臺灣博碩士論文加值系統

於此篇論文中，我們使用共蒸鍍的技巧應用於藍光有機發光材料TBADN 以及黃色的染色有機材料Rubrene去製程我們期待的高效率以及高色穩定度的白光有機發光元件(WOLEDs)。在製作的同時我們也發現在藍光材料TBDAN 的發光頻譜以及Rubrene的吸收頻譜有相對高的重疊性，這也是在參雜過後的WOLED可以提高發光效率的主要原因首先我們嘗試最佳化藍光有機發光元件的結構，其結構依序如下ITO/NPB(70nm)/TBDAN(Xnm)/Alq3(10nm)/LiF(1nm)/Al(150nm) 接著我們調變發光層TBDAN的膜厚達到我們期待的高亮度以及高效率；在外加偏壓10伏可以達到2271 (cd/m2)而在6伏可以達到2.706(cd/A)的效率。接著我們選擇了最佳化的藍光有機發光元件的結構並在發光層TBADN用共蒸鍍的方式參雜染色材料，藉由增加Rubrene的濃度我們可以發現白光的發光效率、亮度、以及色穩定度變差甚至偏移、相對的也到至元件容易毀損於高電壓的操作。我們調變了在0.3%的參雜濃度下得到純度較高的白光；量測在4伏電壓下9.86 (cd/A) 的高效率、11伏外加電壓下13028 (cd/m2) 的高亮度、在偏壓8~11伏下CIE色度座標保持在(0.32,0.34)無偏移。 然而我們在0.7%的參雜濃度下量測到5伏電壓下11.836 (cd/A) 的更高的效率、11伏外加電壓下18250 (cd/m2) 更高的亮度、在偏壓8~11伏下CIE色度座標保持在(0.31,0.35)略偏黃的白光。

In this thesis, we use the co-vaporizing skills in blue organic material TBADN and yellow dyeing organic material Rubrene to achieve high efficiency and color stability white organic light emitting devices (WOLEDs). We also discover high overlapping between emitting photoluminescence of TBDAN and absorption of photoluminescence of Rubrene. That is one of the major reasons to increase the efficiency of WOLEDs.
At first, we try to optimize the best blue light emitting device structure whose layer in order as ITO/NPB(70nm)/TBDAN(Xnm)/Alq3(10nm)/LiF(1nm)/Al(150nm), and modulate the depth of emitting layer X to obtain the highest luminescence and efficiency which are 2271(cd/m2) at 10 applied voltage and 2.706 (cd/A) at 6 applied voltage.Second, we choose the optimal blue light emitting device structure to dope dyeing material in emitting layer, layer of TBADN. By the increasing of concentration on Rubrene, we also find the decline of the efficiency and luminescence, color shift from white light regions of the CIE coordinate, and easily burned out by high applied voltage. We tune concentration of Rubrene around 0.3% in pure white light emission to acquire efficiency 9.86 (cd/A) at 4 applied voltage, brightness 13028 (cd/m2) at 11 applied voltage, and the most important is that CIE coordinate still remain (0.32, 0.34) at applied voltage from 8 to 11. We also find concentration of Rubrene around 0.7% that obtain higher efficiency11.836 (cd/A) at 5 applied voltage, higher brightness 18250 (cd/m2) at 11 applied voltage than those in 0.3% dopant, but not very pure white light that CIE coordinate is about (0.31, 0.35).

Abstract (Chinese)
Abstract (English)
Table Captions
Figure Captions
Chapter 1 Introduction 1
Chapter 2 Organic Light-Emitting Device 3
2-1 The Organic Light-emitting Theorems 3
2-2 Mechanism of producing light emission 5
2-3 Measurements of light emission 8
2-4 Materials of anode and cathode 10
2-5 Design of Organic Light-emitting Device 11
2-6 Blue Organic Light-emitting Device 12
2-7 White Organic Light-emitting Device 12
Chapter 3 Fabrication of Organic Light-Emitting Device 14
Device Fabrication Process 14
3-1 Pre-clean ITO Glass 14
3-2 ITO Pattern Etching 15
3-3 UV Ozone Treatment 15
3-4 Thermal organic vaporizing 16
Chapter 4 Experimental Results 17
4-1 Device Structure 17
4-2 Modulate TBDAN Depth (X nm) 17
4-3 Modulate Concentration of Rubrene in TBADN
Layer (X=30nm) 20
Chapter 5 Conclusion 23
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