https://scholars.lib.ntu.edu.tw/handle/123456789/119639
標題: | 微顆粒散射膜對有機發光元件光學特性影響之研究 Influences of Micro-Particle Diffuser Films on Optical Characteristics of Organic Light-Emitting Devices |
作者: | 張智凱 Chang, Chih-Kai |
關鍵字: | 有機發光元件;微顆粒散射膜;散射;出光耦合因子;電激發光效率;OLED;micro-particle diffuser film;scattering;out-coupling factor;EL efficiency | 公開日期: | 2007 | 摘要: | 有機發光元件不僅能作為平面顯示器的應用也可作為平面照明光源。在照明的用途中,電至光的轉換效率是其中一個重要的評斷標準。 本研究使用微顆粒散射膜,設法改善有機發光元件的出光耦合率,藉此提高電至光的轉換效率,並檢視微顆粒散射膜對有機發光元件光學特性的影響。低成本、製作簡單、不破壞元件電特性是使用微顆粒散射層主要的優勢。 在藍光與紅光的雙色光混色型白光有機發光元件中,使用不同濃度及厚度微顆粒散射膜,最佳的結果為外部量子效率增加了20%、正向cd/A增進了約22.6%、lm/W增進了約22.4%,與光學模擬預測的結果相較,趨勢一致。在元件的電激發光頻譜方面,使用微顆粒散射膜,具有不同視角下,色偏減少的優點。 Organic light emitting devices (OLED) have attracted wide interest due to their applications not only for flat panel displays but also for solid-state lighting. In lighting purposes, the electricity- to-light conversion ratio is one of the critical criteria. In our study, we use micro-particle diffuser films to improve the light out-coupling efficiency of OLEDs. Simple fabrication, low cost, and not affecting the electrical properties of OLEDs are the major superiority. Furthermore, we examine optical characteristics of OLEDs using micro-particle diffusers. In the two-component white OLEDs(blue+red), by adjusting different concentrations and thicknesses of micro-particle diffuser films, the external quantum efficiency can be enhanced by about 20%, the forward viewing cd/A can be enhanced by about 22.6%, and the lm/W can be enhanced by about 22.4%. The optical simulation results are qualitatively consistent with experimental results. In aspect to electroluminescent spectrum of OLED, after laminating with micro-particle diffuser films, it has the advantage of decreasing color shift for different viewing angles. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/50704 | 其他識別: | zh-TW |
顯示於: | 光電工程學研究所 |
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ntu-96-R94941001-1.pdf | 23.31 kB | Adobe PDF | 檢視/開啟 |
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