臺灣博碩士論文加值系統

我們利用兩種客體材料來分別製作出白光OLED，並且比較白光的穩定性。這兩種材料分別是紅色客體DCJTB與黃色客體Rubrene。我們發現以2.5 wt% Rubrene摻雜Alq3，元件工作時之白光CIE座標相當的穩定；當電壓從9 V增加到14 V時，CIE座標都維持在(0.36, 0.36)。利用能量轉換的機制，使客體Rubrene的能量經由主體Alq3而被激發出來，並且結合TBADN的藍光，達到全波長的白光OLED。這白光OLED元件的結構為: ITO/ NPB (45 nm)/TBADN (30 nm)/Alq3:Rubrene(30 nm, 2.5 wt%)/Al (200 nm)。在電壓為14 V時，亮度是3150 cd/m2, 電流密度為153 mA/cm2。

The white organic light emitting diodes (OLEDs) were fabricated by utilize two kinds of guest materials as emitters. The luminescence stability between white OLEDs was compared and discussed. The guest materials were red DCJTB emitter and yellow Rubrene emitter. We found that when Alq3 was doped with 2.5 wt% of Rubrene, the CIE coordinate of white OLED was considerably stable; when the applied voltage was increased from 9 to 14 V, the CIE coordinates all kept at (0.36, 0.36). Utilizing the energy transfer mechanism, the Rubrene guest gained exciting energy from Alq3 host and emitted subsequently; combining with blue TBADN emissions, the whole wavelength of white OLED was achieved. The structure of the white OLED device was ITO/NPB (45 nm)/TBADN (30 nm)/Alq3:Rubrene(30 nm, 2.5 wt%)/Al (200 nm). At applied voltage of 14 V, the luminance and current density were 3150 cd/m2 and 153 mA/cm2, respectively.

Abstract (in Chinese) IV
Abstract (in English) V
Acknowledgement VII
Content VIII
Table Captions X
Figure Captions XI
Chapter 1 1
Introduction 1
1-1 The backgrounds of OLED 1
1-2 The advantages of OLED 2
1-3 Application of the OLED 3
Chapter 2 4
Electroluminescence principle and device structure 4
2-1 Principle of electroluminescence (EL) 4
2-1-1 Principle of light emission 4
2-1-2 Energy transfer 5
2-2 Structure of the device 8
2-2-1 Multi-layer structure 8
2-2-2 Microcavity structure 8
2-2-3 Microlens structure 10
2-2-4 White OLED structure 12
Chapter 3 13
Experiments and measurement system configuration 13
3-1 Use of organic material and electrode 13
3-1-1 Holes transport layer 13
3-1-2 Electron transport layer 14
3-1-3 Organic emission layer 14
3-1-4 The anode material 16
3-1-5 The cathode material 16
3-2 Fabrication processes of the devices 17
3-3 Measure the system 20
3-4 Efficiency calculation 20
Chapter 4 22
Results and discussion 22
4-1 Characteristics of DCJTB doped into different host emitters 22
4-1-1 The undoped DCJTB emission layer 22
4-1-2 The DCJTB doped Alq3 emission layer 25
4-1-3 The DCJTB doped TBADN emission layer 29
4-1-4 The DCJTB doped NPB emission layer 33
4-2 Characteristics of Rubrene doped into different host emitters 37
4-2-1 The undoped Rubrene emission layer 38
4-2-2 The Rubrene doped NPB emission layer 40
4-2-3 The Rubrene doped TBADN emission layer 44
4-2-4 The Rubrene doped Alq3 emission layer 48
4-3 Compare DCJTB with Rubrene characteristic of the devices 52
Chapter 5 53
Conclusion 53
References 55
Publication list 61

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