過濾製程及熱處理對MEH-PPV有機發光二極體光電特性的影響

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梁義忠(Yi-Chung Liang) 查詢紙本館藏

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論文名稱

過濾製程及熱處理對MEH-PPV有機發光二極體光電特性的影響
(Effects of Filtration Process and Thermal Treatment on Optoelectronic Characteristics of MEH-PPV Polymer Light-Emitting Diodes)

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摘要(中)

摘?要
現今顯示器技術蓬勃發展，可應用於次世代顯示面版的有機發光二極體（OLED）已成為最具發展潛力的項目之一。其中高分子發光二極體（PLED）更具有製程簡單，成本低等優點。與小分子發光二極體比較，高分子發光二極體目前有操作電壓較高，發光效率較低，電極介面較差等問題。
本研究的主要目的是利用熱處理的方法來改善高分子發光二極體的缺點，並且探討未過濾的高分子材料溶液對元件發光效率的影響。實驗結果顯示，無論高分子發光二極體製作在玻璃基板或塑膠基板上，適當的熱處理確實可降低元件操作電壓，提高其發光效率，大幅改善元件的光電特性。另外，在元件製程中如使用未過濾高分子材料溶液可增加電子電洞的復合率，當外加電壓上升至一臨界電壓時，發現元件亮度有突然增加的現象。
利用適當的製程及熱處理方法，在玻璃基板上可獲得最佳的元件亮度高達436,000 cd/m2，其頻譜峰值為592 nm，電激光臨界電壓為6.4 V；在塑膠基板上最佳的元件亮度可達43,600 cd/m2，電激光臨界電壓為8.5 V，可忍受的曲率半徑達2 cm。

摘要(英)

Abstract
Since the thermal treatment (or annealing) is an important technique to control the morphology of poly(2-methoxy-5-(2’ethylhexoxy)-1, 4-phenylene-vinylene) (MEH-PPV) film, it has been employed in this study to improve the performances of MEH-PPV-based PLEDs fabricated on the glass or plastic substrate. The optimal thermal treatment condition could reduce the electroluminescence (EL) threshold voltage and enhance the brightness of a PLED. Also, the unfiltered powders of dissolved MEH-PPV played an important role affecting the device performance. They would confine the carriers and hence the recombination rate of electron-hole pairs could be enhanced. With the proper filtration process and thermal treatment condition, the device obtainable on glass substrate had a brightness (luminance efficiency) of 436,000 cd/m2 (130 cd/A) at an injection current density of 355 mA/cm2, and an EL threshold voltage of 6.4 V. Also, the device obtainable on plastic substrate had a brightness (luminance efficiency) of 43,600 cd/m2 (7.11 cd/A) at an injection current density of 600 mA/cm2, and an EL threshold voltage of 8.5 V.

關鍵字(中)

★ 有機發光二極體
★ 熱處理
★ 未過濾
★ 高分子材料
★ 玻璃基板
★ 塑膠基板

關鍵字(英)

★ PLED
★ polymer
★ polymer material
★ MEH-PPV
★ thermal treatment
★ filtration process
★ glass substrate
★ plastic substrate

論文目次

Chapter 1 INTRODUCTION…………………………………………………………………………1
Chapter 2 EXPERIMENTAL PROCEDURES……………………………………………………………5
2.1 Preparation of conjugated polymer………………………………………………5
2.1.1 Characteristics of MEH-PPV………………………………………………………5
2.1.2 Selection of solvent………………………………………………………………7
2.1.3 Preparation of MEH-PPV solution…………………………………………………8
2.2 Selection of plastic substrate…………………………………………………8
2.3 Spin-coating System…………………………………………………………………9
2.4 Thermal evaporation system………………………………………………………12
2.5 Radio-frequency sputtering system……………………………………………12
2.6 Device synopsis……………………………………………………………………14
2.7 Device fabrications………………………………………………………………14
2.7.1 PLEDs on ITO-coated glass substrate…………………………………………14
2.7.2 PLEDs on plastic substrate………………………………………………………15
2.8 Measurement techniques……………………………………………………………16
2.8.1 Sheet resistance……………………………………………………………………16
2.8.2 Optical band-gap of conjugated polymer film………………………………17
2.8.3 EL intensity and brightness……………………………………………………21
2.8.4 EL spectrum…………………………………………………………………………21
2.8.5 FTIR spectrum.………………………………………………………………………21
Chapter 3 RESULTS AND DISCUSSION……………………………………………………………24
3.1 Thickness variation with different spin speeds……………………………24
3.2 Thermal treatment of PLEDs on glass…………………………………………28
3.2.1 Effects of annealing temperature………………………………………………28
3.2.2 Effects of annealing time………………………………………………………32
3.2.3 Effects of different thermal treatment processes…………………………32
3.2.4 FTIR spectrum………………………………………………………………………45
3.2.5 EL and PL spectra…………………………………………………………………45
3.2.6 Comparison of different concentrations………………………………………53
3.3 Thermal treatment of PLEDs on PET substrate………………………………53
3.3.1 Effect of thermal treatment on sheet resistance of ITO film…………53
3.3.2 Effects of annealing temperature………………………………………………56
3.4 Current-conduction mechanism……………………………………………………61
3.4.1 Ideality factor……………………………………………………………………61
3.4.2 Low electric-field region………………………………………………………61
3.4.3 High electric-field region………………………………………………………62
Chapter 4 CONCLUSION……………………………………………………………………………65
REFERENCES………………………………………………………………………………………67

參考文獻

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指導教授

洪志旺(Jyh-Wong Hong)

審核日期

2006-6-29

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