Particle Size Effect of the Alq3 Target Source on OLED Efficiency

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謝宥晟(Yu-Cheng Hsieh) 查詢紙本館藏

畢業系所

化學工程與材料工程學系

論文名稱

(Particle Size Effect of the Alq3 Target Source on OLED Efficiency)

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摘要(中)

本研究探討製程上蒸鍍源的顆粒大小與OLED光電的特性。超音波震盪過後的Alq3粉末粒徑小於市售的Alq3粉末，超音波震盪後的Alq3粉末堆疊緻密，熱傳導效果比較好，由超音波震盪後Alq3所構成的蒸鍍源其溫度相對於市售的Alq3所構成的蒸鍍源較高以及較恆溫。促進較高溫度梯度的蒸鍍製程，提升擴散通量，使氣體Alq3在基板上形成動力驅動的沉積模式，沉積出較小的微晶薄膜，提升元件的電子傳輸性。因為在此系統的固定膜厚下，較小的微晶薄膜阻擋電子能力下降，降低載子的結合率，其元件的電流效率較低。在10000 cd/m2亮度下為例，以超音波震盪後Alq3所構成的蒸鍍源製備出的單元件，其電流密度為0.23 A/cm2，而電流效率為4.55 cd/A，而以市售的Alq3蒸鍍源製備出的單元件，其電流密度為0.09 A/cm2，而電流效率為5.57 cd/A。掌握蒸鍍源粉末的大小分布與粉末間隙，即控制蒸鍍源粉末的熱傳導性，將更準確地控制在薄膜上元件的再現性，以及提升元件電子傳輸性。

摘要(英)

The relationship between the particle size of the target source and the photoelectric characteristic of organic light-emitting diode (OLED) was investigated in this thesis. The insonated Alq3 particulates were smaller than the as-received Alq3 particulates. The insonated Alq3 particulates were compacted with a better connectivity which related to heat conduction. With better heat conduction, the Alq3 vapor was deposited on a substrate with a kinetically driven growth mechanism. Smaller crystallites were resulted in the thin film which gave a highly electronic transportation, leading to an increased current density. Because of the given thickness and the drop of the electronic blocking ability, the recombination probability of carriers by the smaller crystallite size in the thin film could not be enhanced. The insonated Alq3 produced device exhibited, at 10000 cd/m2, for example, the current density of 0.23 A/cm2 and the current efficiency of 4.55 cd/A, whereas the as-received Alq3 produced device displayed 0.09 A/cm2 and 5.57 cd/A, respectively. This suggested that the target source with compacted connection accompanied the improvement of the electronic transmission and the reproducibility of OLEDs for thermal evaporation process.

關鍵字(中)

★ 有機發光二極體
★ Alq3
★ 蒸鍍源

關鍵字(英)

論文目次

摘要 i
Abstract ii
Acknowledgement iii
List of Figures vii
List of Tables ix
Chapter 1 Executive Summary 1
1.1 Introduction 1
1.2 Brief Introduction of Alq3 4
1.3 Conceptual Framework 5
1.4 References 7
Chapter 2 Analytical Instruments 10
2.1 Introduction 10
2.2 Microscopic Methods 12
2.2.1 Field Emission Scanning Electron Microscopy (FE-SEM) 12
2.3 Spectroscopy Methods 15
2.3.1 Fourier Transform Infrared (FT-IR) Spectroscopy 15
2.4 Crystallographic Analysis Methods 17
2.4.1 Powder X-ray Diffraction (PXRD) 17
2.4.2 Grazing Incidence Wide Angle X-ray Scattering (GIWAXS) 22
2.5 Color and Luminescence Meter and Source Measure Unit Instrument 24
2.6 References 27
Chapter 3 Particle Size Effect of the Alq3 Target source on OLED Efficiency 29
3.1 Introduction 29
3.2 Materials 33
3.2.1 Chemicals 33
3.2.2 N,N’-bis(1-naphthyl)-N,N’-diphenyl-1,1’-biphenyl-4,4’-diamine (NPB) 36
3.2.3 Lithium Fluoride (LiF) 36
3.2.4 ITO Substrate 37
3.3 Experimental Procedures 38
3.3.1 Sonication for Alq3 38
3.3.2 Device Fabrication 39
3.4 Instrumental Analysis 41
3.4.1 Fourier Transform Infrared Spectroscopy (FT-IR) 41
3.4.2 Powder X-ray Diffractometry (PXRD) 41
3.4.3 Field Emission Scanning Electron Microscopy (FESEM) 41
3.4.4 Grazing Incidence Wide Angle X-ray Scattering (GIWAXS) 42
3.4.5 Source Measure Unit Instrument and Color and Luminescence Meter 42
3.5 Results and Discussion 43
3.6 Conclusions 52
3.7 References 53
Chapter 4 Conclusions and Future Works 59
Appendix 61

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指導教授

李度

審核日期

2013-7-18

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