有機發光二極體（Organic Light-Emitting Diode，簡稱OLED）的研究，目前已達到實用與量產的階段，並成功大量使用於平面顯示器，如手機面板及MP3播放器面板等。因OLED具自發光、製程簡單、成本相對較低的特性，若是使其發出偏極化光，將可直接應用在液晶顯示器當作背光源，取代目前之液晶顯示器背光模組，再者，由於欲減少環境光的反射，在面板表面需貼一偏振片，以提高面板的對比，可發極化光的OLED，可大幅提高面板亮度，具有很大的商業價值。
　　目前已有諸多相關文獻報導指出，若是能夠排列有機發光材料，即可製作出發極化光之元件，在發光層與陽極（或電洞傳輸層）間加入一配向層，將配向層經過適當的配向處理，即可排列有機發光分子（小分子與高分子），進而發出偏極化光。
　　本論文以使用在液晶顯示器之配向技術為基礎，應用在有機發光二極體，使其可發出偏極化光。研究重點為利用離子束轟擊製作配向層，排列有機發光分子DB-PPV，並進而發出偏極化光，實驗所得之偏振比數據為2.7：1，使用藍色材料4,4’-Bis[2-9(-ethyl-3-carbazoyl)vinylenyl]-1,1’- biphenyl（BECVB）則可做出偏振比3.1：1，元件為1.9：1，並從量測數據探討研究相關配向機制。

　Organic light emitting diodes have been successfully applied to displays such as mobile phones and MP3 players. They have the advantages of low power consumption and simple fabrication process. The devices with oriented light emitting molecules could irradiate polarized emission, which can act as the backlight module for liquid crystal displays in commercial application.
　We first demonstrated that an organic electroluminescence (EL) device based on conjugated polymers, which emitted polarized light, aligned by ion beam processed films of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). Homogenous alignment of 4,4’-Bis[2-9(-ethyl-3-carbazoyl)vinylenyl]-1,1’-biphenyl (BECVB) and DB-PPV films on thin layers of ion-beam-processed or rubbed PEDOT:PSS allows the construction of light-emitting diodes that emit polarized blue light (em = 455 nm) and green light (em = 515 nm), respectively. The ion-beam-processed or rubbed PEDOT:PSS acts as an effective hole-injecting alignment layer. Polarized photoluminescence spectra demonstrated that the long axis of BECVB molecule was oriented along the ion-beam or rubbing direction. Owing to the orientation of BECVB molecules, polarized EL in the rubbing or ion-beam direction was observed in the device. The maximum photoluminescence and electroluminescence polarization ratios of 2.7: 1 and 5.4:1were achieved for the devices aligned by ion-beam and rubbing methods, respectively.

1.資料來源 市調研究公司 Isuppli Corp , Aug. 2004.
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