| 研究生: |
李育豪 Lee, Yu-Hao |
|---|---|
| 論文名稱: |
疊層式有機多層膜白光二極體 Tandem type organic multi-layers white light emissive diodes |
| 指導教授: |
黃榮俊
Huang, J. C. A. 郭宗枋 Guo, Tzung-Fang |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 光電科學與工程研究所 Institute of Electro-Optical Science and Engineering |
| 論文出版年: | 2009 |
| 畢業學年度: | 97 |
| 語文別: | 中文 |
| 論文頁數: | 105 |
| 中文關鍵詞: | 電荷產生層 、疊層式元件 、連接層 、白光元件 、有機發光二極體 |
| 外文關鍵詞: | charge generation layer, connecting layer, OLED, tandem, stacking |
| 相關次數: | 點閱:91 下載:2 |
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於本論文研究方向分成兩個主軸同時進行,第一是研究紅、綠、藍三色所合成的超亮度純白光元件,第二是專注在疊層式元件連接單原材料與接面討論;白光策略採用多層膜堆疊的方式達成紅、綠、藍全光譜的放光,利用厚度調整三色的發光強度控制光色。連接單元利用Polyethylene oxide(PEO):Al(1:2)所形成的複合式材料製作n-type層與利用N,N’-bis-(1-naphthyl)-N,N’ -diphenyl-1 ,1’-biphenyl 4,4’- diamine(NPB)與Tetrafluorotetracyanoquinodimethane (F4-TCNQ)所造成的charge transfer complex現象製作p-type層取代金屬氧化物。
串聯式白光元件效能可以在驅動電壓為7.2伏特、效率為10.5 Cd/A、CIE座標為(0.33, 0.35)的純白光區、亮度達10373 Cd/m2與演色性指數為76。
在p-n接面上如果加入奈米銀薄膜,可以在元件穩定運作的情況下再把驅動電壓下降7伏特,比理論值(單層元件加倍(4.5X2))表現更佳,連接單元的運作機制以及奈米金屬所扮演的角色成為了我們研究的焦點,我們暫時解釋奈米金屬的功能為“主要載子交換區域(major carriers exchange center)”。
This investigation divides into two directions which is fabricating pure white tandem type organic light emitting diodes and researching the mechanism of connecting unit (charge generation unit(CGU)). The performance of stacking devices have low turn-on voltage (7.2V), high current efficiency (~10.5Cd/A), maximum brightness is 10373Cd, CIE coordinates and color rendering index(CRI) are on pure white position (0.33, 0.35) and 76, respectively.
N-type layer of connecting unit is the composite material of polyethylene oxide (PEO):Al(1:2). We employed all-organic materials instead of any metal oxide being a p-type layer because there will be a great loss of energy from metal oxide in CGU. To use charge transfer complex effect in p-type layer, we have selected the hole transport material N,N’-bis- (1-naphthyl) -N,N’-diphenyl-1,1’-biphenyl4,4’-diamine (NPB) and the high electron affinity material Tetrafluorotetracya noquino -dimethane(F4-TCNQ). If we insert 1 nm silver into p-n junction of CGU, the turn on voltage decreases over 7 volts (15.2V7.2V) and the device could still be work very stable.
In tandem type device, we called the thin film silver insert region between p-n junction of CGU as “major carriers exchange center”. So far the mechanism is still unclear, but it improves the charge balance and increase the device performance obviously.
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