……………………… 12
3.1 Thin Film Process……………………………….……... 12
3.2 B-I-V & Lifetime Measurements………………………… 13
3.3 Time-of-Flight……………………………………………. 14
3.4 AC Impedance Spectroscope……………………………... 18
3.5 References……………………………………………... 21
CHAPTER 4. RESULTS & DISCUSSION……………………... 22
4.1 UV & PL Spectra of Organic Materials……………... 22
4.2 Carrier Mobility………………………………………... 23
4.3 OLEDs with Mixed Layer Technology…………………... 25
4.4 Recovery Behavior of Mixed Layer OLEDs…………... 32
4.5 References………………………………………………... 35
CHAPTER 5. CONCLUSIONS……………………………….… 37
5.1 Summary and Conclusions……………………………….. 37
5.2 Publications………………………………………………. 38
APPENDIX A. BLUE MIXED HOST ORGANIC LIGHT
EMITTING DEVICE……………………………………………….… 39
APPENDIX B. THESIS BOARDS…………………....……….…… 47

Chapter1.
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Chapter3.
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Chapter4.
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